Ultimate joints slender, 1 to 2 cm. thick.
Vine-like, elongated; ultimate joints 1 cm. thick, 4 to 7-ribbed 1. L. weingartianus
Ultimate joints 2 cm. thick, 6 to 8 ribbed.
Tree-like, 5 meters high, the trunk 3 cm. in diameter at the base; flowers 3.5 cm. long, sparingly short-spiny 2. L. leonii
Prostrate, creeping; flowers 1.5 cm. long, densely long-spiny 3. L. prostratus
Ultimate joints stout, 2 to 6 cm. thick. Fruit densely long-spiny.
Bush-like, 1 to 3 meters high; ultimate joints 2 to 3 cm. thick; fruit 3 to 6 cm. long.
Joints 4-ribbed; spines brown 4. L. assurgens
Joints 5 to 7-ribbed; spines yellow 5. L. maxonii
Tree-like, 5 to 6 meters high; ultimate joints 5 to 6 cm. thick; fruit 8 to 10 cm. long . . .6. L. arboreus Fruit sparingly short-spiny; tree-like species.
Joints 5 to 7-ribbed, the ribs very broad; fruit 7 to 8 cm. long 7. L. sylvestris joints 3 to 4-ribbed, the ribs low; fruit 3 to 5 cm. long 8. L. quadricostatus
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