Research Article |
Corresponding author: Yun-Hong Tan ( tyh@xtbg.org.cn ) Academic editor: Alexander Sennikov
© 2018 Bin Yang, Hong-Bo Ding, Jian-Wu Li, Yun-Hong Tan.
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:
Yang B, Ding H-B, Li J-W, Tan Y-H (2018) Two new species of Hiptage (Malpighiaceae) from Yunnan, Southwest of China. PhytoKeys 110: 81-89. https://doi.org/10.3897/phytokeys.110.28673
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Hiptage pauciflora Y.H. Tan & Bin Yang and Hiptage ferruginea Y.H. Tan & Bin Yang, two new species of Malpighiaceae from Yunnan, South-western China are here described and illustrated. Morphologically, H. pauciflora Y.H. Tan & Bin Yang is similar to H. benghalensis (L.) Kurz and H. multiflora F.N. Wei; H. ferruginea Y.H. Tan & Bin Yang is similar to H. calcicola Sirirugsa. The major differences amongst these species are outlined and discussed. A diagnostic key to the two new species of Hiptage and their closely related species is provided.
Hiptage , Malpighiaceae , samara, Yunnan, China
Hiptage Gaertn. (
The genus name, Hiptage, is derived from the Greek “hiptamai” which means to fly and refers to its distinctive three-winged fruit samaras, i.e. a larger middle wing and two smaller lateral wings, sometimes the dorsal wing is absent or present as a small crest, most species bear an elongated commissural gland on the calyx (
During floristic surveys in southern and south-western Yunnan from 2009 to 2017, some populations of Hiptage were discovered and some plants were cultivated in Xishuangbanna Tropical Botanical Garden (
Measurements and assessments of morphological characters of the two possible new species H. pauciflora Y.H. Tan & Bin Yang and H. ferruginea Y.H. Tan & Bin Yang were based on dried specimens in herbarium and fresh materials in field observations and cultivation plants flowered and fruited in
Shao hua feng zheng guo (少花风筝果) (Chinese)
Hiptage pauciflora is similar to H. benghalensis in elliptic-oblong leaf blades, petal shape and size and also shares similarities with H. multiflora in having leaf marginal gland dots, sub-orbicular calyx glands and not decurrent to pedicel, obovate middle wing of samara, but differs from the former by lacking basal glands at the leaf base, calyx glands ovate or sub-orbicular to cordate, scarcely decurrent to pedicel, middle wing of the samara obovate-elliptic, lanceolate bracteoles 7–11 mm (vs. 1 mm); and differs from the latter by its fewer flowers, longer pedicels, without basal glands at the leaf base and elliptic sepals (vs. ovate).
CHINA. Yunnan Province, Menglian, Chengzi, limestone forest, the voucher from a cultivated plant at Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 1 March 2017, Y.H. Tan & B. Yang,
Woody climbing shrubs. Young branches pubescent, older twigs with rounded lenticels, rough warts dot-like. Leaf blades ovate or ovate-elliptic to elliptic-oblong, 6.0–10.5 × 2.5–12.0 cm, base subcordate to cordate, apex attenuate to acuminate, lateral veins 5–8 pairs, without basal glands; young leaves silver-grey pubescent; mature leaves with upper surface glabrous, lower surface sparsely pubescent, conspicuous along the midvein, with 3–6 pairs marginal gland dots. Petiole 4–7 mm long, pubescent. Racemes axillary or terminal, 5–10 cm, silver-grey pubescent; peduncle 0.5–2 cm. Flowers pink; Bracts triangular to ovate-triangular, 1.5–2 mm, bracteoles lanceolate, 7–11 × 1–3 mm; Pedicels 1.8–2.9 cm long, pubescent, articulate at the middle to a little above the middle; Calyx with 1 gland, prominent, ovate or sub-orbicular to cordate, scarcely decurrent to pedicel; Sepals elliptic to ovate-elliptic, ca. 5–7 × 2.5–3 mm, apex obtuse, base truncate, pubescent outside; Petals 5 per flower, pink, with yellowish blotches, ovate-oblong to suborbicular, 1.2–1.4 × 0.8–1.1 cm, glabrous, base rounded to subcordate, apex rounded, margin fringed, claw 1–1.5 mm; Stamens 10, differing in size, the longest filaments 12–13 mm, circinate at apex, the short ones 5–8 mm, anther ca. 1.5–2 mm long. Ovary ca. 2.5–3 mm in diam., pilose; style1.2–1.4 cm long, glabrous, circinate at apex. Mericarps hairy, middle wing obovate-elliptic, puberulous. apex rounded, base obtuse, margin sometimes repand, 1.7–2.5 × 1–1.3 cm, lateral wings oblong, apex obtuse or rounded, margin sometimes crested, 1.3–1.6 × 0.3–0.5 cm; dorsal wing present or not, 2–4 × 1–2 mm.
