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7. Astragalus sect. Onycholobium Pomel, Bull. Soc. Sci. Phys. Algérie. 11: 189. 1874.
胡麻组 hu ma zu
Plants annual, mostly branched at base, with basifixed hairs. Stipules shortly adnate to petiole. Racemes sessile or pedunculate, ± densely capitate. Petals of unequal length. Legumes sessile, at base mostly distinctly widened to bigibbous, keeled ventrally, deeply grooved dorsally, groove often widened toward base, mostly fully 2-locular.
Twenty-four species: N Africa, SW Asia to Pakistan and China, S Europe; four species in China.
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| 1 |
Stems, petiole, and rachis closely appressed hairy |
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(2) |
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Stems, petiole, and rachis at least in part with ascending to spreading hairs |
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(3) |
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| 2 (1) |
Calyx 3-4 mm; bracts 1-1.5 mm; legumes 6-10 mm, with wrinkled walls, covered with short subappressed hairs and spreading hairs up to 1.5 mm. |
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11 A. filicaulis |
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Calyx 5.5-7 mm; bracts 2-3 mm; legumes 12-15 mm, covered with subappressed to ascending hairs up to 1.3 mm. |
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13 A. sesamoides |
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| 3 (1) |
Calyx 2.5-3 mm; leaflets adaxially glabrous; legumes widest at base but not bigibbous. |
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12 A. persepolitanus |
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Calyx 3-5 mm; leaflets on both surfaces densely appressed hairy; legumes at base distinctly bigibbous. |
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14 A. tribuloides |
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