Key to Species

Seeds narrowly winged; spines up to 2 cm. long 1. P. hickenii

Seeds broadly winged; spines 3 to 10 mm. long.

Joints strongly tuberculate 2. P. fischeri

Joints scarcely tuberculate.

Ovary densely covered with weak spines; wing of seed 1 mm. wide 3. P. pumilus

Ovary loosely covered with stiff spines; wing of seed 2 mm. wide 4. P tuberosus

Figs. 31, 32.—Pterocactus hickenii X0.7.

Fig. 33.—Pterocactus fischeri. X1.12. Photograph by Paul G. Russell

Figs. 31, 32.—Pterocactus hickenii X0.7.

Fig. 33.—Pterocactus fischeri. X1.12. Photograph by Paul G. Russell

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