Stiff-leaf scratchdaisy

Haplopappus rigidifolius E. B. Smith, Rhodora 67: 229. 1965, based on Isopappus divaricatus (Nuttall) Torrey & A. Gray var. hirtellus Shinners, Field & Lab. 18: 157. 1950; Croptilon divaricatum (Nuttall) Rafinesque var. hirtellum (Shinners) Shinners

Stems decumbent to erect, 20–150 cm. Cauline leaf blades spatulate to lanceolate, relatively even-sized distally, margins usually entire, sometimes serrate apically. Peduncles usually hirtellous to hispid, sometimes with crisped hairs as well, rarely glabrous, eglandular. Involucres turbinate to subcylincric, (4–)5–7 mm diam. Ray florets (5–)9–22; corolla laminae (4–)4.5–6.3(–7.4) mm. Disc florets (6–)25–45(–60). 2n = 10 (10 and 12 in one population).

Flowering Sep–Nov(–Dec). Sandy soils, creek terraces, often in prairies, fields, pastures, roadsides; 20–100 m; Tex.; Mexico (Nuevo León).