Trichocereus

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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 T.arboricola
T.arboricola JCS 11311 Bolivia 1100m. Chillaguatas Prov. Arce dept. Tarija
HBG51694 Hanging basket cactus
T.argentin
"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.brevispinulosus T.brevispinulosus
T.brevispinulosus = T.harrissima, nothing else known
about this plant, tuberculate stems.
T.bridgesii
T.bridgesii (SD) BR&R FR101
La Paz, Bolivia
T.cephalomacrostibas
T.cephalomacrostibas (Werd.& Backbg.)
from Merritt Dunlaps collection
S.Peru above Mollendo
T.chalaensis
T.chalaensis (Rauh & Backbg)
FR1052 Chala Peru.
Grayish-blue stems, may be
same plant as T.lucernatus.
T.chilensis
T.chilensis El Molles, intermediate
to T.chilensis and T.littoralis,
probably a natural hybrid
between the two cacti.
T.chilensis
T.chilensis from Chile.
Berkeley Botanic Gardens
T.chilensis
T.chilensis, thick form
with light spines

Copyright Bob Ressler, no reproduction without permission of the author.