Crotalaria montana B.Heyne ex Roth (1821: 335)

Ninkaew, Sakuntala, Balslev, Henrik, Pornpongrungrueng, Pimwadee & Chantaranothai, Pranom, 2017, Crotalaria L. (Fabaceae: Faboideae) in continental Southeast Asia, Phytotaxa 320 (1), pp. 448-450 : 448-450

27. Crotalaria montana B.Heyne ex Roth (1821: 335) . Type :— INDIA. Heyne 5384 (holotype K001120735 !).

= Crotalaria linifolia var. angustifolia Gagnepain (1916: 332) . Crotalaria montana var. angustifolia (Gagnep.) Niyomdham (1978: 145) . Type:— LAOS. Xieng Khouang: September 1917, Mievilie 37225 (holotype P02297498!).

Herb, erect, 40–80 cm high; young branches terete, brown pubescent. Leaves simple. Stipules narrowly linear, ca. 1 mm long, caducous. Petioles 0.5–2 mm long. Lamina oblong, obovate or oblanceolate, 1.1–5.2 × 0.3–2.2 cm, base obtuse, apex acute or rounded, margin entire, white puberulous upper, brown pubescent lower; 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. Pedicels 1–2 mm long, brown pubescent. Bracteoles inserted on the calyx tube, narrowly linear, 4–6 mm long, persistent. 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: claw 1–1.2 mm long, glabrous, margin white tomentose; blade obovate, 5–5.5 × 7–7.5 mm, base obtuse, apex emarginate, margin glabrous. Wings: claw 0.8–1 mm long, glabrous; blade elliptic, 5.8–6 × 2.5–3 mm, base oblique, apex obtuse, margin glabrous. Keel: claw ca. 0.5 mm long, glabrous; blade lanceolate, 8–8.5 × 4–4.5 mm, beak spirally twisted, base rounded, apex attenuate, margin white pubescent. 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 the distal edge, abaxially glabrous. Pods sessile, elliptic, 3–4 × 2.8–3 mm, brown-black, glabrous. Seeds reniform, 2–2.8 × 1.5–2.2 mm, brown.

Representative specimens: — CAMBODIA. Kratie, Sambour , 2 August 2007, Maxwell 07-475 ( CMUB) . No locality, 18 November 1938, Miilla 517 ( P) . LAOS. Savannakhet: 8 January 1925, Poilane 11540 ( P) . Vientiane: Ban Huai Yang , 23 September 1998, Lamxay et al. 12 ( FOF) . Xieng Khouang: 2 November 1920, Chevalier 2214 ( BKF, L, P) . MYANMAR. 11 October 1908, Lace 4309 ( K) . THAILAND. Chiang Mai: Doi Inthanon , 6 December 1984, Mitsuta et al. T-45395 ( AAU, BKF) . Chiang Rai: Mae Chae National Park , 16 November 1997, Maxwell 97-1350 ( CMUB) . Chaiyaphum: Tung Kramang , 9 August 1972, Larsen et al. 31574 ( AAU, BKF) . Kanchanaburi: Erawan , 2 July 1974, Larsen & Larsen 34021 ( AAU, BKF, K) . Lampang: Doi Luang National Park , 12 December 1998, Petrmitr 401 ( CMUB) . Lamphun: Doi Khun Tan National Park , 20 October 1985, Thaithong 153 ( BCU) . Loei: Na Yang Tai , 14 November 2011, Lakoet 207 ( QBG) . Nan: Doi Phu Wae , 12 November 2000, Srisanga 1801 ( CMUB) . Phrae: Mae Yom National Park , 8 December 1993, Maxwell 93-1453 ( CMUB) . Phetchabun: Nam Nao National Park , 16 November 2013, Ninkaew 296 ( KKU) . Sa Kaeo: Aranyaprathet , 18 October 1928, Put 2015 ( BK) . Sakon Nakhon: Phu Phan National Park , 12 November 2013, Ninkaew 383 ( KKU) . Saraburi: Ban Nong Bua , 28 September 1927, Put 1097 ( BK) . Tak: between Tak and Ban Dan Lan Hoi , 24 July 1973, Murata et al. T-16975 ( AAU, BKF) . Uttaradit: Phu Miang-Phu Thong Wildlife Sanctuary , 13 September 2011, Romklao Botanical Garden 313/2554 ( QBG) . Yasothon: Sai Mun , 18 August 2014, Ninkaew 332 ( KKU) . VIETNAM. Gia Lai: Chu Prong , 22 October 1978, Loc & Ba P 2342 ( HNU) . Hoa Binh: Lac Thuy , 1 June 1964, Anon. 4 ( HNU) . Khanh Hoa: Nha Trang , 10 March 1922, Poilane 2795 ( P) . Kon Tum: Dak Glei , 4 February 1947, Poilane 32973 ( P) . Lam Dong: Da Lat, 6 August 1924, Evrard 1117 ( P) . Lang Son: Huu Lung , Hoa Lac, 6 June 1974, Nghia 64 ( HNU) . Ninh Binh: Tam Diep , 10 April 1962, Khoi 928 ( HNU) . Ninh Thuan: Phan Rang-Thap Cham , Cana, 8 November 1923, Poilane 8498 ( P) .

Distribution: —Asia ( India, China, Thailand, Laos, Cambodia, Vietnam), Australia. ( Figure 17 ).

Ecology: —Sunny places in deciduous dipterocarp forests, elevation 4–1500 m.

Notes: — Crotalaria montana is similar to C. albida , in leaf morphology and habit, but differs from that species in its shorter pedicels (1–2 mm vs 4–6 mm), longer bracteoles (4–6 mm vs 2–3 mm), its sessile ovary and elliptic pods.

Figures

FIGURE 17. Distribution map of Crotalaria montana in continental Southeast Asia.