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Visionary Cactus Guide


The name of this genus is derived from the Greek word "yle" for forest.

H. trigonus -

Reported to contain unspecified alkaloids.

H. undatus ( Haworth ) -

The origin of this species is unknown, but it is semi-naturalised or cultivated in all tropical countries. Also known as Cereus triangularis. Plants known for their 3 slender, prominent ribs with corrugated edges. The 7 cm thick stems are long and climbing, thickly ramified. Areoles are far apart, each with 1 to 3 short spines. White nocturnal flowers and edible red fruit.

Roots need support to cling to, and a lot of growing room. Requires a mild climate without severe cold spells. Can also be used as a grafting stock for more hard to grow species.

Reported to contain unspecified alkaloids.