Herbs , annual, caulescent, taprooted; sap not milky. Leaves alternate; stipules caducous, free. Leaf blade broadly ovate, margins toothed; venation nearly palmate. Inflorescences axillary, capitate cymes, short-pedunculate, bracteate. Flowers: staminate and pistillate on same plants. Staminate flowers: calyx 4-lobed; stamens 4, inflexed. Pistillate flowers: calyx green, 4-lobed, pubescent; ovary superior, oblique, 1-locular; style unbranched, nearly lateral. Syncarps globose; each achene surrounded by its enlarged, persistent calyx.
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Citation: The vPlants Project. vPlants: A Virtual Herbarium of the Chicago Region. http://www.vplants.org
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The Morton Arboretum, The Field Museum, Chicago Botanic Garden, Additional Partners
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