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Trichocereus (Berg.) Ricc : A group of columnar plants from South America which vary from very large tree-like plants to low clumping and sprawling forms. The taxonomists now include these all in Echinopsis and it is indeed hard to define a boundary. It is nevertheless very inconvenient horticulturally to have large tree-like plants included with smaller plants suitable for growing in small pots in greenhouses. The position is further complicated by the inclusion of day flowering plants sometimes named as Helianthocereus which are not completely divided from Lobivia and some of the Chilean species which merge over to Eulychnia.
 T.arboricola JCS 11311 Bolivia 1100m. Chillaguatas Prov. Arce dept. Tarija HBG51694 Hanging basket cactus |
 "T.argentinensis" from old Merritt Dunlaps collection. Resembles a very thick T.peruvianus to 8 or 10 inches. Nothig else known about this plant, name implies from Argentina |
 T.brevispinulosus | |
|---|---|---|---|
 T.brevispinulosus = T.harrissima, nothing else known about this plant, tuberculate stems. |
 T.bridgesii (SD) BR&R FR101 La Paz, Bolivia |
 T.cephalomacrostibas (Werd.& Backbg.) from Merritt Dunlaps collection S.Peru above Mollendo |  T.chalaensis (Rauh & Backbg) FR1052 Chala Peru. Grayish-blue stems, may be same plant as T.lucernatus. |
 T.chilensis El Molles, intermediate to T.chilensis and T.littoralis, probably a natural hybrid between the two cacti. |
 T.chilensis from Chile. Berkeley Botanic Gardens |
 T.chilensis, thick form with light spines |
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