Hiptage pauciflora Y.H.Tan & Bin Yang, sp. nov. A, B Habit C Inflorescence (lateral view) D Inflorescence (frontal view) E Flowering branch F Flower bud G Flowers (lateral view) H Flower (frontal view) I Flower (I1 Petals; I2 the longest stamen; I3 the 9 short stamens; I4 Pedicel; I5 Calyx; I6 Style) J Samaras (lateral view and showing calyx gland) K Samaras (vertical view) L Samaras (dorsal view) M Leaves (adaxial view). Photographed by Y.H. Tan, H.B. Ding and B. Yang.
Hiptage pauciflora has been observed in flower at Xishuangbanna Tropical Botanic Garden under cultivation from the beginning of March and in fruit from March to April.
The species epithet refers to its inflorescence with fewer flowers, usually 1–8 flowers.
According to the introduction record, H. pauciflora was originally collected from Menglian, south-western Yunnan. Additional collections in the future may help to clarify its full distribution.
Due to insufficient field surveys so far, very few details about its natural distribution and population status are currently known. The lack of sufficient data does not allow a final risk evaluation and the species might be regarded as data deficient (DD) according to the IUCN Red List Categories (
(paratypes). CHINA. Yunnan, Menglian, Chengzi, limestone forest, 7 February 1976, G. D. Tao 9082 (HITBC!, IBSC!). Menglian, from Mangxin to Chahe, 22°12.985'N, 99°35.292'E, alt. 987m, limestone forest, 29 March 2010, E. D. Liu, W. Fang, W. Z. Ma & H. J. Dong 2376 (KUN!). Menglian, Chengzi, the voucher from a cultivated plant at Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 8 March 2018, B. Yang & H.B. Ding,
Xiu mao feng zheng guo (锈毛风筝果) (Chinese)
Hiptage ferruginea is similar to H. calcicola in elliptic leaf shape, hairy pedicels and calyx without glands, suborbicular petals; but differs in having marginal gland dots, without laminal gland dots (vs. without marginal gland dots, with laminal gland dots), pink petals (vs. white) larger size, claw 2.5–4 mm (vs. 1–2 mm), middle wings of samara obovate (vs. oblong).
CHINA. Yunnan, Mengla, Menglun, tropical seasonal moist limestone forest, 690 m a.s.l, B. Yang & X.D. Zeng, 4 March 2017, XTBG0022 (holotype, HITBC!).
Scrambling shrubs. Young branches glabrescent, older twigs with rounded lenticels, rough, axillary buds sparsely pubescent. grey blades elliptic or elliptic-oblong, 6.0–7.5 × 2.2–2.8 cm, glabrous, surface without larminal gland dots, base cuneate to obtuse, with 1 pair of dark-coloured marginal glands near base, apex acute to attenuate, midrib prominent beneath, lateral veins 5–6 pairs. Petiole 5–7 mm long, glabrous. Racemes axillary or terminal, multiflorous, rust-coloured hairy, up to 6 cm. Flowers pink to pinkish-white; Bracts triangular to lanceolate, 1.5–2 mm, bracteoles ovate-triangular, ca.1 mm long; Pedicels 0.5–1.3 cm long, rust-coloured hairy, articulate below the middle; Calyx glands absent; Sepals elliptic to ovate-elliptic, ca. 2.5 × 2 mm, apex obtuse, base truncate, pubescent outside; Petals 5 per flower, spreading, suborbicular, 7–8 × 6–7 mm, pubescent outside, densely near base, glabrous inside, base rounded to truncate, apex rounded, margin fimbriate, claw 2.5–4 mm, adaxial pubescent; Stamens 10, differing in size, the longest filaments ca. 8–9 mm, the short ones 5–6 mm, anther ca. 1 mm long. Ovary ca. 2 mm in diam., style ca. 9–10 mm long, glabrous. Mericarps dark puberulous, middle wing obovate, puberulous. apex rounded, margin repand, 1.7–2 × 1–1.2 cm, lateral wings oblong, apex margin crest, 0.9–1.1 × 0.5–0.7 cm.
Hiptage ferruginea Y.H. Tan & Bin Yang, sp. nov. A, B Habit C Flowering branch D, E Inflorescence F Flower (lateral view) G Flower (dorsal view) H Flower (frontal view) I Petals J Flower (picked petals) K, L Samaras M Leaf (abaxial view) N Leaf (adaxial view) O Leaf base (showing the marginal glands). Photographed by B. Yang.
