Research Article |
Corresponding author: Christian Feuillet ( feuillec@si.edu ) Academic editor: Sandy Knapp
© 2016 Christian Feuillet.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Feuillet C (2016) Two new combinations in Euploca Nutt. (Heliotropiaceae, Boraginales) and a conspectus of the species of the Guiana Shield area. PhytoKeys 61: 101-124. https://doi.org/10.3897/phytokeys.61.6260
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Heliotropium foliatum and Tournefortia humilis are transferred to Euploca Nutt. respectively as Euploca foliata comb. n. and Euploca humilis comb. n. A collection from Guyana has been recently identified as Euploca humistrata, a species previously considered a Brazilian endemic. A collection from French Guiana documents for the first time the species in that country. A key to the species of the Guiana Shield area is given. The species of Euploca from the Guiana Shield are listed with synonymy and a brief description: E. filiformis, E. humilis, E. humistrata, E. lagoensis, E. polyphylla, E. procumbens.
Boraginales , Brazil, Euploca , Guiana Shield, Guianas, Heliotropiaceae , Venezuela
The genus Euploca
I studied the literature and type specimens. In the citation of types, “photo” refers to a print deposited in herbaria and “scan” refers to a picture posted online, available directly through herbarium sites, or sites like JSTOR or Europeana.
For the purpose of this paper, the Guiana Shield area is defined as the Venezuelan Guayana, the Guianas (Guyana, Surinam and French Guiana), and the part of Brazil north of the Amazon River and east of the Rio Negro.
Euploca Nutt., Trans. Amer. Phil. Soc., ser. 2, 5: 189. 1836.
Heliotropium [unranked] Orthostachys R.Br., Prodr.: 493. 1810.
Type species. Heliotropium foliatum R.Br. (lectotype designated by
Preslaea Mart., Nov. Gen. Sp. 2: 75, t. 164. 1827; non Preslia
Type species. Preslaea paradoxa Mart. [= Euploca paradoxa (Mart.) J.I.M.Melo & Semir].
Orthostachys (R.Br.) Spach, Hist. Nat. Vég. 9: 32. 1838. [“1840” see
Type species. Based on Heliotropium [unranked] Orthostachys R.Br.
Heliotropium sect. Orthostachys (R.Br.) G.Don, Gen. Syst. 4: 361. 1838.
Type species. Based on Heliotropium [unranked] Orthostachys R.Br.
Schleidenia Endl., Gen. Pl. 646. 1839.
Type species. Based on Preslaea Mart.
Heliotropium subgen. Orthostachys (R.Br.) Rchb., Deut. Bot. Herb.-Buch: 112. 1841.
Type species. Based on Heliotropium [unranked] Orthostachys R.Br.
Heliotropium sect. Euploca (Nutt.) A.Gray, Proc. Amer. Acad. Arts 10: 49. 1874.
Type species. Based on Euploca Nutt.
Heliotropium sect. Orthostachys subsect. Axillaria I.M.Johnst., Contr. Gray Herb. 81: 47. 1928.
Type species. Heliotropium paradoxum (Mart.) Gürke, in Engl. and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893; non
Heliotropium sect. Orthostachys subsect. Bracteata I.M.Johnst., Contr. Gray Herb. 81: 47. 1928.
Type species. Heliotropium bracteatum R.Br., Prodr.: 493. 1810.
Heliotropium sect. Orthostachys subsect. Ebracteata I.M.Johnst., Contr. Gray Herb. 81: 47. 1928.
Type species. Heliotropium procumbens Mill., Gard. dict.. ed. 8: 10. 1768; non
Hilgeria Förther, Sendtnera 5: 132. 1998.
Type species. Hilgeria hypogaea (Urb. & Ekman 1929: 105) Förther [= Euploca hypogaea (Urb. & Ekman) Diane & Hilger].
Euploca convolvulacea Nutt.
Herbs or subshrubs. Leaves alternate, simple, entire. Trichomes on a pedestal of distinctly enlarged foliar epidermis cells. Inflorescences of single, scorpioid cymes, or flowers solitary. Flowers perfect; calyx 5–toothed or 5–lobed, persistent; corolla white, small, 5–merous, lobe’s margin involute; stamens 5, included; nectar disc at the base of the ovary; ovary functionally 4–locular, locules 1-seeded, style terminal, undivided, or absent, the stigma cryptically or clearly apically 2- or 4-fid. Fruit a schizocarp, lobed or unlobed, dry, 2–4 bony 1-seeded nutlets, embryos curved.
North America to Argentina, Africa, Arabian Peninsula to Indochina, Australia.
Heliotropium foliatum R.Br., Prodr.: 493. 1810.
Type. Australia. Northern Territory: Carpentaria mainland opposite Grote Eyland, 4 Jan 1803, R. Brown 2932 (lectotype, designated by
Based on Heliotropium foliatum R.Br.
When they resurrected Euploca,
Tournefortia humilis L., Sp. Pl.: 141. 1753.
