Stems decumbent to suberect, pale green, 0.5–1.5 dm. Her­bage usually pubescent, rarely glabrous, hairs dendritic, eglan­dular. Leaves subsessile; blade broadly lanceolate to rhombic, 2–3 × 0.6–1.5 cm, length 2–3 times width, margins entire to sinuate. Inflorescences 1–2-flowered. Flowers: calyx 3–4 mm, pubescent, especially along lobe margins; corolla 10–13 mm diam. Berries 5–7 mm diam. 2n = 72.

Phenology: Flowering Mar–Oct (mostly late spring–early sum­mer, depending on rain).
Habitat: Deserts, high grasslands.
Elevation: 300–2000 m.

Distribution

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N.Mex., Tex., Mexico (Chihuahua, Durango, Nuevo León).

Discussion

Chamaesaracha pallida is found in southeastern New Mexico and western Texas. It is most closely related to C. edwardsiana; it differs in having a relatively dense vestiture of dendritic hairs (except for a few populations in the Guadalupe Mountains that are largely glabrous), a more western distribution, and a hexaploid chromosome complement.

Selected References

None.

Lower Taxa

None.