Origin and Habitat: Mexico, San Vicente at Salamanca, valley of Jaumave, Tamaulipas.

• Turbinicarpus saueri (Boed.) V.John & Říha
• Echinocactus saueri Boed.
• Gymnocactus saueri (Boed.) Backeb.
• Neolloydia sauerii (Boed.) F.M.Knuth
• Pediocactus saueri (Boed.) Halda
• Thelocactus saueri (Boed.) Borg

• Turbinicarpus saueri (Boed.) V.John & Říha
• Echinocactus saueri Boed.
• Gymnocactus saueri (Boed.) Backeb.
• Neolloydia sauerii (Boed.) F.M.Knuth
• Pediocactus saueri (Boed.) Halda
• Thelocactus saueri (Boed.) Borg
• Turbinicarpus saueri subs. nelissae Halda & Panar.
• Gymnocactus preenii (Glass) nov. comb. ined.
• Turbinicarpus preenii Glass

Description: Solitary.
Stem: Grey green to bluish, depressed globose, 4 cm tall, 6 cm diameter. Apex woolly.
Ribs: Divided in 6-sided angular tubercles, rounded above, in 8 and 13 series, 2-5 mm long, up to 8 mm broad;
Areoles: Round, at the apex with very much white wool.
Radial spines: About 7-14(or more), horizontally spread out, needle-like, but somewhat curved down and to the body, glassy white, some with brown tips, 5-15 mm long
Central spine: One (occasionally up to 3) curved upward and/or tortuous, only somewhat thicker than the radial spines, 1,5-2 cm long (occasionally more), greyish, dark brown or black (often with a paler base), covered with whitish scales below.
Flowers: Several at the apex, funnel-shaped, white with a faint pinkish midstripe about 15 mm long and 20 mm in diameter. Anther golden brown.
Fruit: Whitish to brownish, small and hidden in the apical wool, 4-7 mm long, 3-5 mm in diameter.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) Nathaniel Lord Britton, Joseph Nelson Rose “Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family” vol. 4 The Carnegie Institution of Washington, Washington 1923
3) 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
4) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006

Cultivation and Propagation: Robust species to cultivate. It has a tap root, and watering it properly is often difficult and rot if over-watered. The fact that the plant retracts into the soil between watering, is perfectly natural and doesn’t cause any damage. keep dry in winter or when night temperatures remain below 10° C, it is hardy to -4°C for a short period. Assure a good ventilation.
Exposures: Full sun where it obtains a flat natural looking or part sun.