Flowering in March and fruiting occurs from March to April.
The specific epithet is derived from its inflorescence rust-coloured hairy, ferruginous appearance.
There is only one population and less than 10 individuals known from the limestone areas in the Menglun Natural Reserve.
Since we have not discovered the wild population of this species in other places, very few details about its natural distribution and population status are currently obtained and the information is too inadequate to assess its risk of extinction. At present, it is proposed that it be considered as a taxon under the Data Deficient (DD) category on the basis of current IUCN Red List Categories and Criteria (
1 | Calyx glands conspicuous | 2 |
– | Calyx glands inconspicuous or absent | 4 |
2 | Calyx glands more or less decurrent on the pedicel, middle wings of samara 3–5 cm long | H. benghalensis |
– | Calyx glands scarcely decurrent to pedicel, middle wings of samara less than 3 cm long | 3 |
3 | Leaf blade ovate or ovate-elliptic to elliptic-oblong, less than 10 cm long, bracteoles lanceolate, 7–11 mm, leaf basal gland dots absent, inflorescence with fewer flowers, usually 1–8 flowers, pedicels 1.8–2.9 cm | H. pauciflora |
– | Leaf blade oblong, 12–13 cm long, bracteoles small, ca. 1mm, leaf basal gland dots 1 pair, inflorescence with many flowers, pedicels ca.1 cm | H. multiflora |
4 | Leaf marginal gland dots absence and with 1–2 pairs larminal gland dots | H. calcicola |
– | Leaf marginal gland dots conspicuous, usually 1 pair and larminal gland dots absent | H. ferruginea |
The zygomorphic or mirror-image flower of the Hiptage is a unique feature of evolutionary and biological importance that enhances adaptations (
Morphological comparison of key characters in Hiptage pauciflora, H. ferruginea and the morphological similar taxa.
Character | Hiptage pauciflora | H. benghalensis | H. multiflora | H. ferruginea | Hiptage calcicola |
---|---|---|---|---|---|
Leaf blade | ovate or ovate-elliptic to elliptic-oblong, 6.0–10.5 × 2.5–12.0 cm | oblong, elliptic-oblong, or ovate-lanceolate, 9–18 × 3–7 cm | oblong, 12–13 × 5–5.5 cm | elliptic or elliptic-oblong, 6.0–7.5 × 2.2–2.8 cm | elliptic or ovate, 3–10.5 × 1–4.5 cm |
Leaf marginal gland dots | 3–6 pairs | 2–8 pairs | 2–4 pairs | 1 pair | absent |
Leaf basal gland dots | absent | 1 pair | 1 pair | absent | absent |
Larminal gland dots | absent | absent | absent | absent | 1–2 pairs |
Bracteoles | lanceolate, 7–11 × 1–3 mm | acute, ca. 1mm | ovate-triangular, ca.1 mm | ovate-triangular, ca.1 mm | acute, ca. 1mm |
Flowers | pink | white | white? | pink to pinkish-white | white |
Pedicels | pubescent,1.8–2.9 cm | pubescent, 0.8–2.5 cm | puberulent, ca. 1 cm | dark red hairy, 0.5–1.3 cm | pubescent, 0.4–2 cm |
Calyx glands | ovate or sub-orbicular to cordate, scarcely decurrent to pedicel | elliptic, oblong, triangular, lanceolate to oblanceolate; more or less decurrent on the pedicel | sub-orbicular; not decurrent to pedicel | absent | inconspicuous or absent |
Sepals | elliptic to ovate-elliptic | broadly elliptic or ovate | ovate | elliptic to ovate-elliptic | elliptic |
Petals | ovate-oblong to sub-orbicular | ovate-oblong to suborbicular, glabrous | unknown | suborbicular, 7–8 × 6–7 mm | suborbicular, 3.5–4 × 3.5–4 mm |
Claw | 1–1.5 mm | 1–2 mm, glabrous | unknown | 2.5–4 mm, pubescent | 1–2 mm, hairy |
Middle wings of Samara | obovate-elliptic, 1.7–2.5 × 1–1.3 cm | oblong, elliptic or obovate-lanceolate, 3–5 × 1–1.6 cm | obovate, 2.2–2.5 × 0.7–1.0 cm | obovate, 1.7–2 × 1–1.2 cm | oblong, 2–2.5 × 0.5–0.8 cm |
We are grateful to Li’ E Yang and Chong-Rui Ai for the literature scan, Jian-Wen Zhang for providing the specimens information deposited in KUN. This work was financially supported by a project of the