Flemingia angusta Craib (1913: 41)

Do, Truong Van & Gao, Xin-Fen, 2020, Taxonomic revision of the genus Flemingia (Leguminosae) from Indo-Chinese floristic region, Phytotaxa 429 (1), pp. 1-38 : 24-25

11. Flemingia angusta Craib (1913: 41) . Type :— MYANMAR. Tharrawaddy , Kangyi Reserve, Lace 5858 (Holotype, K; isotype, E-00157791!)

Perennial shrubs, erect. Branchlets terete, ca. 3 mm diam., with obviously lenticellate, glabrous. Petiole 5.3–6.5 cm long, winged, pubescent; petiolules 3–4 mm long, pubescent. Stipules lanceolate, caducous. Leaves digitately 3-foliolate; leaflets angusta-lanceolate, 15–22 cm long, 1.5–3.2 cm wide, apex acute to acuminate, base cuneate, unequal, leathery, adaxially sparsely sessile brownish glands, glabrous, abaxially densely sessile brownish glands, glabrous, except for veins, basal veins 3, unequal, external ones reaching upwards to more than one-three of the length of the lamina, lateral veins pinnate, 10–11 pairs, venation distinct and prominent. Inflorescence racemose, axillary, solitary or cluster of two–three racemes; inflorescence axis conspicuous, 2–5 cm long, straight; bracts lanceolate-ovate, imbricate, 5–6 mm long, 1.5–2 mm wide, margin densely hairy, caducous. Flowers 6–8 mm long; pedicels subsessile or nearly so, ca. 1 mm long. Calyx tube ca. 2 mm long, calyx lobes unequal, upper subequally 4-lobed, straight, linear-lanceolate, 3 mm long, 1 mm wide, lower 1-lobed, broadest and longest, 4.5 mm long, 1.5 mm wide. Corolla purplish, subequal to calyx; standard orbicular, 5–6 mm long, 2–3 mm wide; wings obovate, 4–5 mm long, 1.5–2 mm wide; keel falcate, 5–6 mm long, 2.5–3 mm wide. Stamens diadelphous; staminal tube 5–6 mm long; vexillary stamen free, 3–4 mm long, thin, glabrous. Pods ellipsoid, 9–10 mm long, 4–5 mm diam.

Ecology and phenology: — Flemingia angusta grows in Pine forests, elev. 1300–1600 m. Flowering and fruiting are observed from January to February

Distribution: —Endemic to Myanmar.

Notes: — Flemingia angusta is a very distinct species, nearest to F. stricta with similar inflorescence, but it totally differs from the latter by the morphological characters of petioles (distinctly winged vs. not winged), stipules (caducous vs. persistent), leaf blade (angusta-lanceolate vs. elliptic to lanceolate-ovate), venations (basal veins 3, unequal, external ones reaching upwards to more than one-three of the length of the lamina vs. pinnate), and bracts (lanceolate-ovate, subequal to corolla vs. linear-lanceolate, much longer than corolla).

Representative specimens: — MYANMAR. Henzada, Yenan Quang , February 1903, Shaik Mokaim 1343 (K-001097315) ; Pegu River , 6 February 1854, McClelland s.n. (K-001097316) .