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FOC | Family List | FOC Vol. 10 | Fabaceae

84. Apios Fabricius, Enum. 176. 1759.

土圞儿属 tu luan er shu

Authors: Ren Sa & Michael G. Gilbert

Herbs, twining, with root tubers. Leaves pinnately (3 or)5- or 7(or 9)-foliolate; stipels small. Inflorescence axillary or subter­minal and grouped into terminal panicle, racemelike; nodes swollen. Bracts and bracteoles small, caducous. Calyx campanulate; lobes shorter than tube, upper 2 connate, lowest 1 linear and other 2 much shorter. Standard ovate or circular, reflexed; wings obliquely obovate, shorter than standard; keels longest and inflexed or coiled. Stamens diadelphous; vexillary stamen free; anthers uniform. Ovary subsessile; ovules many, upper part reflexed, usually thickened, glabrous; stigma terminal. Legume linear, almost fal­cate, dehiscent, compressed, 2-cleft. Seeds without strophiole.

About eight species: mostly in E Asia, two species in E North America; six species (four endemic) in China.

1 Flower red, reddish purple, or orange; leaflets usually more than 5 cm.   6 A. carnea
+ Flower green, yellow, or purple; leaflets usually less than 5 cm   (2)
2 (1) Leaflets 0.5-1.9 cm wide; inflorescences shorter than or subequal to leaves   (3)
+ Leaflets usually more than 2 cm wide; inflorescences longer than leaves   (4)
3 (2) Leaflet 0.5-1.2 cm wide; flowers purple.   5 A. gracillima
+ Leaflet 1.1-1.9 cm wide; flowers pale yellow.   4 A. delavayi
4 (2) Leaflets ovate or rhomboid-ovate, usually 3-7.   1 A. fortunei
+ Leaflets usually lanceolate, narrowly lanceolate, or ovate-lanceolate, 5 or 7   (5)
5 (4) Leaflets lanceolate to ovate-lanceolate; inflorescence with 2 flowers per node.   2 A. macrantha
+ Leaflets ovate-lanceolate to ovate; inflorescence with 3 or 4 flowers per node.   3 A. taiwaniana

Lower Taxa


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