Crotalaria filiformis Wallich ex Bentham (1843: 475)

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

14. Crotalaria filiformis Wallich ex Bentham (1843: 475) . Type (lectotype designated here):— MYANMAR. Bago: Pyay (Prome), 1826, Wallich 5389 (lectotype K-W K001120745!, isolectotypes E00288836!, K000591141!, K000591142!, K-W K001120746!). = Crotalaria kerrii Craib (1922: 170) . Crotalaria filiformis var. kerrii (Craib) Niyomdham (1978: 134) . Type (lectotype designated here):— THAILAND. Phrae: “Near Pre, Me Ta, bamboo jungle, 240 m,” 13 February 1912, Kerr 2352 (lectotype ABD2/501!,

BM000900978!, isolectotypes K000591106!, P02953205!).

Herb, erect, 30–45 cm high; young branches terete, white puberulous. Leaves simple. Stipules cordate or lanceolate, 1.5–5 × 1–3 mm, white puberulous, persistent. Petioles 0.5–3 mm long, silvery pubescent. Lamina ovate, 0.7–5 × 0.2–2.3 cm, base cuneate, apex acute, margin entire, both surfaces white puberulous; lateral veins inconspicuous. Inflorescences leaf-opposed or axillary open racemes with 1–2 flowers, 1.5–3 cm long; peduncle 0.5–2 cm long, white puberulous. Bracts narrowly linear, 0.8–2 mm long, persistent. Pedicels 1–1.8 mm long, white pubescent. Bracteoles inserted distally on the pedicel, narrowly linear, 1–1.5 mm long, caducous. Calyx 5–6 mm long, campanulate, bilabiate; tube 0.5–1.5 mm long; lobes triangular, 2.5–4 mm long, glabrous inside, white pubescent outside. Corolla yellow. Standard: claw ca. 0.5 mm long, glabrous; blade orbicular, 3.8–4 × 3.7–3.8 mm, base rounded, apex acuminate, margin glabrous. Wings: claw 0.3–0.5 mm long, glabrous; blade oblong, 3–3.6 × 1–1.3 mm, base oblique, apex acute or obtuse, margin glabrous. Keel: claw 0.4–0.5 mm long, glabrous; blade ovate, 3–3.5 × 1.7–1.8 mm, beak spirally twisted, base oblique, apex attenuate, margin white pubescent. Stamens: filaments fused for proximal 1–1.3 mm, free for distal 1–2.5 mm; anthers either narrowly linear, 0.4–0.5 mm long or elliptic, ca. 0.1 mm long. Ovary sessile, glabrous, oblong, 1.5–2 mm long; style 2.5–2.8 mm long, adaxially white puberulous in a single line along the distal edge, abaxially glabrous. Pods sessile, oblong, 1–1.7 × 0.2–0.4 cm, brown-black, glabrous. Seeds harp-shaped, 0.8–1 × 1–1.3 mm, yellow-green.

Representative specimens: — MYANMAR. Magway: Saw Town area , 20 November 2011, Man 87865 ( QBG) . THAILAND. Chiang Mai: Doi Chiang Dao Wildlife Sanctuary , 24 April 1960, Smitinand & Alsterlund 6769 ( BKF) . Lampang: Chae Son , 12 January 1996, Maxwell 96-81 ( BKF) . Mae Hong Son: Pang Ma Pha , 19 November 2013, Lakoet 489 ( QBG) . Phayao: Chiang Kham , 21 January 2014, La-ongsri et al. 3090 ( QBG) . Phetchabun: Lom Sak , 11 October 1979, Shimizu et al. T-18327 ( BKF) . Tak: Thung Yai Naresuan Wildlife Sanctuary , 6 October 2014, Ninkaew 286 ( KKU) .

Distribution: —Asia ( Myanmar, Thailand). ( Figure 9 ).

Ecology: —Deciduous forests, elevation 370 − 1300 m.

Notes: — Crotalaria filiformis has distinctive cordate or lanceolate stipules, ovate leaves and narrowly linear bracts and bracteoles. Type specimen of C. filiformis (Wallich 5389) and C. kerrii (Kerr 2352) have more than one duplicate therefore lectotypes of both name are selected here.

Figures

FIGURE 9. Distribution map of Crotalaria dubia, C. evolvuloides and C. filiformis in continental Southeast Asia.