Echinomastus erectocentrus var. acunensis

(W. T. Marshall) Bravo

Cact. Suc. Mex. 25: 65. 1980.

Basionym: Echinomastus acunensis W. T. Marshall Saguaroland Bull. 7: 33. 1953
Synonyms: Neolloydia erectocentra var. acunensis (W. T. Marsha ll) L. D. Benson
Treatment appears in FNA Volume 4. Treatment on page 195. Mentioned on page 194.

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.


Phenology: Flowering Mar–Apr; fruiting Apr–May.
Habitat: Arizona Upland Subdivision of Sonoran desert scrub, low gravelly hills, bajadas, and rocky hilltops, igneous substrates
Elevation: 400-800 m

Discussion

Echinomastus erectocentrus var. acunensis is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
Allan D. Zimmerman +  and Bruce D. Parfitt +
(W. T. Marshall) Bravo +
Echinomastus acunensis +
Ariz. +  and Mexico (Sonora). +
400-800 m +
Arizona Upland Subdivision of Sonoran desert scrub, low gravelly hills, bajadas, and rocky hilltops, igneous substrates +
Flowering Mar–Apr +  and fruiting Apr–May. +
Cact. Suc. Mex. +
Neolloydia erectocentra var. acunensis +
Echinomastus erectocentrus var. acunensis +
Echinomastus erectocentrus +
variety +