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IBSC | Family List | Angiospermae | Commelinaceae

Commelina Linn.

鸭跖草属

Description from Flora of China

Herbs annual or perennial. Rhizomes absent. Stems creeping, ascending, or erect. Leaves alternate. Cincinni subtended by and included in spathelike involucral bracts; involucral bracts open or proximal margins coherent and becoming funnelform, often forming heads; cincinni dichotomously branched, flowers in 1 branch smaller, infertile, falling early, those in other branch fertile; bracts not falcate curved, usually extremely small or absent. Flowers zygomorphic. Sepals lanceolate or ovate-orbicular, sometimes shallowly boat-shaped, inner 2 often connate at base. Petals free, blue, spatulate or orbicular, inner (anterior) 2 larger and clawed. Fertile stamens 3, on 1 side, 2 inserted opposite sepals, 1 opposite petal; filaments glabrous; staminodes 3; antherodes 4-lobed, butterflylike. Ovary 2- or 3-loculed, posterior locule with 1 developed or abortive ovule or empty, anterior 2 locules each with 1 or 2 ovules. Capsule oblong, globose, or ellipsoid, 3- or most frequently 2-valved; posterior valve 1-seeded or seedless, often indehiscent; anterior 2 valves each seedless or 1- or 2-seeded. Seeds cylindric or ellipsoid, reticulate or subsmooth; hilum linear.

About 170 species: mainly in tropical and subtropical regions; eight species in China.


 

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