Dalea bartonii
Mem. New York Bot. Gard. 27: 239, plate 54. 1977. (as bartoni)
Perennial herbs, erect, glabrous proximal to inflorescences. Stems 1.2–2.5 dm, gland-dotted. Principal leaves 0.8–2(–2.3) cm; leaflets 5–9, blades obovate-cuneate, 2.5–7.5 mm. Peduncles 0.1–0.6 cm. Inflorescences spikes, ± densely flowered, not involucrate, 8 mm diam.; axis not visible, 0.3–1.4 cm; bracts early deciduous or proximal ones persistent, 2–3 mm. Calyces somewhat asymmetric, slightly recessed opposite banner, 3.8–4.3 mm, glabrous; tube 2.8–3.5 mm, with 3–8+ blister glands between ribs, lobes triangular-subulate or adaxial pair triangular-acuminate. Corollas white; not conventionally papilionaceous; banner 5.4 mm, blade deltate-obcordate, 2.5 × 3 mm; epistemonous petals attached at separation of filaments, blades 3 × 1.5 mm. Stamens 5, 9.5 mm, filaments distinct to 4.5 mm, anthers unknown. Legumes 2.8 mm, sparsely pubescent along abaxial side, densely so at base of style, gland-dotted. Seeds 2 mm.
Phenology: Flowering summer.
Habitat: Limestone soils.
Elevation: 1000–1100 m.
Distribution
Tex.
Discussion
Dalea bartonii is known only from the type locality in Brewster County, although a vegetative specimen from adjacent Terrell County was annotated as D. bartonii by B. L. Turner.
Dalea bartonii was assigned by D. K. Wemple (1970) to D. sabinalis (as Petalostemon sabinalis), but R. C. Barneby (1977c) considered it closer to D. scariosa and could not readily accommodate it in his concept or either D. scariosa or D. sabinalis. The known specimens were collected in July but were in late flower and early fruit, indicating that the peak of bloom was earlier.
Selected References
None.