Amer. Naturalist7: 302. 1873
Common names: Desert sand-verbena
Found in FNA Volume 4. Treatment on page 66. Mentioned on page 62, 67, 6.
Plants annual. Stems decumbent to ascending, often widely spreading, much branched in large plants, forming large, loose mats, elongate, usually with reddish tinge, glandular-pubescent to long viscid-villous. Leaves: petiole 0.5–5 cm; blade deltate-ovate to ovate or elliptic, 1–5 × 1–4.5 cm, margins entire to sinuate and ± undulate, adaxial surface glabrous or glandular-pubescent, abaxial surface glandular-pubescent. Inflorescences: peduncle longer than subtending petiole; bracts lanceolate to lance-ovate, 2.5–11 × 1–3 mm, papery, viscid-villous; flowers 15–35. Perianth: tube pink, 10–35 mm, limb usually magenta, with light eyespot, rarely white, 6–18 mm diam. Fruits usually winged, ± obdeltate in profile, 5–10 × 4–15 mm, indurate, ± rugose-veined, sometimes inconspicuously so; wings 3–5, not folded, without dilations, thin, truncate distally, equaling or extending slightly beyond conic apex of fruit body, interior spongy.