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18. Polycnemum Linnaeus, Sp. Pl. 1: 35. 1753.
多节草属 duo jie cao shu
Herbs annual or subshrubs. Leaves alternate, sessile, subulate. Flowers solitary in leaf axils, minute, bisexual; bracteoles 2, scarious. Perianth segments 5, free. Stamens (1-)3(-5), inserted on an annular, hypogynous disk. Stigmas 2; style extremely short. Fruit a utricle; pericarp thin, scarious, indehiscent. Seed vertical, black when ripe; testa leathery, granulate; embryo annular; perisperm present.
Between six and eight species: C Asia and Siberia, Europe; one species in China.
Lower Taxon
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