Twenty-fib ST Annual Meeting. 93 



in. Culms erect, 2-4 ft. high; root perennial (n). 



VI. Culms geniculate at the decumbent or procumbent base; annual 19 



n. Culms stout, much branched above, spikelets racemose, crowded, mostly one-sided 18 



n. Culms less stout, apex of spikelets a little curved 17 



15. Panician glabrum G&Md..; smooth Panic grass. 



16. P. sanguinale L.; Crab grass; Finger grass. 



17. P. ayiceps Mx.; two-edged Panic grass. 



18. P.'agrostoides Spreng.; red-top Panic grass. 



19. P. proliferurn Jja.m.; branching Panic grass. 



20. P. capillare L.; Old Witch grass; hair-stalked Panic grass. 



21. P. autumnale Bosc; Autumn Panic grass. 



22. P. virgaturn Ij.; Switch grass. 



23. P. latifolium L.; Broad-leaved Panic grass. 



24. P. clandestinum L.; Panic grass. 



25. P. microcarpon Muhl.; Panic grass. 



26. P. xanthophynum Gr.; Panic grass. 



27. P.visciduni'EtW.; Panic grass. 



28. P. scoparium Lam.; Panic grass. 



29. P. dichotomum L.; Panic grass. 



30. P. depauperatum Muhl.; Panic grass. 



31. P. Crus-galli L.; Barnyard grass. 



32. P. colonum L.; Panic grass. 



6. Setabia Beauv. 



a. Bristles in clusters, roughened or barbed upwards (6). 



a. Bristles single or in pairs, roughened or barbed downwards 33 



6. Spike tawny yellow, bristles G-11, perfect Hower wrinkled 34 



6. Spike green, bristles few, perfect llower less distinctly wrinkled 35 



33. Setaria verticillata Beauv.; Fox-tail grass. 



34. S. glauca Beauv.; Yellow Fox-tail. 



35. S.vividis Beauv.; Green Fox-tail, Pigeon grass, Bottle grass. 



7. Cenchkus L. 

 a. Stems branched and ascending, the fruit a pestiferous bur 36 



36. Cenchrus tribuloides L.; Sand-bur, Hedgehog grass. 



8. ZlZANIA L. 

 a. Upper branches of panicle erect pistillate, lower spreading staminate 37 



37. Zizania aquatica L.; Wild Rice, Indian Rice, Water Oats. 



9. Leeksia Swartz. 



a, Spikelets narrowly oblong, somewhat crowded (6). 



a. Spikelets broadly oval, imbricately covering each other.. 40 



6. Panicle simple, spikelets Ik lines long, stamens two 38 



6. Panicle diffusely branched, spikelets 23-3 lines long, stamens three 39 



38. Leersia Virginica Willd.; White grass. 



39. L. oryzoides Swz.; Cut grass, White grass, False Rice. 



40. L. lenticularis Mx.; Fly-catch grass. 



10. Phalaeis L. 



a. Panicle dense spike-like, oval or oblong (6j. 



o. Panicle branched, the clusters open in anthesis 43 



6. Spike oval, culm one to two feet high 41 



6. Spike oblong, 1-2 (or more) inches long, culm taller 42 



41. Phalaris Canariensis L.; Canary grass. 



