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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.
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:
- Denmoza rhodacantha (Salm-Dyck) Britton & Rose
- Cereus rhodacanthus (Salm-Dyck) F.A.C.Weber in Bois
- Cleistocactus rhodacanthus (Salm-Dyck) Lem.
- Echinocactus rhodacanthus Salm-Dyck
- Echinopsis rhodacantha (Salm-Dyck) Förster
- Pilocereus rhodacanthus (Salm-Dyck) Speg.
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
- Denmoza rhodacantha (Salm-Dyck) Britton & Rose
- Cereus rhodacanthus (Salm-Dyck) F.A.C.Weber in Bois
- Cleistocactus rhodacanthus (Salm-Dyck) Lem.
- Echinocactus rhodacanthus Salm-Dyck
- Echinopsis rhodacantha (Salm-Dyck) Förster
- Pilocereus rhodacanthus (Salm-Dyck) Speg.
- Denmoza erythrocephala (K.Schum.) A.Berger
- Cereus erythrocephalus (K.Schum.) A.Berger
- Echinocactus erythrocephalus (K.Schum.) H.P.Kelsey & Dayton
- Pilocereus erythrocephalus K.Schum.
- Denmoza rhodacantha var. diamantina Slaba
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A large colony in habitat (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González

Yellow and red spines forms in habitat (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: 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

It has extraordinary scarlet zygomorphic, tubular flowers. (Denmoza rhodacantha) Photo by: Valentino Vallicelli

Red spines form (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González

Cereus rhodacanthus (Denmoza rhodacantha) Photo by: Valentino Vallicelli

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

Spines (Mendoza province, Argentina) (Denmoza rhodacantha) Photo by: Carolina González
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