Type. “Tournefortia foliis lanceolatis” pl. by Plumier, in Burman, Pl. Amer., 224, t. 227, f. 2. 1760 (lectotype designated by Miller in
Based on Tournefortia humilis L.
When
Because the name T. humilis L. or/and H. humile (L.) R.Br. ex Roem. & Schult. (1819, 4: 37; non Lam., 1791: 393) have been used in synonymy (
The last treatment of Heliotropium (including Euploca) for the Guianas (
1 | Flowers solitary; pedicels 1–3 mm long; corolla white and yellow | 2 |
– | Inflorescences 1–18 cm long; flowers sessile or sub-sessile, or pedicels obvious; corolla white or yellow | 3 |
2 | Stem glabrous or puberulent; leaf blades glabrous or puberulent; corolla white, yellow at throat, lobes elliptic | E. lagoensis |
– | Stem villose; leaf blades with long, stiff trichomes; corolla tube yellow, lobes white, ovate | E. humistrata |
3 | Petiole 4–15 mm long; raceme mostly geminate or ternate, ebracteate; stigma sessile, base as wide as the apex of the ovary, forming together a blunt cone | E. procumbens |
– | Petiole 0.3–2 mm long; raceme single or paired, bracteate; stigma morphologically clearly separate from the ovary, looking together like a mushroom or like a head with a hat or with a clear style | 4 |
4 | Leaf blade Inflorescences always single; bract filiform to narrowly elliptic; calyx length greater than or less than half the corolla tube; corolla white; style 0.3–0.5 mm long | 5 |
– | Inflorescences usually single and paired on the same plant; bracts ovate; calyx nearly as long as the corolla tube; corolla yellow; style 0.5–1 mm long | E. polyphylla |
5 | Stem relatively coarse and stiff; leaves drying rather light colored; inflorescences up to 20 cm long, with 1–2 cm long peduncle; calyx shorter than half the corolla tube; corolla 4–6 mm long, salverform; anthers apically joined; stigma on a short style | E. humilis |
– | Stem wiry, very slender; leaves usually drying dark colored; inflorescences epedunculate, up to 10 cm long; calyx longer than the corolla tube; corolla 2–2.5 mm long, tube urceolate; anthers not joined at apex; stigma sessile | E. filiformis |
Euploca filiformis (Lehm.) J.I.M.Melo & Semir, Kew Bull. 64: 289. 2009.
Heliotropium filiforme Lehm., Gött. Gel. Anz. 3(152): 1515. 1817.
Type. Venezuela. Near Orinoco, Bonpland and Humboldt 1202 [an error, most likely for 1203] (lectotype, designated by
Heliotropium filiforme Kunth, Nov. Gen. Sp. (quarto ed.) 3: 86, t. 204. 1818, nom. illeg. non H. filiforme Lehm. 1817.
Type. Venezuela. Near Orinoco, Bonpland and Humboldt 1203 (holotype P-Bonpl! [scan!]; isotypes B-Willd 3246/1 n.v. [scan!],
Heliotropium tenue Roem. & Schult., Syst. Veg. 4: 737. 1819.
Type. Brazil. Pará, Sieber for Hoffmannsegg s.n. (holotype B-WILLD-3248!; isotypes
Preslaea stenostachya A.St.-Hil., Voy. Distr. Diam. 2: 434. 1833.
Type. Brazil. “Ad ripas fluminis Parahyba”, St.-Hilaire B228 (lectotype, designated by
Heliotropium littorale Mart. ex Colla, Herb. Pedem. 4: 226. 1835.
Type. Brazil. “In arenosis maritimis”, Martius s.n. (holotype
Note. placed in the synonymy fide
Heliotropium pusillum Colla, Herb. Pedem. 4: 227. 1835.
Type. Brazil. Martius s.n. (holotype
Heliotropium helophilum Mart., Flora 21(2), Beibl. 4: 85. 1838.
Type. Brazil. “Propre Cujaba”, 1837, Herb. Fl. Bras. 165, n°267 (lectotype, designated by
Schleidenia stenostachya (A.St.-Hil.) DC., Prodr. 9: 558. 1845.
Type. Based on Preslaea stenostachya A.St.-Hil.
Schleidenia filiformis (Lehm.) Fresen., Fl. Bras. 8(1): 40. 1857.
Type. Based on Heliotropium filiforme Lehm.
Heliotropium stenostachyum (A.St.-Hil.) Gürke, in Engler and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893.
Type. Based on Preslaea stenostachya A.St.-Hil.
Based on Heliotropium filiforme Lehm.
