Ferocactus

A cactus with a massive, ribbed stem and dense spines, known in much of the literature as Ferocactus cylindraceus. The name and subspecies classification adopted here follow POWO. Studies of pollination and water relations concern specific populations of this variable species.

(Britton & Rose) Britton & Rose

(Orcutt) Britton & Rose

(F.A.C.Weber) Britton & Rose

(DC.) Britton & Rose

(Engelm.) Orcutt

(Scheidw.) Britton & Rose

(Orcutt) Britton & Rose

(DC.) Britton & Rose

H.E.Gates

(Monv. ex Salm-Dyck) Bravo ex Backeb. & F.M.Knuth

(Muehlenpf.) Britton & Rose

A ferocactus of northwestern Mexico, also growing on coastal plains with seasonal excesses of water and salt. Its seeds can germinate inside fruits before leaving the mother plant. A field study described differing frequencies of this phenomenon in three groups with different soil moisture and salinity.

(DC.) G.E.Linds.

Britton & Rose

A low-growing Mexican ferocactus with distinct ribs and a flattened, hooked central spine. Seeds from the population studied in San Luis Potosí carried different bacterial communities on their surfaces and inside them, adding the plant's earliest life stage to its description.

Bravo

(Mart.) Britton & Rose

A ribbed ferocactus of the Baja California peninsula with strong spines, among which the lower central spine can be strongly hooked. The species has been studied for stem regeneration from very thin seedling fragments.

A ferocactus with strong spines and fine white bristles, changing from a spherical juvenile form to a large barrel-shaped stem. Its seeds take part in two well-studied processes, responding to previous wetting episodes and forming their own microbial community.

(Salm-Dyck) Backeb.

(Otto ex Pfeiff.) Britton & Rose

Britton & Rose

G.E.Linds.