Key to Species

Joints obovate to elliptic, comparatively broad, more or less glaucous. Joints dull.

Joints thin, up to 5 dm. long . . . 196. O. ficus-indica Joints thick, 15 cm. long or less . 197. O. crassa

Joints glossy 198. O. undulata

Joints elongated, comparatively narrow.

Flowers yellow; joints somewhat tuberculate 199. O. lanceolata

Flowers orange-red; joints not tu-

berculate 200. O. maxima

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