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