Texas Western Daisy

Astranthium robustum is known only from the trans-Pecos region.

Annuals, taprooted. Stems usually 3–8, decumbent-ascending, sometimes 1, erect. Leaves: basal and proximal cauline 20–45 × 5–11 mm. Involucres 4–6.8 mm. Ray florets 18–35; corolla laminae white or abaxially lavender, often drying pinkish, 8–13 mm. Disc floret corollas 3.2–3.8 mm. Cypselae 1.4–2.1 × 0.7–1.2 mm, faces minutely, glandular-papillate-pebbly, uniformly sparsely to moderately glochidiate-hairy. 2n = 6.

Astranthium integrifolium var. robustum Shinners, Field & Lab. 18: 158. 1950

Astranthium robustum, the Texas western-daisy, is a North American species of flowering plants in the family Asteraceae. It is found only in the western (trans-Pecos) part of the US State of Texas.

Astranthium robustum is an annual with a taproot, and usually with several stems up to 50 cm (20 inches) tall. Flower heads have white or bluish ray florets and yellow disc florets.