TWENTY-FIBST ANNUAL MEETING. 99 



44. DiABBHENA Raf. 



a. simple culm with long, linear-lanceolate flat leaves at base 127 



127. Diarrhena Americana Beauv. 



45. Uniola L. 



a. The very broad, flat spikelets on drooping pedicels 128 



128. Uniola latifolia Mx.; Broad-flowered Fescue grass. 



46. DiSTicHLis Raf. 

 a. Leaves rigid and sharji-pointed, glumes many-nerved, coriaceous 12& 



129. Distichlis maritima Raf.; Salt grass, Marsh grass. 



47. Daotylis L. 

 a. Upper branches of panicle short, lower, longer and spreading 130 



130. Dactylis glomerata L.; Orchard grass, Cock"s-foot grass. 



48. PoA L. 



a. Flowering glumes compressed-keeled, acute (c). 

 a. Flowering glumes rounded on the back, obtuse (6). 



6. Spikelets 3-7-flowered, outer glumes acute, rough on the back 131 



b. Spikelets mostly 3-flowered, outer glumes very acute, rough on the mid-nerve 132 



c. Low and spreading, 3-6 in. high, from an annual or biennial root, flaccid 133 



c. Culms 6-20 in. long, geniculate-ascending, rigid, very much flattened 134 



d. Spikelets mostly numerous, and crowded on rather short, rough branches (e). 



d. Spikelets fewer and more scattered on slender pedicels, flowering early (/). 



e. Llgules elongated, flowering glume very obscurely nerved, spikelets narrow 135 



e. Ligules short and blunt, flowering glume 5-nerved, hairy along the margin and keel 136 



e. Ligules oblong, acute, flowering glume prominently 5-nerved, naked at the margins 137 



/. Spikelets 3-4 lines long, flowering glume conspicuously scarioiis-tipped 140 



/. Spikelets 1-2 lines long, flowering glume scarcely scarious-tipped (^r). 



g. Flowers oblong, obtuse, branches of panicle in fives or more 138 



g. Flowers and glumes acute, branches of panicle in threes or fours 139. 



131. Poa andina Nutt.; Mountain Spear grass. 



132. P. temiifolia Nutt.; Oregon Blue grass. 



133. P. annua L.; Annual Spear grass, Goose grass. 



134. P. compressa L.; Wire grass, Blue grass. 



135. P. serotina Ehr.; Fowl Meadow grass, False Red-Top. 



136. P. pratensis L.; June grass, Ky. Blue grass. Spear grass, Mea'dow grass. 



137. P. trivialis L. ; Rough-Stalked Meadow grass. 



138. P. sylvestris Gr.; Meadow grass, Spear grass. 



139. P. alsodes Gr.; Tall Blue grass. Wood Spear grass. 



140. P. flexuosa Mnhl.; Meadow grass. Spear grass. 



49. Glyoebia R. Br. 



a. Flowering glume conspicuously nerved, styles present (6). 



a. Flowering glume inconspicuously o-nerved, stigmas nearly sessile 145 



b. Spikelets linear, i inch long, appressed, terete; panicle narrow 144 



b. Spikelets ovate, oblong, or liuear-oblong, 1-3 lines long (c). 



c. Spikelets ovate, at length very broad and tumid, 2 lines long 141 



c. Spikelets very numerous, ovate-oblong, 3-7 flowered, 1-2 lines long 142 



c. Spikelets oblong, or linear-oblong, 5-9 flowered, about 3 lines long 143 



141. Glyceria Canadensis Trin.; Rattlesnake grass. Tall Quaking grass. 



142. Gr. nervata Trin.; Nerved Meadow grass. Nerved Manna grass. 



143. G. aquafica Sm.; Reed Meadow grass. White Spear grass. 



144. G.fluitansR.Br.; Floating Manna grass. 



145. G. distans Wahl.; Manna grass. 



