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Cereus rhodacanthus (Salm-Dyck) F.A.C.Weber in Bois
Dict. Hort. [Bois] 1: 472. 1896
Family: CACTACEAE

Accepted Scientific Name: Denmoza rhodacantha (Salm-Dyck) Britton & Rose
Cactaceae (Britton & Rose) 3: 79. 1922 [12 Oct 1922] Britton & Rose

Cereus rhodacanthus (Denmoza rhodacantha) Photo by: Valentino Vallicelli
It's specific name comes from old Greek and means ''red spine'' for the colour of its clusters of spines. However the spines shape and colour of this species is variable. D. rhodacantha also changes considerably in the habit with age and the old specimen after many years start producing long white bristle. This white bristled form was previously known with the name of Denmoza erythrocephala. Denmoza ''rhodacantha'' and ''erythrocephala'' looks very different but are the same species. It's a barrel type of cactus and stay globular during a long period before becoming shortly column-shaped.

Synonyms:

See all synonyms of Denmoza rhodacantha
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Accepted name in llifle Database:
Denmoza rhodacantha (Salm-Dyck) Britton & Rose
Cactaceae (Britton & Rose) 3: 79. 1922 [12 Oct 1922]
Synonymy: 11 Cultivars (2):
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Subspecies, varieties, forms and cultivars of plants belonging to the Denmoza rhodacantha group

  • Denmoza erythrocephala (K.Schum.) A.Berger: (Denmoza rhodacantha) The name ''erythrocephala'' refers to old mature plants having multiple number of spines and sometimes with thin, 6 cm long bristly spines. The young plants with fewer but strong spines are known as "rhodacantha".
  • Denmoza rhodacantha (Salm-Dyck) Britton & Rose: The name '"D. rhodacantha" refers to young plants having few strong spines. Old plants of the same species with multiple number of spines and sometimes with thin greysh-white, bristly spines up to 6 cm long correspond to the description of "D. erythrocephala".
  • Denmoza rhodacantha var. diamantina Slaba: It is a fiercely spiny cactus with impressive and showy ivory or yellowish spines. The spines shape and colour of this species changes considerably with age and the old specimen after many years start producing long white bristle.
  • Denmoza rhodacantha cv. Orange Spines: The spines on young plants are orange to rich-amber coloured.
  • Denmoza rhodacantha cv. Yellow Spines: The spines on young plants are yellowish to amber in colour, aging to grey with time.


23636 carolina Carolina González
A large colony in habitat (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González
23637 carolina Carolina González
Yellow and red spines forms in habitat (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González

23639 carolina Carolina González
Buds. First flowers appear some time on relatively young plants but also on 30-40 years old specimens! (Denmoza rhodacantha) Photo by: Carolina González
1485 valentino Valentino Vallicelli
It has extraordinary scarlet zygomorphic, tubular flowers. (Denmoza rhodacantha) Photo by: Valentino Vallicelli

23634 carolina Carolina González
Red spines form (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González
5281 valentino Valentino Vallicelli
Cereus rhodacanthus (Denmoza rhodacantha) Photo by: Valentino Vallicelli

23635 carolina Carolina González
A tall columnar specimen (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González
23638 carolina Carolina González
Spines (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González

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by Carolina González

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by Valentino Vallicelli

by Valentino Vallicelli
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