24 
43. P. viscidum Ell. 
44, P. commutatum Schultes, 
45, P. clandestinum Linn. 
(d) Panicle larger, oval, or oblong. 
46. P. latifolium Linn. 
47. P. scabriusculum Ell.? Chapm. 
(e) Panicle effuse ; branches capillary and much subdivided, except in P. sparsiflorum (P 
angustifolium Chapm. 
48. P. capillare Linn. 
49. P, capillarioides Vasey. 
50. P. autumnale Bosc. 
ol. P. Hallii Vasey & Scrib. 
52. P. proliferum Lam. 
53. P. miliaceum Linn, 
54. P. verrucosum Muhl, 
55. P. sparsiflorum. 
(f) Tall grasses, with ample and diffuse panicle. 
56. P, anceps. Michx. 
57. P. agrostoides Muhl. 
58, P. bulbosum H. B. K. and var. avenaceum. 
59. P. maximum Jacq. 
60. P. amarum Ell. 
61. P. virgatum Linn. 
62. P. Havardii Vasey. — 
§ 8. FRUTESCENTES Vasey. 
Culms frutescent, spikelets large and turgid, empty glumes loose. 
63. P. divaricatum Linn. 
§ 9. VILLIFLORA Vasey. 
Panicle diffuse, spikelets very large, the glumes very silky-villous. 
64. P. Urvilleanum Kth. 
§ 10. ECHINOCHLOA Benth. 
Spikelets densely crowded in 3 or 4 rows, along the simple, alternate 
spikes or branches of the panicle; empty glumes scabrous or hirsute, 
acute or sometimes long awned. 
65. Panicum colonum Linn. 
66. Panicum Crus-galli Linn. 
§ 11. HYMENACHNE Benth. 
The small very numerous spikelets usually crowded in a long cylin- 
drical spike or confined panicle; outer glumes acuminate, the second 
twice as long as the fruiting ones, gibbous at the base, 
67. P. gibbum Ell. 
$1. DiciTaRria Benth. 
1. P.glabrum Gaudm. (Gray’s Manual, 6th ed., p. 630), (Digitaria humifusa Pers. ) 
Culms spreading, prostrate or erect, 5 to 12 inches long; leaves 1 to 2 inches long, 
smooth or pubescent; spikes 2 to 6, spreading, 1 to 2 inches long, approximate; spike- 
