TWENTY-FIB ST ANNUAL MEETING. 93 



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



m. 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. Panicum glabrum Gaud.; smooth Panic grass. 



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



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



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



19. P. proliferum Lam.; branching Panic grass. 



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



21. P. autumnale Bosc; Autumn Panic grass. 



22. P.virgatumlj.; Switch grass. 



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

 21. P. clandestinum L.; Panic grass. 



25. P. microcarpon Muhl.; Panic grass. 



26. P. xanthophysum Gr.; Panic grass. 



27. P. viscidum Ell.; Panic grass. 



28. P. scoparium Lam.; Panic grass. 



29. P. dichotomum L.; Panic grass. 



30. P. depauperatum Muhl.; Panic grass. 



31. P. Cms -galli Li.; Barnyard grass. 



32. P. colonum L.; Panic grass. 



6. Setakia Beauv. 



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



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



b. Spike tawny yellow, bristles 6-11, perfect flower wrinkled 34 



b. Spike green, bristles few, perfect flower less distinctly wrinkled 35 



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



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



35. S. viridis 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. Zizania 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 (b). 



a. Spikelets broadly oval, imbricately covering each other 40 



6. Panicle simple, spikelets 1£ lines long, stamens two 38 



b. Panicle diffusely branched, spikelets 2^-3 lines long, stamens three 39 



38. Leersia Virginica Willd. ; White grass. 



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



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



10. Phalakis L. 



a. Panicle dense spike-like, oval or oblong (b). 



a. Panicle branched, the clusters open in anthesis 43 



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



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



41. Phalaris Canariensis L.; Canary grass. 



