Proc. Amer. Acad. Arts 22: 296. 1887.
[Herbs] shrubs, hairy. Stems erect, stellate-tomentose or stellate-scabrous. Leaves petiolate to sessile distally; stipules deciduous, linear to subulate; blade ovate to triangular or lanceolate to included, anthers at apex; ovules 1 per cell, 1–3 per carpel; styles 6–11-branched; stigmas capitate. Fruits schizocarps, sometimes on reflexed, jointed pedicel, spheric to subspheric, indurate; mericarps [6–]9 or 10[or 11], ± 2-celled, winged, flared at papery apex, lower cell rugose, stellate-hairy, sparsely hirsute, indehiscent, endoglossum absent, upper cell smooth, dehiscent apically. Seeds 1 in rugose portion, 1 or 2 apically, sometimes abortive, glabrous or minutely hairy. x = 15.
sw United States, nw Mexico.
Species 4 (2 in flora).