Gymnocactus Backeberg (1938)

(Greek gymnos = naked, Latin cactus = cactus)
naked (fruits) cactus
small, roundish, partly clumping, with dainty tubercles, crown with bright wool
to 20 spines, radial, bright
flowers appears on a longish areole, small, purple, pink or white, ovary bare
seeds dull black

Highslide JS
 

Distribution

 north-east Mexico to central Mexico - Zacatecas to Hidalgo
very warm steppes

Growth period

 bright and warm, not in full sun, somewhat half shady
somewhat sensitive against moisture therefore only seldom watering

Winter period

 dry and bright at 8–10°C (46–50°F)
to constitute flowers requires the early blooming plants in late winter
and early springtime somewhat more of moisture

Substrat

 minerally and permeable for water with some of loam
   
Gymnocactus viereckii var. major C. Glass & R. A. Foster (1978)
 
Highslide JS
   Highslide JS   Highslide JS
         

Habitat

Mexico
Nuevo León, San Luis Potosí

Description

usually simple 4–6.5 cm (1.5–2.5 in) Ø
13–16 radial spines
flowers white

Synonyms

 Thelocactus viereckii var. major (C. Glass & R. A. Foster) H. Bravo (1980)
Turbinicarpus viereckii var. major (C. Glass & R. A. Foster) John & Ríha (1983)
Neolloydia viereckii var. major (C. Glass & R. A. Foster) E. F. Anderson (1986)
Pediocactus viereckii var. major (C. Glass & R. A. Foster) Halda (1998)
Gymnocactus viereckii ssp. major (C. Glass & R. A. Foster) Doweld (2000)
Turbinicarpus viereckii ssp. major (C. Glass & R. A. Foster) C. Glass (1997)

CITES

 Appendix II since 01. July 1975; Appendix I since 11. June 1992
 
Description of "Kakteen von A bis Z" by Walter Haage with courtesy by Kakteen-Haage made available.

 

 

↑
www.Kakteensammlung-Holzheu.de