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

Continue reading here: Pterocactus hickenii sp nov

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