187m.20. Asteraceae Martinov (tribe Heliantheae) subtribe Peritylinae Rydberg in N. L. Britton et al., N. Amer. Fl. 34: 11. 1914.
Annuals, perennials, subshrubs, or shrubs, 2–45(–75) cm. Leaves cauline; opposite or alternate; petiolate or sessile; blades mostly deltate to ovate or lanceolate overall, sometimes cordate, linear, reniform, rhombic, orbiculate, or ovate, often 3-lobed to pinnatisect, ultimate margins subentire to doubly serrate, faces glabrous or hairy, usually gland-dotted. Heads radiate or discoid, borne singly or in corymbiform arrays. Calyculi 0. Involucres cylindric to campanulate or hemispheric. Phyllaries persistent, 8–21 in 1(–3) series (distinct or connate, ovate to obovate or linear, subequal, often conduplicate, herbaceous, margins scarious). Receptacles flat or convex, epaleate. Ray florets 0 or 8–12 pistillate, fertile; corollas yellow or white. Disc florets 5–100+, bisexual, fertile; corollas yellow or white, tubes shorter than or about equaling cylindric to funnelform or campanulate throats, lobes 4, deltate (equal); anther thecae pale; stigmatic papillae in 2 lines. Cypselae linear or cuneiform to oblong or oblanceolate, strongly flattened or weakly 3–4-angled (callous-margined, usually ciliate); pappi 0, or persistent or falling, vestigial, or of 8–12 linear to subulate, laciniate or fimbriate scales, sometimes 1–2(–4) scales aristate, or of 1–2(–6) or 8–35 bristles.
Genera 5, species 67 (2 genera, 36 species in the flora): sw United States, Mexico, South America (1 species).
Peritylinae appears to be relatively isolated among epaleate Heliantheae (H. Robinson 1981). B. G. Baldwin et al. (2002) included Lycapsus Philippi in Peritylinae.