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29b. Opuntia basilaris Engelmann & J. M. Bigelow var. treleasei (J. M. Coulter) J. M. Coulter ex Toumey in L. H. Bailey, Cycl. Amer. Hort. 3: 1147. 1901.
Kern beavertail pricklypear, Trelease’s beavertail pricklypear
Opuntia treleasei J. M. Coulter, Contr. U.S. Natl. Herb. 3: 434. 1896 (as treleasii)
Stem segments erect, flattened, obovate, 9-20 × 5-7.5 cm; areoles 7-8 per diagonal row across midstem segment, circular. Spines 2-8 per areole, usually in distal areoles, spreading, yellow, straight, acicular, terete, 5-25 mm. Fruits with few, pale yellow spines. 2n = 33.
Flowering spring (Mar-Apr). Grasslands; of con-servation concern; 100-200 m; Calif.
Opuntia basilaris var. treleasei is in the Center for Plant Conservation’s National Collection of Endangered Plants.
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