Echinocereus dubius

Echinocereus dubius is a species of Echinocereus.

Background
Somewhat cespitose; stems 12 to 20 cm. long, pale green, of a soft flabby texture, 7 to 9-ribbed; ribs broad; spines white; radial spines 5 to 8, 12 to 30 cm. long; centrals 1 to 4, 3-5 to 7.5 cm. long, angled, often curved; flowers pale purple, 6 cm. long or more, with rather few and narrow perianth-segments; scales on flower-tube bearing 1 to 3 white bristles in their axils; fruit very spiny, 2.5 to 3 cm. long; seeds covered with confluent tubercles.