Perennials or subshrubs. Stems decumbent, erect, prostrate, or trailing, sometimes rooting at nodes, mat-forming, sericeous. Leaves petiolate; blade elliptic to lance-elliptic, 6–14 mm, surfaces sericeous. Inflorescences: flowers solitary, subsessile. Flowers: sepals: outer ovate-lanceolate, 2.5–4(–6) mm, inner lanceolate-acuminate, 2.5–3(–5) mm; corolla greenish yellow to yellow, ± campanulate, 3–4 mm, limb 5-lobed; styles 2, distinct or connate from base to 1/2 length; stigmas globose. Fruits capsular, globose, dehiscence valvate. Seeds (1–)4, ellipsoid to trigonous, glabrous.

Distribution

Texas, n Mexico.

Discussion

Species 1.

This treatment follows S. Stefanović et al. (2003), who recognized Petrogenia as a monospecific genus, whereas D. F. Austin and G. W. Staples (1985) synonymized it under Bonamia.

Selected References

None.

Lower Taxa

Petrogenia repens