Research Article |
Corresponding author: Joongku Lee ( joongku@cnu.ac.kr ) Academic editor: Karol Marhold
© 2020 Danh Thuong Sy, Do Van Hai, Ritesh Kumar Choudhary, The Bach Tran, Hoang Mau Chu, Huu Quan Nguyen, Thi Thu Nga Nguyen, Gordon C. Tucker, Joongku Lee.
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:
Sy DT, Hai DV, Choudhary RK, Tran TB, Chu HM, Nguyen HQ, Nguyen TTN, Tucker GC, Lee J (2020) Capparis kbangensis (Capparaceae), a new species from central Vietnam. PhytoKeys 151: 83-91. https://doi.org/10.3897/phytokeys.151.50477
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Capparis kbangensis Sy & D.V. Hai, a new species from Kbang District, Gia Lai Province, Vietnam, is described and illustrated. The new species is morphologically similar to Capparis versicolor but differs by several characters such as emarginate leaf apex, hairy margin of sepals, smaller fruits, and fewer seeds per fruit. Its ecology and conservation status are provided along with a taxonomic key to the closely allied species.
Capers, Capparis versicolor, Gia Lai Province, taxonomy
Capparis Tourn. ex L. is one of the largest genera of the family Capparaceae and is important due to its economic and medicinal value (
While revising the taxonomy of Capparis in Vietnam, a floristic exploration trip was conducted during 2011 to Kbang District of Gia Lai Province. During this trip, an interesting Capparis species with young flowers and ripened fruits was encountered. However, only one individual could be located at that time. During our other trips to the same area conducted during 2017–2018, another population with 11 individuals in both flowering and fruiting stage could be traced. After a thorough examination of the type materials housed at HN, K, E, P, CAL and comparison of the morphological features of the collected taxon with all Capparis species from South east Asia (
Capparis kbangensis is similar to Capparis versicolor Griff. in the number of secondary veins of the leaves, color of petals, number of stamens, the length of gynophore, but differs from it by the leaf characters (emarginate vs acute apex), hairy sepal margins (vs. glabrous), smaller fruits and number of seeds per fruit (4–5 per fruit, reniform vs. 15 per fruit, nearly polygonal).
Vietnam. Gia Lai Province: Kbang District, along the road, on hillocks, alt. 626 m, 14°11'44.0"N, 108°35'40.9"E, 07 April 2018, Sy Danh Thuong, Do Van Hai, Thuong 0704201801 (holotype HN!; isotype, IBSC!).
Scandent shrubs, up to 5 m high. Innovations with densely brown hairs, glabrous when mature. Thorns ca. 3 mm long, reddish brown, recurved. Petiole 6–8 mm long, hairy; blade elliptic to obovate, 4.5–6 × 2.8–3.2 cm, glabrous, young leaves yellowish green, dark green when older; midvein abaxially raised, adaxially flat; secondary veins 6–7 on each side of midvein, abaxially not obvious; base round or cuneate; apex emarginate. Inflorescence corymbs simple, terminal, with the lower flowers axillary, or few flowered in lateral racemes; pedicels 1.5–1.7 cm long, glabrous. Flower buds globose, 5–6 mm. Sepals 0.9–1 × 0.4–0.5 cm long, outer pairs hairy along margins, inner pairs hairy inside and along the margins; sepals of outer whorl boat-shaped and inner whorl obovate. Petals white, later turns to light pink, obovate, lower pairs 1.6–1.7 × 0.7–0.9 cm, upper pairs 1.7–1.8 × 0.9–1 cm, both surfaces pubescent, especially at the base. Stamens 57–60; filaments 3–3.5 cm long, glabrous, white; anthers ca. 2 mm long. Disk nearly parallelogram shaped. Gynophore 3.8–4.2 cm long, glabrous. Ovary elliptic, 0.2 × 0.1 cm, top with beak, yellowish green, glabrous, placentas 4. Fruits globose, 1.8–1.9 cm in diam, black when mature, surface with some knobs, beaked apex. Seeds 4–5 per fruit, reniform, 4–5 × 2–3 mm.
