To the curators of the above institutions I express appreciation for the privilege of examining specimens in their charge.I am grateful also to Mr. George R. Proctor of the Academy of Natural Sciences at Philadelphia for information concerning the type of Monolopia Heermannii Durand, also to Mr. John Thomas Howell of the California Academy of Sciences and to Mr. Frank ''V.Peirson of Altadena for material of and notes on Oenothera heterochroma.
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Philip Munz (1949) studied this question.