任豆Zenia insignis Chun

别名：科尚;任木;光杠;米杠;四料木;砍头树;翅荚木;赤荚木;米扛;翅英木;米杠尚;翅荚豆;

科名：豆科 Leguminosae

属名：任豆属 Zenia

《中国植物志》第39卷121页
  1.任豆 任木 图版41: 1-10
  Zenia insignis Chun in Sunyatsenia 6: 196. 1946; 中国主要植物图说——豆科72, 图73. 1955.
  乔木，高15-20米，胸径约1米；小枝黑褐色，散生有黄白色的小皮孔；树皮粗糙，成片状脱落。芽椭圆状纺锤形，有少数鳞片，初时被黄色柔毛，后渐脱落。叶长25-45厘米；叶柄短，长约3-5厘米；叶轴及叶柄多少被黄色微柔毛；小叶薄革质，长圆状披针形，长6-9厘米，阔2-3厘米，基部圆形，顶端短渐尖或急尖，边全缘，上面无毛，下面有灰白色的糙伏毛；小叶柄长2-3毫米。圆锥花序顶生；总花梗和花梗被黄色或棕色糙伏毛；花红色，长约14毫米；苞片小，狭卵形，早落；萼片厚膜质，长圆形，稍不等大，长10-12毫米，阔5-6毫米，顶端圆钝，外面有糙伏毛，内面无毛；花瓣稍长于萼片，长约12毫米，最上面一片阔8毫米，倒卵形，其他的阔5-6毫米，椭圆状长圆形或倒卵状长圆形；雄蕊的花丝长3毫米，被微柔毛，花药长6毫米，宽1毫米；子房通常有胚珠7-9颗，边缘具伏贴疏柔毛，子房柄长4毫米。荚果长圆形或椭圆状长圆形，红棕色，通常长约10厘米，有时可达15厘米，宽2.5-3.5厘米，翅阔5-6毫米；种子长4-9毫米，阔7毫米，圆形，平滑，有光泽，棕黑色；珠柄丝状，长4毫米。花期5月；果期6-8月。
  分布于广东、广西。生长于海拔200-950米的山地密林或疏林中。越南有分布。模式标本采自广东乐昌。

《Flora of China》 Vol. 10 (2010)
Zenia insignis  Chun Sunyatsenia. 6: 196. 1946.
任豆   ren dou
Trees, 15-20 m tall. Trunk to 100 cm d.b.h. Branchlets blackish brown, with scattered, yellowish white, small lenticels. Bark rough, exfoliating in strips. Buds elliptic-fusiform, with few scales, yellowish pubescent at first, glabrescent. Leaves 25-40 cm; petiole short, 3-5 cm; rachis and petiole ± yellowish puberulent; petiolules 2-3 mm; leaflets oblong-lanceolate, 6-9 × 2-3 cm, thinly leathery, abaxially grayish white strigose, adaxially glabrous, base rounded, margin entire, apex shortly acuminate or acute. Panicles terminal; peduncles and pedicels yellow or brown strigose. Flowers red, ca. 1.4 cm; bracts caducous, narrowly ovate, small. Sepals oblong, slightly unequal in size, 10-12 × 5-6 mm, thickly membranous, outside strigose, inside glabrous, apex rounded. Petals slightly larger than sepals, ca. 1.2 cm, uppermost one obovate, ca. 8 mm wide, others ellip-tic-oblong or obovate-oblong, 5-6 mm wide. Filaments ca. 3 mm, puberulent; anthers ca. 6 × 1 mm. Ovary 7-9-ovuled, mar-gin adpressed pilose; stalk ca. 4 mm. Legume reddish brown, oblong or elliptic-oblong, usually ca. 19 cm, sometimes to 15 × 2.5-3.5 cm; wing 5-6 mm wide. Seeds brownish black, shiny, 4-9 × ca. 7 mm, smooth; funicle filiform, ca. 4 mm. Fl. May, fr. Jun-Aug. 2n = 28*.
Dense or sparse forests, mountain slopes; 200-1000 m. Guang-dong, Guangxi, ?Yunnan [Vietnam].