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Reederochloa, a new genus of dioecious grasses from Mexico

minate and pistillate spikelets. To determine more precisely the true affinities of this grass, detailed anatomical studies were also undertaken, the results of which conifirmed our original conclusions regarding its relationships. Although allied to such genera as Distichlis, along with Jouvea and Monanthochloe, it appears to be sufficiently distinct to warrant descriptioni as a new genus. A search through the undetermined grasses at the United States National Herbarium yielded an additional collection of the genus, also from alkali flats but from the state of San Luis Potosi. Unfortunately, only pistillate plants were represented. Most recently, through the courtesy of Dr. Jerry Rzedowski, Instituto Politeenico Nacional, Mexico, D.F., specimens of the grass from his extensive collections of the state of San Luis Potosi have been received, and these include both male and female plants. The genus at present is therefore represented by complete collections