Vietnam. Gia Lai Province, Kbang District, near the edge of forest, alt. 630 m, 14°12'16.0"N, 108°36'18.5"E, 11 March 2011, T.T. Bach, D.V. Hai, B.H. Quang, H.M. Tam, S.D. Thuong, PTV 698 (HN!). VIETNAM. Gia Lai Province, Kbang District, along the road, on the small hillocks, alt. 626 m, 14°11'44.0"N, 108°35'40.9"E, 28 April 2017, D.V. Hai, Hai28042017 (HN!).
Fls. March to April; Frts: April to August.
Capparis kbangensis is currently known from Kbang District, Gia Lai Province. It was found growing on the basaltic soils of hillocks along the roads or near the edge of forests, at an elevation of around 626–630 m. Capparis micracantha DC., Saccharum spontaneum L., Chromolaena odorata (L.) R.M. King & H. Rob., Erycibe sp., Callicarpa albida Bl., Bidens pilosa L. were found associated with the new species.
Capparis kbangensis Sy & D.V Hai, sp.nov (A, C–J drawn from holotype Thuong0704201801 B drawn from PTV698; K, L drawn from Hai28042017) A flowering branch B stem with thorns C base of leaf D apex of leaf E sepals F petals G filament and anther H disk I gynophore and ovary J ovary K fruiting branch L fruit (Drawn by Mrs. Le Kim Chi).
The new species derives its name from the type locality Kbang District of the Gia Lai Province in Vietnam. In Vietnamese, it is known as Cáp kbang.
During the last 10 years of our survey in Vietnam forests, we could observe only 12 individuals of Capparis kbangensis growing along the road or near the edge of forests. These habitats are frequently affected by the anthropogenic activities. Locating this species in the nearby areas proved a futile exercise. Therefore, Capparis kbangensis is assessed as Critically Endangered (CR) or Data deficient (DD) based on the IUCN Red List Categories (
Capparis kbangensis is morphologically similar to Capparis versicolor. However, it also exhibits some similarities with C. monantha, C. siamensis, and C. flavicans. A comparison of the morphological characters of these species belonging to section Monostichocalyx is summarized in Table
Morphological comparison of Capparis kbangensis with others species of section Monostichocalyx.
Characters | Capparis kbangensis | Capparis versicolor | Capparis monantha | Capparis siamensis | Capparis flavicans |
---|---|---|---|---|---|
Shape of leaf | elliptic, nearly obovate or obovate | elliptic, oblong | ovate, elliptic, | ovate | obovate, elliptic, rhomboid |
Size of leaf (cm) | 4.5–6 × 2.8–3.2 | 3.5–8 × 1.5–3.5 | 4–7 × 2–4 | 5–10.5 × 3–4.5 | 1.2–3 × 1–1.7 |
Leaf surface | glabrous | glabrous | hairy when young, soon glabrous | hair on the midvein and secondary vein | densely hairy when young, soon glabrous |
Leaf base | round or cuneate | cuneate | obtuse, acute | cordate, obtuse, round | obtuse, cuneate, acute |
Leaf apex | emarginate | acute, obtuse, V-shape or acuminate | acute-acuminate, mucronate | acute or acuminate | round, obtuse, notched, mucronate |
Secondary veins (in pairs) | 6–7 | 6–9 | 2–4 | 4–7 | 3–5 |
Inflorescence | simple corymb | simple corymb | solitary | solitary | solitary |
Length of pedicels of flowers (in cm) | 1.5–1.7, glabrous | 1.5–5, glabrous | 0.5–1.5, glabrous | 1–1.3, hairy | 1–3, hairy |
Shape of sepal | outer pairs boat-shape. inner pairs obovate | outer pairs boat-shape or nearly orbicular. inner pairs elliptic | both outer and inner pairs obovate | both outer and inner pairs elliptic or boat-shaped | outer pairs boat-shape, inner pairs ovate or obovate |
Size of sepal (in cm) | 0.9–1 × 0.4–0.5 | 0.9–1.1 × 0.8–1 | 1.4–1.8 × 0.6–0.8 | 0.8–1 × 0.3–0.5 | 0.6–0.8 × 0.4–0.5 |
Sepal surface | outer pairs only hairy along the margin. inner pairs hairy inside and along the margins | outer pair and inner pair glabrous | outer pair and inner pair only hairy outside | outer pairs hairy. inner pairs hairy outside | inner pair more hairy than outside |
