Thelocactus rinconensis (Cactaceae). It is native to mexico. It is usually solitary, develops a squat and highly ribbed stem with a? flattened top, up to 20 cm in diameter.? It can have either a glaucous-grey or green epidermis and the spines are long. Sowing : Sow seeds in summer. Locality : Ex Hort. Date of harvest : May 2013.