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Trichocereus riomizquensis (Ritter)
Trichocereus riomizquensis is a Bolivian Trichocereus closely related to Trichocereus bridgesii. It is a regional form of T. bridgesii that only endemic to one site in Bolivia near the Rio Mizque.
The species was discovered and described by the German cactus field botanist Friedrich Ritter, who gave Chuyllas as the type locality and mentioned it would grow on steep slopes in the province Campero.
His Field Number was FR 856. Friedrich Ritter ran a seed shop and sold this species as seed to people all over the world. Trichocereus riomizquensis was also visited during the Sacred Succulents Fieldtrips and they found a couple of different types growing around that area.
In Ritter´s book, he published a photo of this species. Unfortunately this photo is not very good and it is one of the species that are rare in cultivation. Almost all labels on plants grown from Ritter´s seeds are lost, but the plant is definitely available. On the market, it sometimes shows up labeled PC Predominant cultivar.
Ben Kamm published some photos of a herbarium specimen that shows the close relationship to Trichocereus bridgesii.
Where to buy seeds and plants of Trichocereus riomizquensis?:
Though Trichocereus riomizquensis is common in cactus collection in the USA, it is usually mislabeled. Sacred Succulents were giving away seeds after their Field Trips and some plants might have gotten into the hands of collectors. Unfortunately, I haven’t seen any plants raised from their seeds yet.
Description: This is partial description of Friedrich Ritter´s original description, including remarks on how to keep it apart from T. scopulicola.
Trichocereus riomizquensis is 6-8 centimeters thick (while Trichocereus scopulicola is 8-10 centimeters thick), it has 5-6 ribs, (T. scopulicola: 4-6), flanks 2 centimeters wide (Scopulicola 3-4), less rounded flanks than the ones on Tr. scopulicola. It has rounded areoles (while the ones on T. scopulicola are usually oval). The areoles have a very visible fluff with a diameter of 2-3 mm. The 1-5 spines are honey-colored and between 1-3 mm long. Sometimes they are even missing.
The flowers of Trichocereus riomizquensis is 20 centimeters long (while the flowers of T. scopulicola are 16-20) and covered with dark brown wool with large scales. The fruit looks bumpy.
Type locality: Chuyllas near the Rio Mizque, on very steep rock walls in the province Campero, Bolivia. Discovered from Ritter in 1958 – FR 856.
This is one of the plants from the Sacred Succulents Field Trips:
Copyright Ben Kamm, Sacredsucculents.com
Trichocereus Riomizquensis BK 10.08.7