Echinomastus acunensis
Saguaroland Bull. 7: 34 1953.
Family
Cactaceae
Genus
Species
Echinomastus acunensis
Author
W.T.Marshall
Chinese genus
美刺球属
Chinese name
-
Accepted
DescriptionEdit description
Central Spines
Dark-tipped, reddish, pink, ascending, (1-)2-3(-4) per areole, 19-44 mm long, uppermost ones longer often curved toward apex of plant, sometimes slightly so. The longest or only central spine 25-35 mm long.
Phenology
Flowering Mar-Apr; fruiting Apr-May.
Tubercles
Grooved in the upper side.
Flowers
3.5-5(-6) cm long, 4-5 cm in diameter. Outer perianth segments (sepaloids) with purplish-green midribs, to 7.5 mm broad and up to 30 mm long. Inner perianth segments (20-)30-43 mm long, 07-18 mm wide, pale to bright rose-pink, blotched at the base with orangish brown, chestnut, maroon, or greenish brown. Stigma lobes mostly 10, 1.5 mm long, stout red to brownish red, papillae red to green. Ovary in anthesis broadly obconical.
Chromosome Number
2n = 22.
Spines
Dense, obscuring surface of stem 13-16 per areole, purplish pink or nearly white with brown tips.
Ribs
15-21. the indentations between tubercles sharp and narrow.
Stem
Ovoid or somewhat cylindricoid, (4-)10-22(-27) cm tall, 4-9(-10) cm in diameter.
Radial Spines
11-15 appressed. The lowermost the shortest 11-20 mm long; uppermost and lateral ones longest 22-25(-37) mm long, the lateral spines often pectinate.
Areoles
15-19 mm apart along ribs.