This member of the Portulacaceae family was given this name by Gordon Douglas Rowley in 1994. It is found in north-eastern Mexico, growing in a very well drained soil with some water and some sun. The stems will raise for tvelwe centimetres, the flowers are pink, and the plant can be reproduced both by seeds and cuttings. The genera is named after Scottish borne Robert Graham, 1786-1845, once director of Edinburgh Botanical Garden. The species name after the area it was found in: Coahuila.