Annual herb or subshrub, up to 0.25 m tall. Stems slender, erect or decumbent, up to 0.4 m long, sparingly strigose. Leaves: petiole 0.1–0.2 cm long, slender; lamina linear or elliptic or lanceolate or oblanceolate, 1–2.5 × 0.15–0.35 cm, apex acute, base acute, margin entire, both surfaces sericeous to strigose. Inflorescences epedunculate, slender scorpioid cymes, up to 15 cm long, bearing scattered bracts, filiform or subulate, 0.1–0.2 cm long, glabrescent. Flower sub–sessile: calyx longer than the corolla tube, lobes, 1.5–2 mm long at anthesis, glabrescent; corolla white, tubular, outside strigose, inside glabrescent, tube narrowed in the middle, lobes ovate with broadly open sinuses, about 1 mm long; stamens sessile, anther with an apical appendage, weakly coherent; ovary subglobose or globose, strigose; style lacking or nearly so; stigma sessile or sub–sessile, fertile base much wider than the apex of the ovary. Fruit on 0.5–1 mm long pedicel, depressed–globose; nutlets almost 1.5 mm long.
Venezuela (Amazonas, Bolívar), Guyana, Surinam, French Guiana, Brazil (Amapá, Amazonas, Pará, Roraima); also in Belize, Mexico, southeastern USA and from Trinidad to eastern Bolivia and Paraguay.
Guyana: Cuyuni River, Matope Falls, 4 June 1952, Forest Department 6940 (Fanshawe 3376) (K,
Tournefortia humilis L., Sp. Pl. 1: 141. 1753.
Type. “Tournefortia foliis lanceolatis” in Plumier in Burman, Pl. Amer., 224, t. 227, f. 2, 1760 [http://biodiversitylibrary.org/page/779658] (lectotype designated by Miller in
Heliotropium ternatum Vahl, Symb. Bot. 3:21. 1794.
Type. [Jamaica], “in India occidentali” (holotype C n.v. [scan!; microfiche 37: I, 3; photo
Heliotropium hirtum Lehm., Neue Schriften Naturf. Ges. Halle 3(2): 10. 1817.
Type. Venezuela. Cumana, Humboldt and Bonpland s.n. (lectotype, designated by
Heliotropium demissum Roem. & Schult., Syst. Veg. ed 15bis 4: 37. 1819.
Type. nom. illeg. renaming of Tournefortia humilis L.
Heliotropium humile (L.) R.Br. ex Roem. & Schult., Syst. Veg. ed 15bis 4: 37. 1819; non Lam. 1791.
Type. nom. illeg. in syn. of previous.
Heliotropium hispidum Kunth, Nov. Gen. Sp. (quarto ed.) 3: 87. 1818; illeg. not Lehm. 1817.
Type. Venezuela. near Cumana, Sep, Humboldt and Bonpland s.n. (holotype P-Bonpl! [scan!]; isotypes B-WILLD 3247!,
Pioctonon ternatum (Vahl) Raf., Sylva Tellur.: 88. 1838.
Type. Based on Heliotropium ternatum Vahl
Pioctonon antillanum Raf., Sylva Tellur. 88. 1838.
Type. nom. illeg. renaming of Tournefortia humilis L.
Tournefortia incana (G.Mey.) G.Don, Gen. Hist. 4: 368. 1838; non Lam. 1791.
Type. Based on Messerschmidia incana G.Mey.; nom. inval.
Tournefortia meyeri DC., Prodr. 9: 530. 1845.
Type. Renaming of Messerschmidia incana G. Mey.; nom. inval.
Heliotropium fruticosum var. ternatum (Vahl) DC., Prodr. 9: 542. 1845.
Type. Based on Heliotropium ternatum Vahl
Heliotropium oaxacanum DC., Prodr. 9: 543. 1845.
Type. Mexico. Oaxaca, Aug 1834, Andrieux 205 (holotype G-DC !; isotypes
Heliophytum passerinoides Klotzsch, in Rich. Schomburgk, Reis. Br.-Guiana 3: 1152. 1849 [“1848”]; nom. nud.
Type. Based on Guyana. Rupununi: May 1842, Schomburgk 573 (B†).
Schleidenia hispida (Kunth) Fresen., Fl. Bras. 8(1): 37. 1857.
Type. Based on Heliotropium hispidum Kunth
Schleidenia fumana Fresen., in Mart.: Fl. Bras. 8, 1: 40. 1857.
Syntype. Brazil. Minas Gerais, Vauthier s.n. (G n.v.). Type : Brazil. “ad Formigas et Ribeirao Catinga”, Pohl 565 (= 3081 bzw. distr. nr. 1588) (lectotype, designated by
Heliotropium fumana (Fresen.) Gürke, in Engler and Prantl: Nat. Pflanzenf. 4, Abt. 3a: 97. 1893.
Type. Based on Schleidenia fumana Fresen.
Heliotropium mexicanum Greenm., Proc. Amer. Acad. Arts 33(25): 484. 1898; illegitimate: not Sessé & Moç. 1888.
Syntypes: Mexico. Dugès s.n.; Pelmer 31, 98; L.C. Smith 209, 391; Alvarez 750; Pringle 6726. Type. Mexico. Iron Mtn, near Durando, June 1897, Palmer 141 (lectotype, designated by
Heliotropium strictissimum sensu N.E. Br. 1901; not A. DC. 1845.
