Origin and Habitat: It is an islands endemic from Gulf of California, Mexico. (Baja California, Carmen island)

• Ferocactus diguetii subs. carmenensis (G.E.Linds.) F.Wolf & R.Wolf
• Ferocactus diguetii var. carmenensis G.E.Linds.

• Ferocactus diguetii (F.A.C.Weber) Britton & Rose
• Echinocactus diguetii F.A.C.Weber
• Ferocactus diguetii f. variegatus (Hybrid) hort.

• Ferocactus diguetii subs. carmenensis (G.E.Linds.) F.Wolf & R.Wolf
• Ferocactus diguetii var. carmenensis G.E.Linds.

Description: Contrarily to the common Ferocactus diguetiiSN|16050]]SN|16050]] that form a huge, solitary column up to 4 m tall the variety carmenesis only reaches 1 metre of eight. Apart for the reduced size and slowest rate of growth this plant looks almost identical to the standard form.
Derivation of specific name: This member of the Cactaceae family was given this name for the occurrence on Isla del Carmen, Gulf of California, Mexico.
Stem: Shortly cylindrical that never grows up to to 40 cm in diameter and 100 cm in height, but usually much smaller. The young specimens are often globular rather than flattened.
Ribs: Slightly tuberculate and wavy. Mature plants have 25 to 35 ribs; 4 to 8 spines, almost all alike, not ringed or hooked, up to 7cm long.
Spines: The spines in the juvenile plants are somewhat heavier than in the standard Ferocactus diguetiiSN|16050]]SN|16050]], they vary from 4 to 8 (often up to 10 in juvenile specimens), clear yellow or sometime reddish or brownish, almost all alike, subulated, not ringed or hooked, slightly curved outward, up to 7 cm long (but usually shorter).
Flowers: The fiery reddish to orange flowers are about 4 cm long and bloom from March to May.
Blooming season: Flowers from March to May.
Fruits: Up to 3 cm long.
Seeds: Glossy brown, irregular, 1,5 mm wide.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) James Cullen, Sabina G. Knees, H. Suzanne Cubey "The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass" Cambridge University Press, 11/Aug/2011
3) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
4) N. L. Britton, J. N. Rose “The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family.” Volume 4, The Carnegie Institution of Washington, Washington 1923
5) Ted J. Case, Martin L. Cody, Exequiel Ezcurra “A New Island Biogeography of the Sea of Cortes” Oxford University Press, 21 November 2002
6) Stewart W. Aitchison “The Desert Islands of Mexico's Sea of Cortez” University of Arizona Press, 2010
7) Urs Eggli, Leonard E. Newton “Etymological Dictionary of Succulent Plant Names” Springer Science & Business Media, 29 June 2013
8) León de la Luz, J.L., Gómez-Hinostrosa, C. & Hernández, H.M. 2013. Ferocactus diguetii. The IUCN Red List of Threatened Species 2013: e.T151761A558650. http://dx.doi.org/10.2305/IUCN.UK.2013-1.RLTS.T151761A558650.en. Downloaded on 31 October 2016.

Cultivation and Propagation: Plants are very slow growing to start but are easy to grow and require little care once they have reached a nice flowering size. It is suited for any rich, well drained soil in full sun troughout the year.
Pot culture: grow best in a fairly roomy, well-drained container filled with a porous cactus soil mixture that doesn't contain too much humus. To insure robust plants water and fertilize during the aestival growth cycle, this plant need plenty of water (indicatively to about once a week) But needs to be avoided wetting the bodies of these plants while they are in sunlight. A wet cactus in the sun light can cause sun burning which can lead to scars or even fungal infections and death. In winter keep completely dry at 10°C this usually aids in maintaining a healthier plant, but can tolerate sporadic light frost.
Propagation: Seeds are the only way of reproducing.