Aphanostephus skirrhobasis var. kidderi
Phytologia 56: 94. 1984.
Plants (10–) 15–35 cm. Stems erect to decumbent, hirsuto-pilose and/or puberulent, hairs (0.2–) 0.5–1.2 mm. Leaves not strongly thickened or felty gray-hairy. Ray-florets 1–9–40. Pappi of acute or awn-tipped or setiform scales 0.4–2 mm. 2n = 6.
Phenology: Flowering Mar–Jun(–Aug).
Habitat: Sandy or gravelly soils, often in matorral and scrublands
Elevation: 0–50 m
Tex., Mexico (Tamaulipas)
Apparent intergrades between var. kidderi and var. skirrhobasis are relatively common. There is a greater tendency in Aphanostephus skirrhobasis for leaves to be lobed or pinnatifid over the whole stem than in the other species.