Gentes Herbarum 11: 337, figs. 3 – 5. 1978.
Subshrubs, herbage usually hairy, often viscid. Stems erect or spreading. Leaves: stipules caducous, filiform; blade ovate to subround, unlobed or 3-lobed, base cordate [obtuse or subtruncate], margins toothed. Inflorescences axillary and solitary flowers or cymes or terminal and racemes or panicles; involucellar bractlets absent. Flowers: calyx [5–]8–13.5[–apex]; filaments terminal and subterminal; ovary 5-carpellate; ovules 3 per carpel, pendulous or horizontally pendulous, 2 collateral in upper carpel cell, 1 in lower carpel cell; style 5-branched; stigmas capitate. Fruits schizocarps (± functionally capsular), erect, not inflated, turbinate, 5-lobed, starlike in cross section, papery to indurate, hairy; mericarps 5, 2-celled, lower cell ± trapezoidal, 1-seeded, upper cell angular-orbiculate, collaterally 2-seeded, cells sometimes separated by endoglossum. Seeds obovoid-reniform, glabrous. x = 8.
sc United States, Mexico.
Species 9 (2 in the flora).