The cactus spines are not connected with the axis of the stem or branches. The spines emerge from the areoles.

Cactus Spines

The cactus spines are not connected with the axis of the stem or branches. The spines emerge from the…

Illustrated are the sheathed spines of opuntia leptocaulis.

Opuntia Leptocaulis

Illustrated are the sheathed spines of opuntia leptocaulis.