Shape of petal | obovate | nearly orbicular, obovate | obovate | obovate, sometimes spathulate | obovate |
Size of petal (cm) | inner pairs 1.6–1.7 × 0.7–0.9; outer pairs 1.7–1.8 × 0.9–1; both surface hairy, especially at the base | 1.2–1.7 × 0.7–1.4, glabrous or inside hairy near base | 2.5–2.8 × 0.8, hairy outside | 2–2.5 × 0.5–0.8, hairy outside | 0.8–0.9 × 0.4, densely hairy outside |
Petal color | white, turns light pink on maturity | white, purple, pink | white with yellow | green, white, upper pairs with a deep yellow blotch, fading red | yellow, upper pairs with golden yellow blotch, fading brown |
Stamens | 57–60 | 50–70 | more than 46 | 36–46 | 6–12 |
Ovary | elliptic, 0.2 × 0.1 cm, top with knob, glabrous | elliptic, 0.2 cm long, glabrous | elongate, 0.5 × 0.1 cm, long beak, hairy | ovate, 0.3–0.5 × 0.25 cm; beaked, densely yellowish hairy | ovate, obovate, densely hairy |
Gynophore | 3.8–4.2 cm, glabrous | 3–5 cm, glabrous | 2.1–2.4 cm, hairy | 2–2.5 cm, hairy | 1.2–1.7 cm, hairy |
Fruits | globose, diam. 1.8–1.9 cm, surface glabrous with some protuberances, beaked | globose, diam. 3–5 cm, surface glabrous or scabrous, sometimes with a few small irregular protuberances, beaked | unknown | nearly globose, elliptic or ovate; 3.5–5.5 × 2.5–3 cm, with 8 longitudinal rows of small protuberances, sometimes glabrous | subglobose, elliptic, 2.5–4 × 2–3.5 cm, surface with densely small protuberances |
Seeds | 4–5 per fruit, reniform | 15 per fruit, nearly polygonal | unknown | 0.7–1 × 0.5–0.6 cm | 2–8 per fruit, elliptic, reniform |
Distribution | Vietnam | China, India, Malaysia, Myanmar, Thailand, Vietnam | Thailand | Cambodia, Vietnam, Thailand | Cambodia, India, Malaysia, Myanmar, Thailand, Vietnam |
Habitat | on the basaltic soils of the hillocks along the roads or near the edge of forests | on slightly dry areas, sandy areas, scattered forests or among shrubs | on limestone hills | on mixed deciduous forest, bamboo forest, open dry jungle, edge of evergreen forest | dry scrub, deforested land, evergreen jungle, dry Dipterocarp forest on poor sandy or rocky soil |
Elevation (m asl) | 626–630 | 100–1000 | 100 | 50–1200 | 40–350 |
Phenology | Fls: March-April | Fls: April-July | Fls: February-August | Fls: December-April | Fls: December-April |
Frts: April-August | Frts: July-April | Frts: unknown | Frts: May-November | Frts: May-November |
1 | Stamens 6–12 | C. flavicans |
– | Stamens more than 30 | 2 |
2 | Leaf hairy. Ovary elongate or ovate, hairy | 3 |
– | Leaf glabrous. Ovary elliptic, glabrous | 4 |
3 | Sepal obovate. Petals yellowish-white. Ovary elongated | C. monantha |
– | Sepal boat-shaped. Petal greenish-white. Ovary ovate | C. siamensis |
4 | Apex of the leaf acute, obtuse, V-shape or acuminate. Inner pairs of sepals elliptic, glabrous. Fruits globose, diam. 3–5 cm. Seeds 15 per fruit, nearly polygonal | C. versicolor |
– | Apex of the leaf emarginate. Inner pairs of sepals obovate, hairy. Fruits globose, diam. 1.8–1.9 cm. Seeds 4–5 per fruit, reniform | C. kbangensis |
We thank the curators and staff of the herbaria HN, HNU, HNPM and VNM for making their materials accessible. We also thank the scientists of the Department of Botany, Institute of Ecology and Biological Resources (IEBR) for collecting specimens. Thanks are due to Mrs. Le Kim Chi for drawing the illustration. This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 106.03-2019.10. It is also supported by Chungnam National University. RKC is thankful to the Director, Agharkar Research Institute for facilitating research activities between India and Vietnam.