Volume 4 > Part 3 > Year 2018 > Page 263 > Leguminosae-Papilionoideae > Crotalaria

23. Crotalaria montana Heyne ex Rothwfo-0000199921

Nov. Pl. Sp.: 335. 1821; DC., Prodr. 2: 126. 1825; Niyomdham, Thai Forest Bull., Bot. 11: 144. 1978; Thuân et al., Fl. Cambodge, Laos & Vietnam 23: 213. 1987; Rudd in Dassanayake & Fosberg, Revis. Handb. Fl. Ceylon 7: 207. 1991; Adema, Blumea 51: 315. 2006; Ninkaew et al., Phytotaxa 320(1): 39. 2017. Plate XV: 1.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Herb 40–80 cm tall, erect; young branches terete, brown pubescent. Stipules narrowly linear, ca 1 mm long, caducous. Leaves simple, oblong, obovate or oblanceolate, 1.1–5.2 by 3–2.2 cm, apex acute or rounded, base obtuse, margin entire, upper surface white puberulous, lower surface brown pubescent; petioles 0.5–2 mm long; lateral veins inconspicuous. Inflorescences terminal, rarely axillary, open racemes, 4–11 cm long; peduncle 7–8 mm long, brown pubescent; bracts narrowly linear, 2–3 mm long, persistent; bracteoles inserted on the calyx tube, narrowly linear, 4–6 mm long, persistent; pedicels 1–2 mm long, brown pubescent. Calyx 7–9 mm long, campanulate, bilabiate; tube 1–2 mm long; lobes triangular, 6–7 mm long, glabrous inside, brown pubescent outside. Corolla yellow; standard obovate, 5–5.5 by 7–7.5 mm, apex emarginate, base obtuse, margin glabrous, claw 1–1.2 mm long, glabrous, margin white tomentose; wings elliptic, 5.8–6 by 2.5–3 mm, apex obtuse, base oblique, margin glabrous, claw 0.8–1 mm long, glabrous; keel lanceolate, 8–8.5 by 4–4.5 mm, beak twisted, apex attenuate, base rounded, margin white pubescent, claw ca 0.5 mm long, glabrous. Stamens: filaments fused for proximal 1.3–1.5 mm, free for distal 2–4 mm; anthers either narrowly linear, 1–1.3 mm long or oblong, ca 0.1 mm long. Ovary sessile, oblong, 2–2.2 mm long, glabrous; style 9–10 mm long, adaxially white puberulous in a single line along distal edge, abaxially glabrous. Pods sessile, elliptic, 3–4 by 2.8–3 mm, brown-black, glabrous. Seeds reniform, 2–2.8 by 1.5–2.2 mm, brown.

Thailand : NORTHERN: Chiang Mai (Doi Inthanon, Mae Klang), Chiang Rai (Khun Chae NP), Nan (Doi Phu Wae), Lamphun (Doi Khun Tan), Lampang (Doi Luang), Phrae (Mae Yom NP, Wang Chao), Uttaradit (Phu Miang-Phu Thong WS), Tak (between Tak and Ban Dan Lan Hoi); NORTH-EASTERN: Phetchabun (Nam Nao NP), Loei (Na Yang Tai, Wang Saphung), Udon Thani (Nong Bua), Sakon Nakhon (Phu Phan NP); EASTERN: Chaiyaphum (Thung Kramang), Yasothon (Sai Mun); SOUTH-WESTERN: Kanchanaburi (Erawan, Huai Ban Kao, Khao Ko I Wao, Si Sawat); CENTRAL: Saraburi (Ban Nong Bua, Muak Lek, Phu Khae); SOUTH-EASTERN: Sa Kaeo (Aranyaprathet), Chanthaburi (Hindat, Pong Nam Ron).

Distribution : India (type), China, Laos, Cambodia, Vietnam, Australia.

Ecology : Sunny places in deciduous dipterocarp forests, to 1,500 m alt.

Vernacular : Ya hang khang (หญ้าหางค่าง)(Lamphun); hing men foi (หิ่งเม่นฝอย)(Chiang Mai); hing bai khaep (หิ่งใบแคบ).