Pachycarpus

Perennial herbs, erect, often robust, with tuberous rootstock or fusiform roots. Leaves petiolate or subsessile, usually distinctly penninerved. Flowers in 2-several-flowered umbels, lateral at nodes. Sepals usually with scales within base, usually ciliate, often pilose. Corolla usually deeply 5-lobed, sometimes with broadly campanulate tube. Corona arising at or from near base of staminal column, of 5 lobes; lobes shorter to longer than staminal column or nearly as long as corolla, erect or deflexed or inflexed over style head, often shortly and thickly stalked, dorsally flattened, spatulate, oblong-spatulate, broadly ovate, obovate, oblong, sometimes bluntly 3-lobed or produced into a linear lobe, usually with 2 flaps on inner face, sometimes attached by a broad foot to staminal column and consisting of 2 fleshy keels separated by a deep, narrow fissure. Anthers 2-locular, with membranous appendages usually resting on style head. Pollinia oblong or ovate-oblong, pendulous, caudicles usually shorter than pollinia. Style head crater-like, depressed-truncate or dome-like. Follicles usually solitary by abortion, +/- fusiform, obtuse, winged at least in upper part, sometimes toothed or echinate along wings. Seeds brown, oblong, convex on back, concave on face with thickened margin, covered with short protuberances. x = 11 (1 report).