By Weniger D.
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Extra resources for Cacti of the Southwest
21/4 inches in diameter. 31 32 Mammillaria vivipara var. arizonica. 3 inches in diameter. Mammillaria fragrans 21/4 inches in diameter. Plate 32 (opposite) (above, left) Mammillaria vivipara var. radiosa. 2 inches in diameter. (above, right) Mammillaria vivipara var. neo-mexicana. Large stem 21/4 inches in diameter. (below, left) Mammillaria vivipara var. borealis. 2 inches in diameter. (below, right) Mammillaria vivipara var. neo-mexicana. Young plants, showing juvenile spination on sides of stem and mature spines at the tips.
Fendleri. Stem 53/4 inches tall. Echinocereus dubius. Tallest stem 9 inches high. Two specimens of Lophophora williamsii in right foregrounds. 15 Echinocereus papillosus var. angusticeps. Tallest stem pictured, 3 inches high. (above, right) Echinocereus papillosus var. papillosus. Sprawling stems, 2 inches high. Echinocereus pentalophus. Stems approximately 3/4 inch in diameter. 16 Wilcoxia poselgeri. Single upright stem, 12 inches long. Echinocereus papillosus var. papillosus on ground. (above, left) Echinocereus blanckii.
Stem pictured, 101/2 inches long. Echinocereus berlandieri. Tallest stems pictured, 4 inches high. 17 Peniocereus greggii. Flowers 27/8 inches in diameter. (below, left) Acanthocereus pentagonus. Flower 61/2 inches long, including ovary and tube. (below right) Echinocactus horizonthalonius var. curvispina. 6 inches in diameter. 18 Echinocactus texensis. 6 inches in diameter. (above, left) Echinocactus horizonthalonius var. moelleri. 7 inches in diameter. Echinocactus asterias. 21/2 inches in diameter.