Wrightia 1: 71. 1946.
Annuals, 8–40 cm, eglandular or minutely glandular; taprooted. Leaves not densely overlapping, proximal and mid cauline blades oblanceolate to oblong-spatulate, 7–35 × (1–) 2–10 mm, herbaceous, bases not clasping, flat, faces glabrous or sparsely strigose. Involucres narrowly to broadly conic, 3.8–4.5 × 1.5–2.5 mm. Ray-florets 6–15; corollas violet to blue or lavender. Disc-florets 8–22, bisexual or functionally staminate. Cypselae (ray) 1.5–2.2 mm, 10-nerved, faces strigose; pappi minute, thickened rings less than 0.1 mm, in 1 series. 2n = 16.
Phenology: Flowering late Mar–Jul.
Habitat: Open habitats, sandy, clay, or rocky soils, commonly in calcareous alluvium, stream bottoms, limestone hills, usually with juniper and oak
Elevation: 200–700 m
"thick" is not a number.