Volume 4 > Part 3.3 > Year 2023 > Page 605 > Leguminosae-Papilionoideae > Leptospron

Leptospron adenanthum (G.Mey.) A.Delgadowfo-0001042683

Amer. J. Bot. 98(10): 1710. 2011.— Phaseolus adenanthus G.Mey., Prim. Fl. Esseq.: 239. 1818; Baker in Hook.f., Fl. Brit. India 2(4): 200. 1876; Gagnep. in Lecomte, Fl. Indo-Chine 2(3): 226. 1916; Ridl., Fl. Malay. Penins. 1: 567. 1922; Merr., Fl. Manila: 261. 1912; Enum. Philipp. Fl. Pl. 2: 318. 1923; Craib, Fl. Siam. 1(3): 454. 1928.— Vigna adenantha (G.Mey.) Maréchal et al., Taxon 27(2–3): 202. 1978; Mascherpa & Stainier, Boissiera 28: 229. 1978; Thuân in Aubrév. & J.-F.Leroy, Fl. Cambodge, Laos & Vietnam 17: 185, pl. 27, f. 13–14. 1979; R.H.Maxwell in Dassanayake & Fosberg, Revis. Handb. Fl. Ceylon 7: 340. 1991; T.L.Wu & Thulin in C.Y.Wu et al., Fl. China 10: 256. 2010. Plate LXI: 5–6.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Perennial herb; stems twining, glabrous, glabrescent to sparsely pubescent. Stipules ovate or ovate-lanceolate, 3–4 by 1.5–2 mm, apex acute, base truncate, margin entire, outside glabrescent to sparsely pubescent, inside glabrous. Leaves: petioles 3.5–12.5 cm long, sparsely pubescent to glabrescent, with pulvinus, deeply striate when dry; rachis 1–2 cm long, sparsely pubescent to glabrescent. Leaflets ovate, ovate-lanceolate, lanceolate, elliptic or rhomboid, 5–11 by 3–6.5 cm, apex acute or acuminate and apiculate, base obtuse or rounded, margin entire, both surfaces glabrous to sparsely pubescent; lateral veins 5–7 pairs; stipels oblong or ovate, 2–2.5 by 0.5–1 mm, apex acute, glabrous; petiolules 3–4.5 mm long, densely pubescent. Inflorescence axillary, 3–8-fascicled, arranged in nodose-pseudoracemes; peduncles 8–22 cm long, glabrous to glabrescent; axis 1–3 cm long, pubescent; bracts ovate, 3.5–4.5 by ca 2 mm, striate, apex acute, base truncate, sparsely pubescent along margin. Flowers 2 in each fascicle, pink or purple, pale yellow with age; pedicels 1.5–2.5 mm long, pubescent; bracteoles 2, appressed to base of calyx tube, caducous, ovate, 2.5–3 by 1.5–2 mm, apex acute, sparsely pubescent along margin. Calyx: tube 3.5–4.5 by 5–6 mm; upper lobes connate, apex slightly divided to shallow lobes, 0.5–1 mm long; lower lobes lanceolate, 3–4 by 1–1.5 mm, apex acute or acuminate, both sides sparsely pubescent. Corolla: standard pink or purple, suborbicular, 2–2.5 by 1.8–2.2 cm, apex emarginate, base with 2 small auricles, 0.5–1 mm long, claw white, ca 3 mm long; wings pink or purple, obovate, 2.4–2.8 by 1.1–1.3 cm, apex rounded, near base with 1 small appendage, claw white, 5–6 mm long; keel white, spirally incurved for about 3 turns, 4–5 by 0.7–1 cm, near base with 1 small appendage, claw white, ca 1 cm long. Stamens: filaments white, 5–6 cm long; anthers yellow, oblong, ca 1.5 mm long. Pistil 5–6 cm long; ovary linear, sparsely pubescent; stigma hairy. Pods compressed, linear or oblong, 9–12 by 0.7–1 cm, glabrous to sparsely pubescent, with short apical beak, sutures covered with minute antrorse barbs; base stipitate, 1–1.5 mm long; fruit stalk 2–5 mm long, glabrous. Seeds 10–14, dry seeds greenish brown or dark reddish brown, reniform, sometimes ellipsoid or subglobose, 5–6 by 4–5 mm; aril developed.

Thailand : NORTHERN: Chiang Mai (San Pa Tong), Nakhon Sawan (Bueng Boraphet); CENTRAL: Pathum Thani (Lat Lum Kaeo), Nonthaburi (Pak Kret, Sai Ma, Tha Sai), Krung Thep Maha Nakhon (Bangkok) (Bang Chak, Bang Khen, Bang Na, Klong Sam Wa, Nong Chok, Tha Raeng), Samut Prakan (Song Khanong); PENINSULAR: Surat Thani (Kanchanadit).

Distribution : Throughout the tropics (Guyana – type).

Ecology : Open areas, along roadsides, disturbed areas, near paddy fields, along rivers or canals, sometimes cultivated, 0–300 m alt. Flowering and fruiting throughout the year.

Vernacular : Thua fai (ถั่วไฟ)(Chiang Mai); thua nok (ถั่วนก)(Bangkok); thua phi (ถั่วผี)(Central).