Heliotropium ternatum var. fumana (Fresen.) I.M.Johnst., J. Arnold Arb. 16:62. 1935.
Type. Based on Schleidenia fumana Fresen.
Heliotropium greenmanii Wiggins, Contr. Dudley Herb. 4:22. 1950.
Type. Based on Heliotropium mexicanum Greenm.
Euploca ternata (Vahl) J.I.M.Melo & Semir, Kew Bull. 64: 289. 2009.
Type. Based on Heliotropium ternatum Vahl
Based on Tournefortia humilis L.
Suffrutescent herbs up to 30 cm tall; stems stiff, erect or decumbent, 10–50 cm long, with abundant, loosely appressed trichomes. Leaves: petiole subnul–2 mm long, thin; lamina lanceolate to linear, revolute, 0.5–3 × 0.1–0.8 cm, apex acute, base acute, margin +/- revolute, adaxially sericeous, abaxially tomentose, trichomes base very large and looking calcified. Inflorescences terminal or axillary, up to 20 cm long, stiff scorpioid cymes, single, peduncle 1–2 cm long, with scattered linear or narrowly elliptic bracts, 2–3 mm long, sericeous. Flower subsessile: pedicel 0.5–1 mm long, calyx 2–3 mm long, deeply lobed, lobes unequal, shorter than 1/2 the length of the corolla tube, becoming twice as large at maturity, sericeous in and out; corolla white, strigose outside, tube narrow, 2–2.7 mm long, throat yellow, lobes spreading, 1.3–2 mm long, ovate, sinuses rounded and plicate; stamens subsessile, anthers ovate with short, obtuse, hairy, apical long appendages which are apically joined; ovary globose, 0.3–0.4 mm diam., glabrous; style short but obvious, about 0.5 mm long; stigma about as large as the ovary, split at apex. Fruit depressed globose, 4–lobed, 1.5–1.8 mm diam., strigose or hirsute; nutlets 1–1.5 mm long.
Venezuela (Bolívar) and Guyana; also Central America, Mexico, and the West Indies Southward to southern Brazil.
Guyana: Potaro-Siparuni, Iwokrama, Kurupukari Falls, 4°40'N, 58°40'W, 100 m, 9 Dec 1994, Mutchnick 595 (
Euploca humistrata (Cham.) J.I.M.Melo & Semir, Kew Bull. 64(2): 288. 2009
Heliotropium humistratum Cham., Linnaea 4: 462. 1829.
Type [fide
Schleidenia humistrata (Cham.) Fresen., Fl. Bras. 8(1): 34. 1857.
Type: Based on Heliotropium humistratum Cham.
Based on Heliotropium humistratum Cham.
Prostrate herbs. Stems villose, trichomes hyaline, somewhat ferruginous around the nodes. Leaves: petiole short; lamina lanceolate, 0.5–0.8 × 0.15–0.2 cm, apex acute, base attenuate, margin entire, both surfaces villose. Inflorescence: solitary, supra-axillary flowers, on 1–1.5 mm long pedicel. Flowers: calyx as long as the corolla tube, lobes, 2.2–2.7 mm long at anthesis, puberulent on both sides; corolla tube yellow with white lobes, outside strigose, inside pubescent, tube more or less cylindric, lobes ovate with narrow sinuses, about 1 mm long; stamens sessile, anther with a small appendage; ovary ca. 0.3 mm diam., globose, glabrous; style lacking; stigma sessile, widely conical. Fruit on 1.2–2 mm long pedicel, subglobose, 1.5 mm diam., glabrous, rostrate; nutlets about 1.2 mm long.
Guyana; previously only known from a few localities outside the Guiana Shield, Brazil (Ceará, Goiás, Minas Gerais), Venezuela (Apure). In our area it is known only by GUYANA, Upper Takutu–Upper Essequibo, W of the Kanuku Mtns, savanna near Mountain Point, 27 Feb–5 Mar 1985, fl, C. Feuillet 1632 (
Euploca lagoensis (Warm.) Diane & Hilger, in Hilger and Diane: Bot. Jahrb. Syst. 125 (1): 48. 2003.
Schleidenia lagoensis Warm., Kjoeb. Vidensk. Meddel 1867: 15. 1868.
Type: Brazil. Minas Gerais: Lagoa Santa ad ripam lacus, 5 Nov 1864, Warming s.n. (holotype C n.v. [scan!; photos F-21971, M,
Schleidenia subracemosa Warm., Kjoeb. Vidensk. Meddel 1867: 15. 1868.
Type: Brazil. Minas Gerais: Lagoa Santa, 28 Jan 1866, Warming s.n. (holotype C [photo F-21972,
Heliotropium lagoense (Warm.) Gürke, in Engler and Prantl, Nat. Pflanzemf. 4(3a): 97. 1893.
Type: Based on Schleidenia lagoensis Warm.
Heliotropium trinitense Urb., Symb. Ant. 7(3): 350. 1912.
Type: Trinidad. in Piarco Savannah, 10 May 1895, Lunt 6030 (holotype B †; lectotype, designated by
Based on Schleidenia lagoensis Warm.
