Crocus
The information here given is based upon Mr. George Maw's magnificent "Monograph of the Genus Crocus," published in 1886. By the assistance of the following "key" to the grouping of the Crocuses in cultivation, the name of any species may be the more readily determined. The number of species described by Mr. Maw is sixty-seven: of these about seventeen are lost to cultivation, or await introduction to this country. C. aerius, C. ancyrensis, C. Fleischeri, C. nevadensis, and C. ochroleucus require a cold frame to bring them to perfection.