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61. Stylosanthes Swartz, Prodr. 7, 108. 1788.
笔花豆属 bi hua dou shu
Shrublets or perennial herbs. Stems erect or spreading, with sparse glandular trichomes. Stipules sheathlike, adnate to petiole, not spurred, persistent. Leaves pinnately 3-foliolate; leaflets subsessile. Inflorescences terminal or axillary spikes, with small clustered flowers; bracts membranous, persistent. Bracteoles lanceolate, membranous, persistent. Hypanthium long. Calyx tubular, 5-lobed; abaxial lobe narrow and distinct, adaxial 4 lobes connate. Corolla yellowish orange; standard orbicular, broadly ovate, or obovate, without an auricle, base narrowly cuneate, apex emarginate; wings oblong to obovate, shorter than standard, distinct, auriculate; keels similar to wings. Stamens 10, monadelphous, basal part closed or tubular; anthers dimorphic, alternate with longer 5 almost basifixed and shorter 5 dorsifixed. Ovary linear, sessile, with 2 or 3 ovules; style thin and straight; stigma terminal, calyptriform, extremely small. Legume a loment, oblong to ellipsoid, small, depressed, without a stipe, with coarse reticulate veins, often tuberculate, with 1 or 2 articles, indehiscent, apex with a beak. Seeds ovoid or reniform; hilum usually oblique, with a prominent radicle lobe.
About 25 species: tropical and subtropical Africa, America, and Asia; two species (both introduced) in China.
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Inflorescences with each flower not subtended by a rudimentary axis; legume ovoid, 2-3 × ca. 1.8 mm, glabrous or near apex pubescent, with 1 article, beak 0.1-0.5 mm, inflexed. |
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1 S. guianensis |
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Inflorescences with each flower subtended by a rudimentary axis; legume quadrate, 2-3.5 × ca. 2 mm, commonly pubescent, with 2 articles, beak 3-3.5 mm, uncinate. |
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2 S. hamata |
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Lower Taxa
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