Annual herbs, up to 15 cm tall, stems decumbent or prostrate, up to 30 cm long, glabrous or with scattered slender appressed trichomes. Leaves: petiole about 1 mm long, glabrous; lamina oblanceolate, 0.5–1.5 × 0.1–0.3 cm, apex acute to acuminate, base attenuate, margin entire, ciliate, adaxially glabrous, abaxially glabrous to puberulent. Flowers single, extra–axillary on leafy stems: pedicel up to 3 mm long, calyx of 5 lanceolate or cuneate, unequal lobes, 1.5–2.5 mm long at anthesis, puberulent in and out; corolla white, yellow at throat, tube swollen at base, 3–4 mm long, puberulent in and out, lobes ovate, 1–1.5 mm long, with sinus rounded, occasionally plaited with a minute lobule; stamens sessile, inserted about 0.5 mm from base, anthers joined, oblong, with an hairy apical appendage nearly as large as the anther; ovary obpyriform, about 0.5 mm diam.; style lacking or confused with the apex of the ovary; stigma sessile or subsessile, much larger at base; fruit rostrate, glabrous or nearly so, about 2 mm diam., obpyriform; nutlets ca. 1.5–2 mm long.
Venezuela (Bolívar), Surinam, French Guiana, and Brazil (Amazonas); also Greater Antilles and from Mexico to Brazil and eastern Bolivia. Euploca lagoensis is new to French Guiana. I have seen only few specimens from the Guiana Shield.
Venezuela, Bolívar, near San Carlos, Laguna de la Culebra, 6 Apr 1925, fl, Pittier 11703 (P). Surinam, In 1885, W.F.R. Suringar s.n. (L); Mennega 907 (L). French Guiana, Savane Maillard, 6 km SE de Tonate-Macouria, 4°58'N, 52°26'W, 25 Nov 1999, Raynal-Roques and Jérémie 24694 (
Euploca polyphylla (Lehm.) J.I.M.Melo & Semir, Kew Bull. 64(2): 289. 2009.
Heliotropium polyphyllum Lehm., Neue Schriften Naturf. Ges. Halle 3(2): 9. 1817.
Type (fide
Heliotropium foliosum Roem. & Schult., Syst. Veg. 4: 737. 1819.
Type. Venezuela. Orinoco, Apr 1800, Humboldt and Bonpland 808 (holotype B-WILLD 3252-01 n.v.).
Preslaea linifolia A.St.-Hil., Voy. Distr. Diam. 2: 433. 1833.
Type. Brazil. Cabo Frio, St.-Hilaire 433 (lectotype, designated by
Heliotropium bahiense DC., Prodr. 9: 544. 1845.
Syntype: Brazil. Blanchet 92 (G n.v.,
Heliotropium polyphyllum var. blanchetii DC., Prodr. 9: 544. 1845.
Type. Brazil. Bahia, Serra Jacobina, 1837, Blanchet 2651 (lectotype, designated by
Schleidenia linifolia (A.St.-Hil.) DC., Prodr. 9: 558. 1845.
Type. Based on Preslaea linifolia A.St.-Hil.
Schleidenia pubescens Fresen., Fl. Bras. 8(1): 35. 1857.
Type. Brazil. Rio de Janeiro, Gaudichaud [524] (lectotype, designated by
Schleidenia polyphylla (Lehm.) Fresen., Fl. Bras. 8(1): 36. 1857.
Type. Based on Heliotropium polyphyllum Lehm.
Schleidenia polyphylla var. blanchetii (DC.) Fresen., Fl. Bras. 8(1): 36. 1857.
Type. Based on Heliotropium polyphyllum var. blanchetii DC.
Schleidenia bahiensis (DC.) Fresen., Fl. Bras. 8(1): 43. 1857.
Type. Based on Heliotropium bahiense DC.
Heliotropium polyphyllum var. laevenworthii A.Gray, Syn. Fl. N. Amer. 2(1): 185. 1878.
Syntypes: USA. Florida: Everglades, Leavenworth s.n.; Palmer s.n. (F). Type. USA. Florida: Everglades, 1877, Garber s.n. (lectotype, designated by
Heliotropium pubescens (Fresen.) Gürke, in Engler and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893.
Type. Based on Schleidenia pubescens Fresen.
Heliotropium linifolium (A.St.-Hil.) Gürke, in Engler and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893; illegitimate: not Lehm. 1818.
Type. Based on Preslaea linifolia A.St.-Hil.
Heliotropium laevenworthii (A.Gray) Small, Fl. S. E. U.S.: 1006. 1903.
Type. Based on Heliotropium polyphyllum var. laevenworthii A.Gray
Heliotropium horizontale Small, Bull. New York Bot. Gard. 3: 435. 1905.
Type. USA. Florida: 9–12 Nov 1903, Small and Carter 742 (holotype
Heliotropium polyphyllum var. horizontale (Small) R.W.Long, Rhodora 72: 33. 1970.
