Echinocereus luteus

Echinocereus luteus is a species of Echinocereus. It's type locality is above Alamos, Sonora, Mexico.

Background
Stem short to elongated, sometimes branching near base, bluish green, more or less purplish, 8 or 9-ribbed; ribs rather thin, barely undulate, rounded; areoles small, 10 to 12 mm. apart; spines small, the radials 6 to 8, unequal, 2 to 8 mm. long, widely spreading, white with darker tips; central spine single, porrect; flowers on each rib appearing near top of plant and from second or third areole; flower-buds acute, reddish, covered with long, brownish bristles; areoles on ovary and flower-tube bearing white wool and light-colored spines with dark tips; flowers pale yellow, delicately sweet-scented, 7 cm. long, including the ovary; outer perianth-segments streaked with red; inner perianth-segments lemon-yellow, oblanceolate, acute; filaments light yellow. Distributed in Western Mexico.