Dumasia prazeri Predeep & M. P. Nayar (1990: 109)

Jiang, Kai-Wen, Corlett, Richard T., Tian, Bin & Pan, Bo, 2021, Taxonomic notes on the genus Dumasia (Fabaceae), Phytotaxa 522 (2), pp. 109-120 : 111-112

2. Dumasia prazeri Predeep & M. P. Nayar (1990: 109) . Fig. 1

Type :— MYANMAR. West slope of Chattiah Hill, 12 th December 1900, J. C . Prazer 36 (holotype CAL!; isotypes CAL!) .

Description: —Twining herbs, 3‒ 5 m. Stem slender, striate, brownish villous, glabrescent with age. Leaves trifoliolate; stipules ovate-lanceolate, 3‒4 × 1‒1.5 mm, brownish pubescent; petiole 2‒7 cm, brownish villous as stem; rachis 4‒11 mm; leaflets elliptic or ovate, 3.6‒6.9 × 2.3‒4.4 cm, chartaceous, obtuse to rounded at apex and base, mucronate at apex, densely pubescent adaxially, more hairy abaxially, secondary veins 5‒7 pairs; lateral leaflets slightly smaller, oblique; petiolules 1.5‒3 mm, villous; stipels setaceous, 2‒3 mm. Pseudoracemes axillary, 5‒12 cm, many flowered, 2‒3 flowers per node; Bracts lanceolate, 3.5 × 0.5 mm, pubescent. Pedicels 1‒2 mm, pubescent; bracteoles 2, lanceolate, 2 × 0.5 mm, adnate to the base of the calyx, pubescent. Calyx tubular, obliquely truncate, sparsely pubescent, 4‒5 mm. Corolla yellow; standard suborbicular, 7‒8 mm, emarginate at apex, margins reflexed, auricles small; wings oblong, ca. 8 mm, rounded at apex, with a basal claw ca. 5 mm, lateral callosities crescent shaped, auricle small on upper margin; keels triangular, obtuse at apex, with a basal claw ca. 5 mm, auricle small. Stamens (9+1) diadelphous, 8 mm; anthers uniform, alternately on and short filaments. Ovary shortly stipitate, glabrous, with 3‒4 ovules; style glabrous; stigma capitate. Pods subfalcate, 3‒4 cm, glabrous.

Distribution and habitat: — Dumasia prazeri is distributed in China (Yunnan, newly recorded) and Myanmar. It grows under pine forest.

Phenology: —Flowering December to next January, fruiting February to March.

Chinese name: —The Chinese name of Dumasia prazeri is given here as 小Ë山āü, in which “小Ë” means small-flowered, as it bears the smallest flowers (only ca. 7‒8 mm) in the genus; “山āü” is the Chinese common name for the genus Dumasia .

Notes: — Dumasia prazeri was only known from the type locality for a long time, and no more specimens had been collected since the type specimens. One collection stored in HITBC from Jingdong County of Yunnan Province was traced during our herbarium work, and a further two small populations of the species were found in Zhenyuan County during our field work in Southern Yunnan, so here we report it as a new record for the flora of China .

Iconography citation: —Predeep & Nayar (1990: 110): figure 1.

Conservation status: —Except for the type locality, only three populations of Dumasia prazeri with ca. 5 individuals were found. According to IUCN Categories (2019), the species is considered here as Data Deficient (DD). Additional surveys for this species are needed.

Specimens examined:— CHINA. Yunnan: Jingdong County, Wenlong, Sanchaqing , roadside, 26 th December 2003, T. Y . Zhao , C. W . Duan , & Y. L . Shi 66 ( HITBC). Zhenyuan County, near an agritourism resort outside the town, moist slope, 8 th January 2012, B . Pan 7 ( HITBC). Zhenyuan County, Xieqipo Park, 4 th February 2012, B . Pan 14 ( HITBC) .

Figures

FIGURE 1. Dumasia prazeri Pradeep & M. P. Nayar A. Flowering branch; B. Pods. Photographs by Bo Pan.