Roundleaf Snakeweed

Annuals, 20–50 cm. Stems minutely, prominently, often sparsely, papillate-scabrous (hairs triangular or deltate to lanceolate, less than 0.1 mm). Leaves: proximal usually absent at flowering; cauline blades 1-nerved, linear, 0.5–1.2 mm wide, little reduced distally. Heads in loose arrays. Involucres campanulate, 2.5–5 mm diam. Phyllary apices flat. Ray florets 10–15; corollas yellow, 3–5.5 mm. Disc florets 18–37. Cypselae 0.9–1.2(–1.4) mm, faces without oil cavities, densely strigoso-sericeous in rows (hairs appressed to spreading, apices clavate); pappi of 1 series of narrowly triangular or narrowly oblong scales 0.2–1 mm (distinct or basally connate ¹ / 4 – ³ / 4 their lengths, usually shorter in rays). 2n = 8 (10).

Gutierrezia eriocarpa A. Gray; Xanthocephalum sphaerocephalum (A. Gray) Shinners; Xanthocephalum sphaerocephalum var. eriocarpum (A. Gray) Shinners

Gutierrezia sphaerocephala là một loài thực vật có hoa trong họ Cúc. Loài này được A.Gray mô tả khoa học đầu tiên năm 1849.