1896. ] New North American Grasses. 139 
flabelliform clusters, but the awns of the flowering glume are 
much shorter, as are also the more numerous awns of the rudi- 
mentary florets above. These multi-awned glumes also sug- 
described with Atheropogon stolonifer Fourn., the characters 
of which, as given by Fournier (Mex. Pl. Enum., Gram. 140), 
sexual character. Fournier’s specimens, (Liebman no. 588) 
were collected in the same region, a fact which renders the 
identity still more probable. 
Division of A Lrostology, 
U. S. Department of Agriculture, 
Washington, D. C. 
EXPLANATION OF PLates XI-XIII. 
Plate XT. Avena Mortoniana Scribner. 
Plate X1Y. Zeugites smilacifolia Scribner. 
Plate XTIT. Pringleochloa stolonifera Scribner. 
8-4. Staminate spikelet, showing the back of the second glume, 
- Fig. 6. Empty glumes of the staminate spikelet, more highly 
enified. Fig. c. Lower part of the staminate floret, showing the 
of 4 Owering glume of the staminate spikelet. Fig. ¢. First glume 
Pistill Pistillate spikelet. Fig. £ Second glume of the same. Fig. 
: . ate spikelet, dorsal view, empty glumes removed. — the 
h « female floret. F ig. 2. Fourth glume of the pistillate mee 
to Bl umes above these have successively fewer arms. Fig. 4. Rachis, 
which were attached three female spikes. 
