Trichocereus tenuispinus

• Body: No description.
• Ribs:
• Areoles/Spines:
• Flowers/Fruit:
• Distribution:
• Subspecies: v. pajanalensis: No description.

Trichocereus terscheckii

• Body: At first columnar with an intense green, woody trunk up to 17.75” (45cm.) diameter, to 40' (12m.) tall. When older becomes branched with parallel, ascending branches to 8” (20cm.) diameter. Often confused with T. pasacana but is more branched, fewer ribs, different spines and larger flowers.
• Ribs: 8-14, prominent, obtuse, to 1.6” (4cm.) high.
• Areoles/Spines: Areoles felted, to .6” (1.5cm.) diameter, to 1.2” (3cm.) apart. Spines yellow, 8-15, tapering to a fine point, to 3.1” (8cm.) long.
• Flowers/Fruit: Large flowers to 8” (20cm.) long, 4.75” (12cm.) broad.
• Distribution: Northern Argentina.
• Subspecies: v. montanus: Branches lighter green, obliquely ascending.

Trichocereus terscheckioides

• Body: No description.
• Ribs:
• Areoles/Spines:
• Flowers/Fruit:
• Distribution:

Trichocereus thelegonoides

• Body: Thick, cylindrical trunk to 20' (6m.) high, 7” (18cm.) diameter. More or less branched from above, branches more or less curved, ascending, obtuse at apex, to 3.1” (8cm.) diameter.
• Ribs: 15, low, rounded, strongly tuberculate at first because of the transverse depressions between the areoles but gradually disappearing with age.
• Areoles/Spines: Areoles, small, circular, felted. Eight to 10 yellow or brownish, bristly spines, to .3” (8mm.) long.
• Flowers/Fruit: Flower white, greenish outside to 9.5 (24cm.) long.
• Distribution: On dry hills, Jujuy, Northern Argentina.