| Opuntia grahamii Engelm. A low, spreading plant 4-8 in. high, with thick, fusiform roots: joints 2-3 in. long and ½ in- thick, armed with long, dark spines, bright green: areoles with white wool and numerous long, yellowish brown, rigid bristles which become very conspicuous on old joints; exterior spines 4-8, ⅓ in long, interior 4-7,more rigid and longer (1½-2 in.), reddish to ashy brown: fls. yellow, 1½-2 in. wide: fr. ellipsoidal, 1½-1¾ in. long and half as wide, armed with many large, radiating spine-like bristles. New Mex., Texas. | | Opuntia grahamii Engelm. A low, spreading plant 4-8 in. high, with thick, fusiform roots: joints 2-3 in. long and ½ in- thick, armed with long, dark spines, bright green: areoles with white wool and numerous long, yellowish brown, rigid bristles which become very conspicuous on old joints; exterior spines 4-8, ⅓ in long, interior 4-7,more rigid and longer (1½-2 in.), reddish to ashy brown: fls. yellow, 1½-2 in. wide: fr. ellipsoidal, 1½-1¾ in. long and half as wide, armed with many large, radiating spine-like bristles. New Mex., Texas. |