TWENTY-FIBST 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 63 



57. Mnhlenbergia sobolifera Trin. 



58. M. glome rata Trin.; Spiked Muhlenbergia. 

 5{). M. Mexicana Trin.; Mexican Muhlenbergia. 



60. M. sylvatica T. &, 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. capillaris Kunth.; Hair grass. 



16. Bbachi:elytrum Beauv. 

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



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



17. Phleum L. 

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



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



18. Alopecubus L. 



a. Stems upright, i-2 feet high (b). 



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



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



b. 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 



f>7. Alopecurus alpinus Sm.: Alpine Fox-tail. 



68. A. pratensis L.; Meadow Fox-tail. 



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



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



19. Sporobolus R. B 



a. Panicles spiked or contracted (6). 



a. Panicles generally open (g). 

 b. Outer glumes very unequal (c). 

 b. Outer glumes somewhat equal (d). 



c. Culms li— 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 7-i 



/. Outer glumes obtuse, panicle of few solitary distant erect rays 7 r > 



y. Outer glumes purplish, very unlike, upper ovate, grain round 76 



g. Not as above (h). 



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



h. Rays of panicle in pairs or solitary i . 



i. Outer glumes very unequal (j). 



i. < Hiter glumes nearly equal, stems 6-15 inches, branched or decumbent 79 



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



/. Rays naked below, sheaths with a few long hairs at throat 7^ 



71. Sporobolus Indicus R. Br.: Smut gras-. 



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



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



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



