Dyckia minarum Mez

Literature references:

FCBS (Web) Foster 19??: fig.2 Leme & Marigo 1993: 64 Mez 1894: 91 NY Bot. Garden Padilla 1966: 71b Reitz 1983: 49 Smith & Downs 1974: 532 U.S. Nat. Herb.