Type. Based on Heliotropium horizontale Small
Based on Heliotropium polyphyllum Lehm.
Herb or subshrub. Stems prostrate or decumbent, sericeous. Leaves alternate or subopposite: petiole 0.03–0.1 cm long, sericeous; lamina narrow lanceolate or oblanceolate, 0.6–1.3 × 0.1–0.2 cm, apex acute, base cuneate, margin entire, both surfaces sericeous. Inflorescences single or paired, cymose, 1–15 cm long, bracts ovate, 0.3–0.4 cm long, sericeous inside, glabrous outside. Flower sub–sessile: calyx slightly shorter than the corolla tube, lobes, 3–4 mm long at anthesis, glabrous inside, sericeous outside; corolla yellow or white, tubular, outside sericeous, inside sericeous at throat, tube widened in the middle, lobes ovate-deltoid, with narrow sinuses, 2.5–3 mm long; stamens subsessile, anther with a long appendage; ovary subglobose, 4-sulcate, glabrous; style 0.3–0.6 mm long; stigma conical. Fruit subglobose, entirely covered by the calyx; nutlets almost 1.5 mm diam.
Venezuela (Bolívar), Brazil (Amapá, Amazonas, Pará); also USA (Florida), Bahamas, Venezuela, eastern Brazil.
Euploca procumbens (Mill.) Diane & Hilger, in Hilger and Diane: Bot. Jahrb. Syst. 125 (1): 48. 2003.
Heliotropium procumbens Mill., Gard. Dict. ed. 8, Heliotropium n°10. 1768.
Type. Jamaica. herb. Miller (coll. Houston?) s.n. (lectotype, designated by
Heliotropium americanum Mill., Gard. Dict. ed. 8, Heliotropium n°11. 1768.
Type. Mexico. Vera Cruz, 1731, Houston s.n. (lectotype, designated by
Heliotropium inundatum Sw., Prodr. 40. 1788.
Type (fide
Heliotropium decumbens Lehm., Neue Schr. Naturf. Ges. Halle 3(2): 16. 1817.
Type. Venezuela. Sucre: Cumana, Humboldt and Bonpland 57 (lectotype, designated by
Heliotropium canescens Lehm., Pl. Asperif. Nucif. 38. 1818; illegitimate: not
Type. Brazil. Sieber pro Hoffmannsegg s.n. (holotype B-WILLD 3242 n.v.; isotypes
Heliotropium procumbens Kunth, Nov. Gen. Sp. (quarto ed.) 3: 88. 1818; nom. illeg. non Mill. 1768 + homotypic (different holo-) with H. decumbens Lehm. 1817.
Type. Venezuela. Sucre: Cumana, Humboldt and Bonpland 57 (holotype P-Bonpl!; isotypes
Heliotropium canescens Kunth, Nov. Gen. Sp. (quarto ed.) 3: 88. 1818; nom. illeg. non
Type. Venezuela. near Cumana, Humboldt 58 (holotype P!; isotype B-WILLD 3240/1!).
Heliotropium cinereum Kunth, Nov. Gen. Sp. (quarto ed.) 3: 89. 1818.
Type. Venezuela. [Apure:] bank of the Apures, propre Arichuna, Mar, Bonpland and Humboldt 1202 (holotype P-Bonpl.!; isotypes B-WILLD 3240/2!, F n.v., P! [2 sheets]). [Same type collection as H. humboldtianum below, but different holotype]
Heliotropium humboldtianum Roem. & Schult., Syst. Veg. 4: 737. 1819.
Type. Venezuela. [Apure:] bank of the Apures, propre Arichuna, Mar, Bonpland and Humboldt 1202 (lectotype, designated by
Heliotropium brasilianum Roth, Nov. Pl. Sp.: 103. 1821.
Type. Brazil. Mertens s.n. (holotype B † [photo F-17314,
Heliotropium riparium Mart. ex Colla, Herb. Pedem. 4: 226. 1835.
Type. Brazil. Rio Belmonte, Martius s.n. (holotype
Heliotropium willdenowii G. Don, Gen. Hist. 4: 359. 1838.
Type. A renaming of illegitimate Heliotropium canescens Lehm.
Heliotropium rigidulum DC., Prodr. 9: 543. 1845.
Type. Mexico. near Matamoros, July 1831, Berlandier pl. exs. 234 (holotype G-DC n.v.; isotypes
Heliotropium houstonii DC., Prodr. 9: 549. 1845; nom. illeg. renaming of H. procumbens Mill.
Type. Based on Heliotropium procumbens Mill.
Schleidenia elliptica Fresen., Fl. Bras. 8(1): 42. 1857.
Type. Brazil. Minas Gerais: near Salvado, Aug 1819, Martius s.n. (lectotype, designated by
Schleidenia longepetiolata Fresen., Fl. Bras. 8(1): 42. 1857.
Type. Brazil. Goyaz: Rio Maranhao, Pohl 2352 and 2384 (sic! distributed as 1593) (lectotype, designated by
Schleidenia inundata (Sw.) Fresen., Fl. Bras. 8(1): 43. 1857.
