Lindheimer’s rock daisy

Laphamia lindheimeri A. Gray, Smithsonian Contr. Knowl. 3(5): 101. 1852; L. rotundata Rydberg; Perityle rotundata (Rydberg) Shinners

Perennials or subshrubs, (10–)18–45(–60) cm; glabrate or sparsely hairy. Leaves: petioles 4–15 mm; blades broadly ovate to ovate-lanceolate, 10–40 × 10–35 mm, margins entire or serrate-lobed. Heads in corymbiform arrays, 6–7 × 4–6 mm. Peduncles 3–20 mm. Involucres narrowly campanulate. Phyllaries 12–14, narrowly lanceolate to oblanceolate, 3–4 × 2 mm. Ray florets 3–5; corollas yellow, laminae oblong to suborbiculate, 2.5–3 × 1.5–2 mm. Disc florets 16–22; corollas yellow, tubes 0.8–1.5 mm, throats narrowly campanulate, 1–1.5 mm, lobes 0.5 mm. Cypselae linear-oblong to narrowly oblanceolate, 2–2.8 mm, margins thin-calloused, minutely hairy; pappi 0, or of 1(–2) bristles 0.5–1.8 mm.

Varieties 2 (2 in the flora): Texas.

A specimen resembling Perityle lindheimeri was collected in 1936 near Ruidosa in Lincoln County, New Mexico. The identity and exact location of that seemingly out-of-place collection remain to be determined.