Edwards Plateau five eyes

Stems decumbent to suberect, purplish or greenish gray, 0.7–3 dm. Herbage glabrous or gla­brate, hairs usually dendritic, sometimes simple, eglandular. Leaves subsessile; blade linear-lanceolate to rhombic, 2.5–7 × 0.7–1.5 cm, length 3.5–4.5 times width, margins occasion­ally few-lobed. Inflorescences 1–2-flowered. Flowers: calyx 4–5 mm, pubescent, especially along lobe margins; corolla 10–15 mm diam. Berries 5–8 mm diam. 2n = 48.

Flowering Mar–Oct (mostly late spring–early sum­mer, depending on rain). Roadsides, limestone soils; 0–700 m; Tex.

Chamaesaracha edwardsiana occurs in the Edwards Plateau region of central Texas. J. E. Averett (1973) mapped a few populations in northern Mexico but most of those may belong with C. pallida. Chamaesaracha edwardsiana is most closely related to C. coronopus but differs in having broader, entire or nearly entire leaves. The species is similar also to C. pallida but lacks the relatively dense dendritic hairs on the leaves and has a generally more eastern distribution.