BRASIL. Mato Grosso. Jacobina, 10 July 1892, Kuntze s n (NY, holotypus);Camizao, vertical walls of red sandstone, 24 September 1940, M B. & R.Foster 1082 (GH, US).; Jaciara to Rondonopolis, July 1968, Reitz 6891 (HBR, US); Mun. Aquiduana, Piraputanga, Lajeados do arenito (xerofito), flor creme, petalas amarela, 11/VIII/1970, Hatschbach a Guimaraes 24566 (MBM, US); Serra da Bodoquena, cult. 25.7.1978, R. Burle¬Marx s n (HB, emendationis basis).
Originally we planned to describe Burle-Marx Br.7 as a new species because its exserted stamens immediately distinguished it in recent keys from all other species except D. insignis Hassler and D. exserta L.B.Smith. From these it differs in its very short pedicels and dense¬ly lepidote inflorescence.
However, it became evident that the flowers of the type of Dyckia ferruginea Mez were all immature and indistinguishable from those of the immature apex of Burle-Marx Br.7. The areas of Dyckia ferruginea, insignis and exserta indicate that the character of exserted stamens is probably of taxonomic value. —SeeSmith & Downs 1974
