Mammillaria declivis
Mammillaria declivis
Mammillaria declivis
Mammillaria declivis A.Dietr. is treated as an accepted taxon in Plants of the World Online.1
The current source-backed classification places it in Cactaceae within Mammillaria.12
POWO records the plant context as Unknown, Unknown.1
This is a source-populated draft intended for later Kaktus Doktoru editorial rewriting; care advice and morphology should be reviewed before publication.
References
- Plants of the World Online. "Mammillaria declivis A.Dietr.". Royal Botanic Gardens, Kew. Accessed: 2026-06-10. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:134481-1 ↩
- GBIF Secretariat. "Mammillaria declivis". GBIF Backbone Taxonomy. Accessed: 2026-06-10. https://www.gbif.org/species/5621404 ↩
Plants In This Group
Mammillaria declivis
Mammillaria declivis
Mammillaria declivis is a compact, drought-tolerant cactus species belonging to the diverse genus Mammillaria within the Cactaceae family. It is highly adapted to harsh, arid coastal conditions in its native environment.
Taxonomy and Naming
It was first described by botanist Robert T. Craig in 1945 1. Taxonomically, it is closely related to the Mammillaria dioica complex, and is sometimes classified as a synonym or subspecies within that group 2. The specific epithet 'declivis' translates to 'sloping' or 'declivitous' in Latin, referencing its natural preference for growing on steep hillsides.
Distribution and Habitat
This species is native to Baja California, Mexico, and its adjacent islands (such as Natividad Island). It thrives on steep coastal cliffs, rocky limestone slopes, and windswept marine terraces at low elevations.
Appearance
The stems are cylindrical, reaching 10-15 cm in height and 4-6 cm in diameter. The surface is covered with prominent tubercles. Each areole features 1 to 4 central spines, often hooked and brownish, surrounded by numerous fine, white radial spines. In late spring, it produces small, cream to pale-yellow funnel-shaped flowers, followed by bright red, edible cylindrical fruits.
Cultivation and Care
It performs best in mineral-rich, highly porous soil mixes. It requires full sun and excellent air circulation to prevent fungal pathogens. Water thoroughly only when the substrate has completely dried out, and keep virtually dry during winter dormancy.
Common Care Mistakes
Overwatering is the primary cause of failure, quickly leading to root rot 1. Insufficient light exposure causes etiolation, stretching and weakening the stem.