Echinomastus erectocentrus var. acunensis

(W. T. Marshall) Bravo

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

Basionyms: 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.

1.3 cm13 mm <br />0.013 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
2.2 cm22 mm <br />0.022 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
cushionlike +
circular to linear +
deciduous +  and persistent +
hourglass--shaped +
1.5 cm15 mm <br />0.015 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
Allan D. Zimmerman +  and Bruce D. Parfitt +
(W. T. Marshall) Bravo +
hardened +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
olive-green +  and orangish brown chestnut or maroon +
2.5 cm25 mm <br />0.025 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
Echinomastus acunensis +
triangular +
curved +  and straight +
19mm +  and 44mm +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
proliferating +
flattened +  and cylindric +
mucilaginous +
firm +  and hard +
connected +
divided +  and notched +
Ariz. +  and Mexico (Sonora) +
400-800 m +
not separating +
3.6 cm36 mm <br />0.036 m <br /> (6 cm60 mm <br />0.06 m <br />) +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (15 cm150 mm <br />0.15 m <br />) +
pink;dull;brown;pink;dull;brown;green +
persistent +, long +  and deciduous +
12mm;20mm +
ellipsoid-cylindric +
succulent +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
obscured +  and obliterated +
Arizona Upland Subdivision of Sonoran desert scrub, low gravelly hills, bajadas, and rocky hilltops, igneous substrates +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
0.7cm;1.8cm +
deciduous +  and persistent +
rudimentary +
flat +  and terete +
nearly +  and microscopic +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
tuberculate +
fluted;spheric;depressed-spheric or club-shaped +
red +  and green +
deciduous +  and persistent +
Flowering Mar–Apr +  and fruiting Apr–May. +
mucilaginous +
ridgelike +  and nipple--shaped +
Cact. Suc. Mex. +
1 +  and 20 +
triangular +
arillate +  and strophiolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hemispheric;spheric +
white +  and purplish-pink +
curved +  and straight +
deciduous +  and persistent +
11mm +  and 20mm +
12 (?) +  and 15 (?) +
annulate-ridged +, hairlike +, daggerlike +, subulate +  and acicular +
0.3 cm3 mm <br />0.003 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
hard +  and rigid +
0.042 cm0.42 mm <br />4.2e-4 m <br /> (0.059 cm0.59 mm <br />5.9e-4 m <br />) +
decurrent +
unsegmented +
4cm;16.5cm +
4 +  and 34.5 +
cylindric +, ovoid +  and spheric +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
succulent +
4cm;9cm +
red +  and brownish red +
tuberculate +
Neolloydia erectocentra var. acunensis +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Echinomastus erectocentrus var. acunensis +
Echinomastus erectocentrus +
variety +
undulate +  and entire +
dull +  and glossy +
epiphytic;epiphytic;epiphytic +
not deep-seated +
barrel-shaped +  and spheric +