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The genus Gilia can be divided into four major groups worthy of subgeneric rank. These groups are: (1) the subgenus Greeneophila of Brand, comprising Gilia rigidula and its relatives; (2) Giliandra, treated as a setcion by Gray, and including Gilia pinnatifida, G. stenothyrsa, C. leptomeria and related species; (3) the subgenus Campanulastrum (Brand) Mason and A. Grant, which includes the Gilia campanulata complex; and (4) the subgenus Gilia. The latter, which is the largest and systematically the most complex of the subgenera, may be further subdivided into four natural sections: Gilia, Saltugilia, Gilmania, and Araclmion. It is not the purpose of this paper to discuss the reasons for the classification outlined above, which differs markedly from that of previous authors. This aspect is being dealt with separately in Sy.rtematic Botany and Phytogeography of the Phlox Family (V. Grant, ms. in preparation). The present paper is intended rather to present in outline form a general classification of the subgenus Gilia, as it is now understood, together with certain supplementary notes concerning the individual species. KEY TO THE SECTIONS OF SUBGENUS GILIA