Sida 12: 239, fig. 1. 1987.
Stems (when present) 1–2 dm. Basal leaves: petiole 1.5–4 cm; blade 3.5–5 cm, lobes 0–4 on each side, margins shallowly dentate, terminal lobe transversely broadly oblong, 0.6–0.7 cm × 8–11 mm, (distinctly shorter than wide), considerably larger than lateral lobes, margins slightly lobed or shallowly dentate. Fruiting pedicels: solitary flowers 30–70 mm; racemes 20–40 mm. Flowers: sepals widely spreading, oblong-linear, 3.9–4.5 × 1.4–1.8 mm; petals spreading, bright yellow, narrowly obovate, 7.3–9 × 2–3 mm, claw dark yellow, 2.6–3.3 mm, apex shallowly emarginate, apical notch 0.1–0.3 mm deep; filaments: median 4–4.5 mm, lateral 2.2–2.5 mm; anthers 0.8–1.3 mm. Fruits oblong, 1.5–2.3 cm × 4–5 mm, smooth, latiseptate, (margined); valves thin; ovules 4–14 per ovary; style 1.7–3 mm. Seeds 3–3.5 mm diam.; wing 0.2–0.4 mm wide; embryo straight. 2n = 22.
Phenology: Flowering Mar–Apr.
Habitat: Pastures, seepage areas of rock outcrops
Elevation: 70-150 m
Of conservation concern.
Leavenworthia texana is known only from San Augustine County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.
Rollins reduced Leavenworthia texana to a variety of L. aurea. The differences in petal color, shape and margin of the terminal lobe, and chromosome number clearly support recognition as distinct species.