This genus comprises over 28 species, mostly bearing superb. The are nocturnal, large, funnel-shaped, mostly white, and highly perfumed.
Trichocereus schickendantzii. Argentina. Thrives well in cultivation and is frequently seen in collections. It grows well fromand forms erect columns of a shining dark green, with about 16 ribs. The areoles are yellowish-white, passing to brown; the spines yellowish. The pointed flower buds are covered with black wool and rise from the crowns 5< of the small columns, opening into large, very beautiful white funnel-shaped flowers, with a delicious perfume.
Trichocereus candicans. NW. Argentina. A robust species of easy cultivation, forming characteristicof branches from the base. It is shining green on top, dark green lower down, with 9 to 11 low ridges. The large areoles filled with white wool bear 10 to 14 radial spines, and thicker central spines.
Trichocereus macrogonus. Argentina and Bolivia. Theare columnar, with 6 to 9 prominent rounded ribs with narrow furrows between them. The radial spines number 6 to 9, the thicker central spines 1 to 3; the flowers are large, greenish-white outside and white inside. This species is often used for grafting stock for Echinocacti, etc.
Trichocereus spachianus. A fine species, fast growing. The, freely branching from the base, are glossy light green, with 10 to 15 rounded ribs; the spines are yellow at first, passing to brown; radials 8, centrals 1 or 2. The flowers are produced near the top of the , the outside petals being greenish, the inner petals white. A night-flowering species.