Trichocereus spachianoides

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

Trichocereus spachianus

• Body: Stem upright, at first simple, columnar, later profusely branching from below (to 2.4” (6cm.) diameter) ascending parallel with the main stem, to 6.5' (2m.) high.
• Ribs: 10-15, rounded, fairly low.
• Areoles/Spines: Large areoles, yellowish at first, later white, about .4” (1cm.) apart. Spines amber-yellow to brownish, becoming gray; 8-10 radial spines, needle-like, stiff, sharp, to .4” (1cm.); single, stouter central spine, longer than the radials (may have up to 3).
• Flowers/Fruit: White flower, to 8” (20cm.) long, 6” (15cm.) diameter.
• Distribution: Western Argentina.

Trichocereus strigosus

• Body: Forms large colonies up to 6.5' (2m.) broad, branches usually simple, erect or ascending to 24” (60cm.) high, 2.4” (6cm.) diameter.
• Ribs: 15-18, very low (to .2” (5mm.) high), obtuse.
• Areoles/Spines: Areoles circular, rather large, .3” (8mm.) apart with dense white wool when young. Spines barely differentiated into radial and central spines, needle-like, variable in color from white through yellow to pink, reddish-brown or black, numerous, to 2” (5cm.) long.
• Flowers/Fruit: Flower, white to delicate pink, funnelform, to 8” (20cm.) long. Backeberg feels the ones with a lilac-pink flower should be described as v. roseoalbus.
• Distribution: Western Argentina.

Trichocereus tacaquirensis

• Body: Mostly branching from the base to 8.2' (2.5m.) tall. Branches fairly crowded, steeply ascending.
• Ribs: Variable in number, .75” (2cm.) high.
• Areoles/Spines: Areoles large, round, white-felty. Spines more or less bristle-like, especially at first, more or less interlacing, flexible, barely differentiated between radial and central spines, those in the crown erect, to 3.1” (8cm.) long.
• Flowers/Fruit: White flower, to 8” (20cm.) long.
• Distribution: Tacaquira, Bolivia.