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4. Polygonum sect. Cephalophilon Meisner in Wallich, Pl. Asiat. Rar. 3: 59. 1832.
头状蓼组 tou zhuang liao zu
Description from Flora of China
Plants ± prostrate, without prickles. Leaves ovate, oblong, or lyrate. Inflorescence capitate. Tepals fused for about 1/3 their length. Nectaries free, globular. Styles 1, bifid or trifid.
Between 20 and 30 species: mainly in E Asia; 17 species (six endemic) in China.
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