Echinocereus roetteri

Echinocereus roetteri is a species of Echinocereus. It's type locality is near El Paso, Texas.

Background
Cespitose, or perhaps sometimes simple and occasionally budding above, 1 to 2.5 dm. high; ribs 13, straight, more or less undulate; areoles circular, or a little longer than broad, about 1 cm. apart; radial spines 15 to 17, acicular, about 1 cm. long, white or purplish; central spines 1 to 5, not in a single row, a little stouter but scarcely longer than the radials; flowers appearing below the top of the plant, large, 6 to 7 cm. long, perhaps even broader than long, light purple; outer perianth-segments greenish yellow; inner perianth-segments oblanceolate, acute, 3 to 4 cm. long; ovary and fruit spiny. Distributed in Southwestern Texas; Chihuahua, near El Paso, and southeastern New Mexico.