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Trichocereus tarmaensis Rauh & Backeberg – Deser. Cact. Nov. 20. 1956
Trichocereus tarmaensis is not an accepted species. It was described, but the whole species wasn´t really good to begin with due to the close relationship to Trichocereus cuzcoensis and other species like Tr. knuthianus.
You can buy seeds of Trichocereus tarmaensis here:
It probably is a variety of Trichocereus peruvianus (or Tr. cuzcoensis if you use that term) and grows around Tarma in Peru. The plant is close to Trichocereus cuzcoensis and would probably be seen as a variety of that species. These days, most of those San Pedro style Trichocereus species were included in the species Trichocereus peruvianus.
Trichocereus tarmaensis is said to reach a size of 2 meters and is pupping from the base. It has between 7-9 ribs that are approximately 2 centimeters wide, rounded at the top and with very distinct V-notches above the areoles. The areoles are approx. 2-2,5 centimeters apart with a diameter of 9 millimeters. Young growth areoles have a very fine brown wool that changes it´s color to a darker brown. It has 3-6 radial spines that are between 1 and 3 cm long. It often has one very large downward pointing spine that is up to 10 centimeters long. The plant usually has one of those middle spines. Old spine growth changes its color very soon to a gray, similar to what we know from Trichocereus cuzcoensis.
Flower: White, very similar or identical to Trichocereus peruvianus. The tube has brown hairs and the fruit reaches a maximum diameter of 5 centimeters.
Typus location: Tarma in Peru at around 3000 meters.
Trichocereus tarmaensis looks VERY similar to Trichocereus tulhyacensis and both “species” can be confused very easily with each other. The flower of Trichocereus tulhuyacensis is not white though. If your Trichocereus has a reddish to pink flower, it´s not Trichocereus tarmaensis but Trichocereus tulhuyacensis. But both types are very rare and are usually mislabeled as Trichocereus peruvianus or simply “San Pedr”o. Karel Knize is selling seed of this type under the name KK2148 Trichocereus tarmaensis .
This picture shows a seedgrown specimen that was sold through the SAB shop in australia.
When looking at this pic, it gets obvious that this type is VERY similar to some types of Trichocereus cuzcoensis, and even has similarities to a KK242. I do not think that specimens of KK2148 Trichocereus tarmaensis could be recognized as such without knowing the label. They are simply synonymous with some types of Trichocereus cuzcoensis. Those Trichocereus tarmaensis grow at around 3000 meters altitude.
Photo: S. Preiss
If you want to purchase a specimen, you might try your luck at the SAB shop, though they are currently out of stock.