Twenty-fibs T Annual Meeting. 95 



/. Outer glumes bristle-pointed, nearly as long as the flowering glume 60 



/. Outer glumes short-pointed, half the length of the flowering glume 62 



/. Outer glumes extremely minute, the lower obsolete; culms much-branched 65 



57. Muhlenberg ia sobolifera Trin. 



58. M. glomerata Trin.; Spiked Muhlenbergia. 



59. M. Mexicana Trin.; Mexican Muhlenbergia. 



60. M. sylvatica T. <fe G.; Wood grass. 



61. M. comata Benth.; Woolly Muhlenbergia. 



62. M. Willdenovii Trin.: Willdenows Muhlenbergia. 



63. M. diffusa Schr.; Nimble Will, Wire grass. 



64. M. capillar is Kunth.; Hair grass. 



16. BRACHyELYTKUM Bcauv. 

 a. Culms 1-3 ft. high, creeping root-stocks, downy sheaths 65 



65. Brachyelytrum aristatum Beauv. ; Short-gluined grass. 



17. Phleum L. 

 a. Spike cylindrical elongated, outer glumes ciliate and bristle-pointed 66 



66. Phleum iiratense L.; Timothy, Herd's grass, Cat's-tail grass. 



18. Alopecueus L. 



a. Stems upright, .t-2 feet high (6). 



a. Stems decumbent, bent at the lower joints (c). 



6. Stems i-2 feet high, outer glumes with long hairs on the back 67 



6. Stem about 2 feet, high, awn exserted more than half its length 68 



c. Awn from (near base of) outer glume projecting half its length 69 



c. Like the last, but glaucous, and awn shorter and arising higher 70 



67. Alopecurus alpinus Sm.; Alpine Fox-tail. 



68. A. piratensis 1j.\ Meadow Fox-tail. 



69. A. geniculatus L,; Water Fox-tail. 



70. A. aristulatus Mx. ; Short-bearded Fox-tail. 



19. Sporobolus R. Br. 



a. Panicles spiked or contracted (6). 



a. Panicles generally open (g). 

 b. Outer glumes very unequal (c). 

 6. Outer glumes somewhat equal (d). 



c. Culms I5-4 feet high, leaves long (d). 



c. Culms (6-12 inches high) and leaves very slender, root perennial 74 



d. Spikelets 2-3 lines long, lowest leaves rigid, rough on edges 72 



d. Spikelets less than one line long, narrow, lowest glume obtuse or truncate 71 



e. Root annual, culms ascending, grain linear 73 



e. Root perennial (/). 



/. Outer glumes very acute, flowering glume cuspidate 74 



/. Outer glumes obtuse, panicle of few solitary distant erect rays 75 



(/. Outer glumes purplish, very unlike, upper ovate, grain round 75 



g. Not as above (/*). 



h. Rays of panicle verticillate, 8 (or more) at base, fewer above 79|- 



k. Rays of panicle in pairs or solitary (t). 



('. Outer glumes very unequal {/). 



i. Outer glumes nearly equal, stems 6-I0 inches, branched or decumbent 79 



j. Rays of panicle flower-bearing to base, sheaths stronglj'-bearded at throat 77 



J. Rays naked below, sheaths with a few long hairs at throat 78 



71. Sporobolus Indicus R.Br.; Smut grass. 



72. S. asper Kunth.; Rough Drop-seed grass. 



73. S. vaginaefloriis Torr. ; Drop-seed grass. 



74. S. cuspidahis Torr.; Drop-seed grass. 



