Grusonia emoryi (Engelm.) Pinkava
Source: Pinkava, D.J. 1999. Cactaceae - Grusonia. Jour. of the AZ-NV Acad. of Sci. 32(1):50. 1999
Family: Cactaceae
Grusonia emoryi image
Ries Lindley  
Shrubs, forming mats, 15-30 cm. Roots diffuse. Stem segments curved-clavate, gradually to abruptly narrowed at base, 7-19 × 2.5-5 cm; tubercles very prominent, 20-50 mm, 1-3.5 times longer than wide, not or little obscured by spines; areoles 4-6 mm in diam.; wool white to gray. Spines 12-30 per areole, mostly in apical areoles to ± uniformly distributed along stems (in northern populations), spreading, yellow, tan, or red-brown, tipped yellow, longest 3-7 cm; major 3-5 abaxial spines divergent, yellowish or red-brown, angular-flattened, sharp-edged; major (1-)3-5 adaxial spines ascending-divergent, tan or red-brown, angular-flattened to subterete. Glochids adaxial in areole, yellow to brown, 5-7 mm. Flowers: inner tepals yellow, 20-30 mm; filaments yellow to reddish; style cream; stigma lobes cream or tinged pink. Fruits yellow, cylindric to ellipsoid, 40-90 × 14-40 mm, fleshy, spineless (rarely with few very short spines) but usually densely yellow glochidiate; areoles 30-45. Seeds yellowish white to yellow, 5-6 × 3.5-4 mm, smooth. 2n = 44. Flowering late spring (May-Jun). Chihuahuan and Sonoran deserts, sandy or gravelly desert flats, washes, hills; 700-1200 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua).
PLANT: Mat-formers, low, much-branched, 15-30 cm tall, from fibrous roots. STEM: segments curved-clavate, gradually to abruptly narrowed at base, 7-19 cm long, 2.5-5 cm in diam.; tubercles very conspicuous, 2-5 cm long. AREOLES: white- to gray-felty, subcircular, 4-6 mm in diam. SPINES: mostly in apical areoles to (in northern populations) well distributed along stems, yellow, tan to red brown, yellow-tipped, 12-30 per areole, spreading, the largest 3-7 cm long; major (1-)3-5 apical spines ascending-divergent, tan to red-brown, angular-flattened to subterete; major 3-5 basal spines divergent, yellowish to red-brown, angular-flattened, sharp-edged. GLOCHIDS: yellow to brown, apical in areole, 5-7 mm long. FLOWER: inner tepals yellow, 2-3 cm long; filaments yellow to reddish, the anthers yellow; style cream; stigmas cream or tinged pink. FRUIT: yellow, cylindric to ellipsoid, fleshy, spineless (rarely with a few very short spines) but usually densely yellow-glochidiate, 4-9 cm long, 1.4-4 cm in diam.; areoles 30-45. SEEDS: yellowish-white to yellow, smooth, 5-6 mm long, 3.5-4 mm wide. 2n = 44. NOTES: Chihuahuan and Sonoran deserts, sandy or gravelly desert flats, washes, and hills; Cochise, Gila, Graham, Greenlee, Pinal cos.; 750-1200 m (2400-3900 ft); May-Jun; NM, and disjunct and local in Presidio Co., TX; n Chih. in Mex. REFERENCES: Pinkava, Donald J. 1999. Cactaceae. Ariz. - Nev. Acad. Sci. 32(1).
Grusonia emoryi image
Ries Lindley  
Grusonia emoryi image
Ries Lindley  
Grusonia emoryi image
Patrick Alexander  
Grusonia emoryi image
Patrick Alexander  
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
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Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image
Grusonia emoryi image