Echinocereus hempelii

Echinocereus hempelii is a species of Echinocereus. It's type locality is Mexico.

Background
Plant, so far as known, simple, erect, 1.5 dm. long or more, 6 to 7 cm. in diameter, dark green; ribs 10, strongly tuberculate; radial spines 6, spreading, white with brown tips, acicular, 1 cm. long or less; central spines none; flowers from near the top of plant, rather large, 6 to 8 cm. broad, violet; inner perianth-segments few, about 14, loosely arranged, oblong, 3 cm. long, strongly toothed above; style longer than the stamens; ovary bearing conspicuous red scales, spiny; fruit not known. Distribution known only from cultivated plants.