Siemssenia capillaris

Wiry much-branched annual to c. 45 cm high; stems glabrous except for cobwebbed hairs in leaf-axils. Leaves glabrous, basal ones oblanceolate to elliptic, to c. 5 cm long, to c. 10 mm wide, soon withering; cauline leaves linear, 0.5–4 cm long, 1–1.5 mm wide, obtuse. Capitula campanulate, 3–6 mm diam., in loose cymes; peduncles mostly 1–4 cm long, naked below involucre; involucral bracts ovate, greenish with scarious margins, indented about half way along each side, entire, glabrous, shiny; intermediate bracts 3.5–5 mm long, claw with scarious margins and longer than lamina; inner bracts long-clawed. Florets white, c. as long as involucre; ray florets 9–12, ligules 2–2.5 mm long, often with a purple line; disc florets 17–22, corolla asymmetric, split down one side. Cypselas c. 1 mm long; pappus bristles 15–18, free, 1–2 mm long, absent from ray cypselas. Flowers Aug.–Mar.