Type. Based on Heliotropium inundatum Sw.
Schleidenia leptostachya Fresen., Fl. Bras. 8(1): 43. 1857.
Syntype: Brazil. Bahia: Blanchet 3610 (G n.v.,
Heliotropium ellipticum (Fresen.) Gürke, in Engler and Prantl, Nat. Pflanzenfam.. 4(3a): 97. 1893.
Type. Based on Schleidenia elliptica Fresen.
Heliotropium leptostachyum (Fresen.) Gürke, in Engler and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893.
Type. Based on Schleidenia leptostachya Fresen.
Heliotropium longepetiolatum (Fresen.) Gürke, in Engler and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893.
Type. Based on Schleidenia longepetiolata Fresen.
Heliotropium bridgesii Rusby, Mem. Torrey Bot. Club 4: 224. 1895.
Type. Bolivia. Cochabamba, 1891, Bang 950 (holotype
Heliotropium riparium Chodat, Bull. Herb. Boiss., sér. 2, 2: 817. 1902; nom. illeg. non Mart. ex
Type. Paraguay. “ad ripam lacus Ypacaray”, Hassler 3893 (holotype G!; isotype P§
Based on Heliotropium procumbens Mill.
Annual herbs up to 50 cm long, usually cinereous; stems erect or decumbent, sericeous, trichomes appressed. Leaves: petiole slender, 0.4–2.4 cm long; lamina elliptic, obovate or broadly oblanceolate, 1–6 × 0.3–2 cm, apex acute, mucronate, base attenuate, margin entire, both surfaces sericeous. Inflorescences terminal or axillary, peduncle 1–3 cm long, slender scorpioid cymes, mostly geminate or ternate, bractless, up to 10 cm long, sericeous. Flower subsessile: calyx deeply lobed, lobes unequal, lanceolate to linear, about 2/3 as long as corolla tube; corolla white, tube 1–1.4 mm long, throat yellow, lobes spreading ovate with rounded sinus, < 0.5 mm long; stamens subsessile, anthers ovate with a small apical appendage, free; ovary about 0.3 mm diam., style lacking; stigma sessile forming with the ovary a blunt cone. Fruit: depressed-globose, 4-lobed, strigose; nutlets up to 1 mm long.
Venezuela (Amazonas, Bolívar, Delta Amacuro), Guyana, Brazil (Pará, Roraima); also West Indies and from Southern United States to Argentina.
Guyana. s.l., Appun 1762 (K); 1839, Rob. Schomburgk 1024 (K); Schomburgk 1026 (K); Upper Takutu-Upper Essequibo, NW Kanuku Mtns, near Nappi Village, 13 Feb 1993, Hoffman 3743 (
Messerschmidia incana G. Mey., Prim. Fl. Esseq. 92. 1818, nom. inval.
not designated; no original material found.
The only species known from the Guianas that would agree with Meyer’s description is E. humilis.
I want to thank the editor Sandy Knapp for her patience with my struggle with the format. I am indebted to the curators of the herbaria cited who made it easy to get loans, or to work in the collection in their care or who provided scans of types. I want to thank Ingrid Lin (
Euploca Nutt. 1836
Euploca convolvulacea Nutt. (type of Euploca)
Euploca filiformis (Lehm.) J.I.M.Melo & Semir 2009
Euploca foliata (R. Br.) Feuillet comb. nov.
Euploca humilis (L.) Feuillet, comb. nov.
Euploca humistrata (Cham.) J.I.M.Melo & Semir 2009
Euploca hypogaea (Urb. & Ekman) Diane & Hilger
Euploca lagoensis (Warm.) Diane & Hilger 2003
Euploca paradoxa (Mart.) J.I.M.Melo & Semir
Euploca polyphylla (Lehm.) J.I.M.Melo & Semir 2009
Euploca procumbens (Mill.) Diane & Hilger 2003
Euploca ternata (Vahl) J.I.M.Melo & Semir 2009 = Euploca humilis
Heliophytum passerinoides Klotzsch 1849 = Euploca humilis
Heliotropium subgen. Orthostachys (R.Br.) Rchb. 1841 = Euploca
Heliotropium sect. Orthostachys R.Br. 1810 = Euploca
Heliotropium sect. Orthostachys subsect. Axillaria I.M.Johnst. 1928 = Euploca
Heliotropium americanum Mill. 1768 = Euploca procumbens
Heliotropium bahiense DC. 1845 = Euploca polyphylla
Heliotropium brasilianum
Heliotropium bridgesii
Heliotropium canescens
Heliotropium canescens Lehm. 1818 = Euploca procumbens
Heliotropium cinereum
Heliotropium decumbens Lehm. 1817 = Euploca procumbens
Heliotropium ellipticum (Fresen.)
