12. Senna surattensis (N. L. Burman) H. S. Irwin & Barneby, Mem. New York Bot. Gard. 35: 81. 1982.
黄槐决明 huang huai jue ming
Cassia surattensis N. L. Burman, Fl. Indica, 97. 1768.
Shrubs or small trees, 5-7 m tall. Bark grayish brown, smooth; young branches, petioles, and rachises of leaves puberulent. Leaves 10-15 cm, with 2 or 3 clavate, long glands 1-2 mm on rachis between lowest 2 or 3 pairs of leaflets and in upper part of petiole; stipules subpersistent, linear, 5-10 mm; leaflets 6-9 pairs, abaxially farina-white, ovate to ovate-oblong, 2-5 × 1-1.7 cm, abaxially sparsely pubescent, adaxially glabrous, base rounded, apex rounded, slightly emarginate. Racemes in axils of apical leaves, 3-6 cm, 10-15-flowered; peduncles 2.5-5 cm; bracts ovate-oblong, 5-8 mm, outside puberulent, finally reflexed. Pedicels 1-2 cm. Sepals unequal, 2 outer suborbicular, ca. 3 mm in diam., 3 inner obovate, to 7 mm. Petals bright yellow to deep yellow, subequal, ovate to obovate, 1.5-2 cm, with long claw 1-1.5 mm. Stamens 10, all fertile, with short, thick filaments, lowest 2 filaments longer; anthers oblong, subequal, 5-7 mm, opening by apical slits. Ovary puberulent; style glabrous. Legume flat, strap-shaped, dehiscent, 7-10 × 0.8-1.5 cm, long slender beaked, valves papery. Seeds 10-25, glossy, flattened. 2n = 48, 56.
Cultivated in Fujian, Guangdong, Guangxi, ?Hainan, Taiwan, ?Yunnan, ?Zhejiang [native to India; widely introduced and cultivated elsewhere].