Proc. Amer. Acad. Arts 21: 418. 1886. 1886
Herbs, annual, or subshrubs, to 2 m. Stems erect, usually reddish or purplish, minutely glandular-pubescent to glabrate, without simple hairs, obscurely viscid. Leaves: stipules lost early and seldom observed, subulate; petiole subequal to blade; blade markedly discolorous, broadly round-ovate, 8–10 (–20) cm, ± as long as wide, base deeply cordate, margins obscurely serrulate, apex acuminate, surfaces softly pubescent. Inflorescences terminal panicles. Flowers: calyx 3–6 mm, lobes not overlapping, not reflexed in fruit, lanceolate-ovate, to 8 mm wide; corolla pale-yellow throughout, petals 9–15 mm; staminal column glabrous; style 10-branched. Schizocarps globose, 7–10 mm; mericarps: apex rounded or obtuse, stellate-tomentose. Seeds 3 per mericarp, 2.5–3 mm, sparsely reticulately scabridulous.
Phenology: Flowering late summer.
Habitat: Arid hillsides, along water courses
Elevation: 1000–1500 m
Abutilon reventum ranges in western Mexico from Chihuahua and Sonora to Oaxaca. It is also found at adjacent sites in Pima County, southern Arizona.