Origin and Habitat: Argentina, Córdoba.

• Gymnocalycium multiflorum (Hook.) Britton & Rose
• Echinocactus multiflorus Hook.

• Gymnocalycium monvillei (Lem.) Britton & Rose
• Echinocactus monvillei Lem.
• Gymnocalycium monvillei var. coloratum Neuhuber
• Gymnocalycium monvillei var. confusa Neuhuber
• Gymnocalycium monvillei subs. gertrudae (Neuhuber) Neuhuber
• Gymnocalycium monvillei var. gertrudae Neuhuber
• Gymnocalycium monvillei var. orientale Neuhuber
• Gymnocalycium achirasense var. orientale (Neuhuber) V.Gapon
• Gymnocalycium monvillei subs. achirasense var. orientale Neuhuber in H.Till & Neuhuber
• Gymnocalycium monvillei var. safronovii V.Gapon
• Gymnocalycium monvillei var. steineri H.Till
• Gymnocalycium multiflorum f. steineri.
• Gymnocalycium multiflorum (Hook.) Britton & Rose
• Echinocactus multiflorus Hook.
• Gymnocalycium multiflorum var. parisiense (K.Schum.) P.Fourn.
• Echinocactus multiflorus var. parisiensis K.Schum.
• Echinocactus multiflorus f. parisiensis (K.Schum.) Schelle
• Gymnocalycium polyanthum var. parisiense (K.Schum.) Y.Itô
• Gymnocalycium ourselianum (Cels ex Salm-Dyck) Y.Itô
• Echinocactus ourselianus Monv., Cels ex Salm-Dyck
• Gymnocalycium multiflorum var. ourselianum (Cels ex Salm-Dyck) H.Till & W.Till

• Gymnocalycium monvillei subs. achirasense (H.Till & Schatzl) H.Till
• Gymnocalycium achirasense H.Till & Schatzl
• Gymnocalycium horridispinum subs. achirasense (H.Till & Schatzl) G.J.Charles
• Gymnocalycium horridispinum var. achirasense (H.Till & Schatzl) Lodé
• Gymnocalycium monvillei var. chacrasense Neuhuber
• Gymnocalycium achirasense var. chacrasense (Neuhuber) V.Gapon
• Gymnocalycium monvillei subs. achirasense var. chacrasense
• Gymnocalycium monvillei var. echinatum Neuhuber
• Gymnocalycium achirasense subs. echinatum (Neuhuber) V.Gapon
• Gymnocalycium monvillei var. kainradliae Neuhuber
• Gymnocalycium achirasense subs. kainradliae (Neuhuber) V.Gapon
• Gymnocalycium monvillei f. villamercedense H.Till & Neuhuber
• Gymnocalycium achirasense var. villamercedense (H.Till & Neuhuber) V.Gapon
• Gymnocalycium villamercedense F.Ritter

• Gymnocalycium monvillei subs. brachyanthum (Gürke) H.Till
• Echinocactus brachyanthus Gürke
• Gymnocalycium brachyanthum (Gürke) Britton & Rose

• Gymnocalycium monvillei subs. horridispinum (G.Frank ex H.Till) H.Till
• Gymnocalycium horridispinum G.Frank ex H.Till

Description: Gymnocalycium multiflorumSN|11443]]SN|11445]] is a local or morphological form of the variable Gymnocalycium monvilleiSN|11445]]SN|11438]] It is is very well-known in cultivation and distinguished from standard Gymnocalycium monvilleiSN|11445]]SN|11438]] for the very attractive dark bluish body and stout large white blooms (not pink). It obtained its name “multiflorum” (Many flowered) for its showy displays of white flowers, however this species rarely lives up to the promise of its name in cultivation, and blooms with moderation only when mature. Several unnecessary varietal names have appeared in the past.
Similar forms: Gymnocalycium multiflorumSN|11438]]SN|11445]] v. parisiense and Gymnocalycium multiflorumSN|11438]]SN|11445]] v. albispinum are both white-spined variants. Gymnocalycium ourselianumSN|11445]]SN|11443]] is probably another variant and was regarded by Backeberg as synonymous with G. multiflorum.
Habit: Simple or eventually forming large clumps.
Stem: Globular or somewhat depressed or sometimes short columnar, 9 cm high or more, sometimes 12 cm in diameter. The epidermis is light-green or bluish-green.
Ribs: 10 to 15, broad at base, somewhat tubercled, especially above, acute.
Areoles: Elliptic, 10 mm Long.
Spines: 7 to 10, all radial, spreading, somewhat flattened, stout, yellowish or whitish with a reddish tinge at the base, the longest one 3 cm long.
Flower buds: Ovoid, covered with imbricate scales.
Flowers: Are some of the largest in this genus, often growing larger than the plant, funnel-shaped 3,5 to 8 cm long and wide candid white(or white flushed with pink) and often double petaled, short campanulate. Inner perianth segments oblong, up to 3 cm long, obtuse or acute. Scales on the ovary broad and rounded, their margins scarious.

Bibliography: Major references and further lectures
1) 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
2) David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006
3) Edward F. Anderson “The Cactus Family” Timber Press, 2001
4) E. W Putnam “Gymnocalyciums: Handbook No. 5.” National Cactus And Succulent Society, Smart & Co. (Printers) Ltd., Brackley, Northants. 1978
5) N.L. Britton, J.N. Rose. "The Cactaceae: Descriptions and illustrations of plants of the cactus family" Volume 3

Cultivation and Propagation: It is a summer-growing species that offers no cultivation difficulty. Water regularly in summer (but do not over-water). Keep rather dry in winter. Feed with a high potassium fertilizer in summer. Hardy as low as -5° C (or less) if kept dry. Sun Exposure: Light shade.
Propagation: Direct sow after last frost or offsets