By Del Weniger
Cacti of the Southwest: Texas, New Mexico, Oklahoma, Louisiana and Arkansas.
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Additional info for Cacti of the Southwest: Texas, New Mexico, Oklahoma, Louisiana and Arkansas
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.
28 Mammillaria sulcata. 41/8 inches in diameter. Mammillaria ramillosa. 31/4 inches in diameter. 29 Mammillaria macromeris. Young plant, not yet clustered. 3 inches tall. (below, left) Mammillaria runyonii. 4 inches in diameter. (below, right) Mammillaria similis. Typical small plant; diameter 3 inches. 30 Mammillaria similis. Old plant in full bloom. Diameter 12 inches. Mammillaria vivipara var. vivipara. 21/4 inches in diameter. 31 32 Mammillaria vivipara var. arizonica. 3 inches in diameter.
Largest stem 3 inches in diameter. (below) Lophophora williamsii var. echinata. Largest stem 21/2 inches in diameter. Plate 27 (opposite) (above, left) Pediocactus simpsonii var. simpsonii. 3 inches in diameter. (above, right) Pediocactus knowltonii. 1 inch in diameter. (below, left) Pediocactus papyracanthus. 2 inches tall. (below, right) Epithelantha micromeris. 11/2 inches in diameter. 26 27 Mammillaria scheeri. 6 inches in diameter. Mammillaria scolymoides. 31/4 inches in diameter. Mammillaria echinus.