Hiptage ferruginea Y.H.Tan & Bin Yang, 2018

Yang, Bin, Ding, Hong-Bo, Li, Jian-Wu & Tan, Yun-Hong, 2018, Two new species of Hiptage (Malpighiaceae) from Yunnan, Southwest of China, PhytoKeys 110, pp. 81-89 : 83-85

Hiptage ferruginea Y.H.Tan & Bin Yang sp. nov. Figure 2

Vernacular name.

Xiu mao feng zheng guo (锈毛风筝果) (Chinese)

Diagnosis.

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).

Type.

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!).

Description.

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.

Phenology.

Flowering in March and fruiting occurs from March to April.

Etymology.

The specific epithet is derived from its inflorescence rust-coloured hairy, ferruginous appearance.

Distribution and habitat.

There is only one population and less than 10 individuals known from the limestone areas in the Menglun Natural Reserve.

Conservation status.

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 ( IUCN 2012).

Key to the species of Hiptage pauciflora , H. ferruginea and their closely related species

Figures

Figure 2. 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.