Echinomastus erectocentrus var. acunensis (W.T. Marsh.) H. Bravo
Family: Cactaceae
Acuna Cactus
Echinomastus erectocentrus var. acunensis image
Liz Makings  
Stems 4-16.5(-27) × 4-9 cm; ribs 21; areoles 15-19 mm apart along ribs. Spines 13-16 per areole, purplish pink or nearly white with brown tips; radial spines 12-15 per areole; abaxial (shortest) radial spine 11-20 × 0.42-0.59 mm; adaxial and lateral (longest) radial spines 22-37 mm; central spines ascending, (1-)2-3(-4) per areole, 19-44 × 0.6-0.8 mm, longest adaxial central spine curved toward apex of plant, sometimes slightly so; abaxial or only central spine 25-35 mm. Flowers 3.6-6 × 4-9 cm; inner tepals pale to bright rose-pink, proximally blotched orangish brown, chestnut, maroon, or greenish brown, (2-)3-4.3 × 0.7-1.8 cm; stigma lobes red to brownish red, papillae red to green. 2n = 22. Flowering Mar-Apr; fruiting Apr-May. Arizona Upland Subdivision of Sonoran desert scrub, low gravelly hills, bajadas, and rocky hilltops, igneous substrates; 400-800 m; Ariz.; Mexico (Sonora). Echinomastus erectocentrus var. acunensis is in the Center for Plant Conservation´s National Collection of Endangered Plants.

Echinomastus erectocentrus var. acunensis image
Liz Makings  
Echinomastus erectocentrus var. acunensis image
Liz Makings  
The National Science Foundation
This project made possible by National Science Foundation Award 1410069