Trichocereus santiaguensis

• Body: Tree-like with matte yellowish to pale green cylindrical trunk to 23' (7m.) high, branches ascending, to 4” diameter.
• Ribs:
• Areoles/Spines: Areoles white at first, to .6” (1.5cm.) apart. Spines slightly recurved, lowest ones to .4” (1cm.) long, upper ones to .2” (5mm.) long. One center spine to .75” (2cm.).
• Flowers/Fruit: Unscented, white flower to 8” (20cm.) long.
• Distribution: In woodlands near Icaño, Argentina.

Trichocereus schickendantzii

• Body: Intense/dark green, branching freely from the base to form large colonies to 10” (25cm.) high. Branches curve upwards, to 2.4” (6cm.) diameter. Differentiated from T. manguinii by it's lower habit and lighter skin.
• Ribs: 14-18, only .2” (5mm.) high with slight depressions between the areoles.
• Areoles/Spines: Spines to .4” (1cm.), yellowish, flexible. Nine radial spines at first, more later. Two to 8 central spines.
• Flowers/Fruit: White, funnelform, unscented flowers to 8.75” (22cm.) long with several blooming from the top of the plant. Edible fruit.
• Distribution: Northwestern Argentina.

Trichocereus schoenii

• Body: Grayish-green, branching irregularly from the base, to 13' (4m.). Branches to 6” (15cm.) diameter.
• Ribs: 7
• Areoles/Spines: Yellowish-gray areoles, .4” (1cm.) diameter, .75” (cm.) apart, surmounted by a “V”-notch. Spines leather-brown at first, later gray with leather-brown tips. Six to 8 dissimilar radial spines, upper ones to .6” (1.5cm.), lower ones to 2” (5cm.). One to 2 stout, porrect or downward directed central spines to 2.75” (7cm.) long.
• Flowers/Fruit: White flower to 6.25” (16cm.) long.
• Distribution: Up to 12,800' (3900m.) in the valley of the Rio Majes, Chuquibamba, southern Peru.

Trichocereus scopulicolus

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