Echinocereus pentalophus
Description:
A somewhat sprawling, pale to dark green plant with stems 4-6 inches long and 3/4 inch thick, and four to fine ribs set with whitish areoles. The yellowish or whitish spines are all radials, to 3/4 inches in length. Flowering early to mid-summer, the flowers are diurnal, lilac to carmine, and up to 4 inches across.