Key to Species

Joints ovate to broadly oblong or obovate.

Joints thin, lustrous, light green

Joints turgid, dull green.

Leaves purplish, rigid; joints dark green

Leaves green, not rigid; joints pale green.

Spines slender, terete

Spines stout, angled, elongated

Joints narrowly oblong to linear or spatulate.

Joints oblong to linear; flowers brick-red

Joints spatulate; flowers orange

64. O. vulgaris

65. O. elata

66. O. cardiosperma

67. O. arechavaletai

68. O. mieckleyi

69. O. bonaerensis

Continue reading here: Opuntia vulgaris Miller Gard Dict ed 8 No 1 1768

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