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The genus
Thelocactus Britton & Rose, Bull. Torrey Bot. Club 49: 251 (Aug. 1922).
Type: Echinocactus hexaedrophorus Lemaire.
Torreycactus Doweld, Sukkulenty 1: 19 (1998).
Stem single or clustering, depressed, globose, ovoidal or cylindrical, 3-40 cm tall, 2-20 cm wide. Ribs distinct or indistinct. Tubercles present, rounded to conical. Areoles at the apices of tubercles, sometimes elongated into a short groove, with or without glands. Spines usually straight, variable in diameter, length and colour; radial and central spines generally distinguishable. Flowers apical, funnel-shaped, with a scaled ovary and tube, white, yellow, magenta or rarely orange to red. Fruits greenish to reddish, with the perianth remnants persistent, scaly, dehiscing at maturity by a basal pore. Seeds pyriform, with a basal hilum, black; testa cells tabular, convex or conical, cuticle granular or smooth.
The neotype of Echinocactus hexaedrophorus Lemaire
From: C. Lemaire, Iconographie descriptive des Cactees, Plate 2 (Dec. 1841).
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