Heliotropium filiforme
Heliotropium filiforme Lehm. 1817 = Euploca filiformis
Heliotropium foliatum R.Br. 1810 (type of Heliotropium sect. Orthostachys (R.Br.) G.Don) = Euploca foliata
Heliotropium foliosum Roem. & Schult. 1819 = Euploca polyphylla
Heliotropium fruticosum var. ternatum (Vahl) DC. 1845 = Euploca humilis
Heliotropium fumana (Fresen.)
Heliotropium greenmanii
Heliotropium helophilum Mart. 1838 = Euploca filiformis
Heliotropium hirtum Lehm. 1817 = Euploca humilis
Heliotropium hispidum
Heliotropium horizontale Small, Bull. 1905 = Euploca polyphylla
Heliotropium houstonii DC. 1845 = Euploca procumbens
Heliotropium humboldtianum Roem. & Schult. 1819 = Euploca procumbens
Heliotropium humboltianum Roem. & Schult. 1819 = Euploca procumbens
Heliotropium humistratum Cham. 1829 = Euploca humistrata
Heliotropium inundatum Sw. 1788 = Euploca procumbens
Heliotropium laevenworthii (A. Gray)
Heliotropium lagoense (Warm.)
Heliotropium leptostachyum (Fresen.)
Heliotropium linifolium (A. St.-Hil.)
Heliotropium littorale Mart. ex
Heliotropium longepetiolatum (Fresen.)
Heliotropium mexicanum Greenm. 1898 = Euploca humilis
Heliotropium oaxacanum DC. 1845 = Euploca humilis
Heliotropium paradoxum (Mart.)
Heliotropium polyphyllum Lehm. 1817 = Euploca polyphylla
Heliotropium polyphyllum var. blanchetii DC. 1845 = Euploca polyphylla
Heliotropium polyphyllum var. horizontale (Small) R.W.
Heliotropium polyphyllum var. laevenworthii A.
Heliotropium procumbens
Heliotropium procumbens Mill. 1768 = Euploca procumbens
Heliotropium pubescens (Fresen.)
Heliotropium pusillum
Heliotropium rigidulum DC. 1845. = Euploca procumbens
Heliotropium riparium
Heliotropium riparium Mart. ex
Heliotropium sect. Euploca (Nutt.) A.
Heliotropium stenostachyum (A. St.-Hil.)
Heliotropium strictissimum sensu N.E. Br. 1901 = Euploca humilis
Heliotropium tenue Roem. & Schult. 1819 = Euploca filiformis
Heliotropium ternatum
Heliotropium ternatum var. fumana (Fresen.) I.M. Johnst. 1935 = Euploca humilis
Heliotropium trinitense Urb. 1912 = Euploca lagoensis
Heliotropium willdenowii G.
Hilgeria Förther 1989 = Euploca
Hilgeria hypogaea (Urb. & Ekman) Förther 1989 (type of Hilgeria Förther) = Euploca hypogaea
Messerschmidia incana G. Mey. 1818 = Euploca humilis
Orthostachys (R. Br.) Spach 1840 = Euploca
Pioctonon antillanum Raf. 1838 = Euploca humilis
Pioctonon ternatum (Vahl) Raf. 1838 = Euploca humilis
Preslaea Mart. 1827 = Euploca
Preslaea linifolia A. St.-Hil. 1833 = Euploca polyphylla
Preslaea paradoxa Mart. 1827 (type of Preslaea Mart.) = Euploca paradoxa
Preslaea stenostachya A. St.-Hil. 1833 = Euploca filiformis
Schleidenia Endl. 1839 = Euploca
Schleidenia bahiensis (DC.) Fresen. 1857 = Euploca polyphylla
Schleidenia elliptica Fresen. 1857 = Euploca procumbens
Schleidenia filiformis (Lehm.) Fresen. 1857 = Euploca filiformis
Schleidenia fumana Fresen. 1857 = Euploca humilis
Schleidenia hispida (Kunth) Fresen. 1857 = Euploca humilis
Schleidenia humistrata (Cham.) Fresen. 1857 = Euploca humistrata
Schleidenia inundata (Sw.) Fresen. 1857 = Euploca procumbens
Schleidenia lagoensis Warm. 1868 = Euploca lagoensis
Schleidenia leptostachya Fresen. 1857 = Euploca procumbens
Schleidenia linifolia (A. St.-Hil.) DC. 1845 = Euploca polyphylla
Schleidenia longepetiolata Fresen. 1857 = Euploca procumbens
Schleidenia polyphylla (Lehm.) Fresen. 1857 = Euploca polyphylla
Schleidenia polyphylla var. blanchetii (DC.) Fresen. 1857 = Euploca polyphylla
Schleidenia pubescens Fresen. 1857 = Euploca polyphylla
Schleidenia stenostachya (A. St.-Hil.) DC. 1845 = Euploca filiformis
Schleidenia subracemosa Warm. 1868 = Euploca lagoensis
Tournefortia humilis L. 1753 = Euploca humilis
Tournefortia incana (G. Mey.) G.
Tournefortia meyeri DC. 1845 = Euploca humilis