See text Hamatocactus Britton & Rose Thelomastus Fric[1] Thelocactus is a genus of flowering plants in the cactus family Cactaceae.

They are dehiscent through the large basal pore, green to brownish purple [to magenta], spherical to short cylindrical, 5 - 18 x 6 – 17 mm, not juicy, drying immediately after ripening, scaly, spineless, hairless and with floral remnant persistent.

flavidispinus) grows on the other (northern) side of the Rio Grande, well distributed in the Big Bend area of Texas.

The dark brown or black seeds can be relatively large for the size of cactus and they germinate readily.

The seed should be put in a sand and compost mixture, kept moist, maintained at a temperature of 21 °C and placed in a shady position.

[3] The following genera have been brought to synonymy with Thelocactus: This genus contained 8 species and was known from the Southwest United States and in northern Mexico.

Species recognized by Plants of the World Online As of September 2024[update]:[4] Media related to Thelocactus at Wikimedia Commons