Key to Species

Spines short, mm. to 8 cm. long. Joints scarcely if at all tuberculate.

Joints obovate to elliptic, mostly not more than twice as long as wide.

Areoles close together, sunken 201. O. spinulifera

Areoles not close together, not sunken. Joints dull.

Spines acicular 202. O. lasiacantha

Spines subulate.

Areoles with 2 or more short reflexed hairs or bristles at the lower part of the areoles.

Spines strongly depressed; areoles with several hairs 203. O. hyptiacantha

Spines not strongly depressed; areoles with 1 or 2 hairs.

Joints obovate 204. O. streptacantha

Joints oblong 205. O. amyclaea

Areoles without reflexed hairs or bristles.

Spines clear white, terete or nearly so; fruit spineless, 6 to 8 cm. long, yellow, edible 206. O. megacantha

Spines white to dull yellow, somewhat flattened; fruit 6 cm. long or less bearing a few spines near the top, red, not edible. Plant with a definite trunk; petals reddish; fruit spiny only at top . . . 207. O. deamii

Plant bushy; petals chocolate-colored; fruit spiny all over 2o7a. O. dobbieana

Joints shining 208. O. eichlamii

Joints oblong to oblanceolate, some of them much longer than wide.

Joints shining; wool of young areoles white; petals yellow 209. O. inaequilateralis

Joints dull; wool of young areoles brown; petals deep orange to scarlet 210. O. pittieri

Joints strongly tuberculate 211. O. cordobensis

Spines elongated, 10 to 14 cm. long 212. O. quimilo

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