Dalea purpurea var. arenicola

Title

Dalea purpurea var. arenicola

Authors

Rupert C. Barneby

Scientific Name

Dalea purpurea var. arenicola (Wemple) Barneby

Description

46b.  Dalea purpurea Ventenat var. arenicola (Wemple) Barneby

(Plate LVIII)

Closely resembling smaller forms of var. purpurea except in the narrow and usually pedunculate spikes; stems up to 2-4.5 dm long; foliage glabrous or nearly so; peduncles, at least of central or primary spikes, 3-15 cm long; spikes 7-8.5 mm diam, the axis 1-4 (5) cm long; 2n = 14 (Wemple, 1970, p. 12). — Collections: 25 (iii).

Sandy bluffs, dunes, and sandy alluvial flats along streams or dry watercourses, 570-1300 m (1900-4330 ft), locally abundant on the Staked Plains and short-grass prairies drained by the upper Red and Canadian rivers in n.-w. Texas, immediately adjacent New Mexico, and far w. Oklahoma, in Texas s. to the sources of the Colorado and Concho rivers, n. through the s.-w. quarter of Kansas drained by the Cimarron and Arkansas rivers and extreme e. Colorado on the upper Republican and Frenchman rivers to the forks of the Platte in w. Nebraska, there passing into var. purpurea.—Flowering (May) June to August .—Representative: Colorado: Ripley & Barneby 10,164 (NY); Stephens & Brooks 24,075 (NY). Kansas: Rydberg & Imler 718, 926 (NY); Barneby 14,986 (CAS, IA, NY), 14,987 (NY). Oklahoma: Waterfall 8970, 9055 (NY). Texas: Reverchon 3007 (NY); Ferris & Duncan 3360, 3510 (NY). New Mexico: Goodman & Hitchcock 1116 (NY, UC).

Dalea purpurea Ventenat var. arenicola (Wemple) Barneby, stat. nov., based on Petalostemon arenicola (dwelling on sand) Wemple, Iowa State Jour. Sci. 45(1): 94, figs. 8 (phototype), 11, I (petals), 12, D + map 13. 1970. — "Typus, ISC (Wemple 319)." — Holotypus, collected on stabilized dunes 5.5 mi s. of Lakin, Kearney Co., Kansas, June 11, 1963, seen only in photograph cited; iso typus, NY!