104 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Lemmas awn-pointed........-........ Dacty is (p. 128). 
Lemmas pointless. 
Glumes 1 to 3-nerved......2.....- Poa (p. 128). 
Glumes 5-nerved or more......... DisTicuis (p. 135). 
Lemmas convex or rounded on the back. 
» Lemmas acute or awned_.............. Festuca (p. 135). 
Lemmas obtuse and scarious at apex. 
Prominently 5 to 7-nerved......... PanicuLaria (p. 139). 
Obscurely 5-nerved......2.....--- PUCCINELLIA (p. 141). 
CHLORIDEAE, 
Pedicel jointed above the persisting glumes; spikes digitate..... CAPRIOLA (p. 146). 
Pedicel jointed below the glumes. 
Spikelets much flattened; glumes unequal, keeled... .....- SparTINA (p. 145), 
Spikelets subterete; glumes equal, convex........-...--- BECKMANNIA (p. 145). 
HORDEAE. 
Spikelets mostly solitary at each joint of the rachis. 
Spikelet 1-flowered ..........-222-. 0202222 SCRIBNERIA (p. 146). 
Spikelet several-flowered. 
Placed edgewise on the rachis ...........-.222.-.-.- Louium (p. 146). 
Placed flatwise on the rachis ............2...-.22--- AGROPYRON (p. 146). 
Spikelets two or more at each joint of the rachis. 
Spikelets 1-flowered ...-. 22222-22222 2-00-2222 eee eee Horpevo (p. 149). 
Spikelets 2 to many-flowered. 
Rachis continuous ........... 222222222222 222. ee eee Exymus (p. 150). 
Rachis readily separating into joints. ......2..2-...-. SITANION (p. 153). 
HOMALOCENCHRWUS. 
1. Homalocenchrus oryzoides (L.) Poll. Hist. Pl. Palat. 1: 52. 1776. 
Leersia oryzoides Sw. Prod. Veg. Ind. Occ. 21. 1788. 
Phalaris oryzoides 1. Sp. Pl. 1: 55. 1753. 
Type Loca.ity: “ Habitat in Virginiae paludibus nemorosis.” 
Rance: Newfoundland to Washington, south to Florida, Texas, and California. 
SPECIMENS EXAMINED: Seattle, Piper in 1889; North Yakima, Leckenby, August, 1897. 
ZONAL DISTRIBUTION: Transition and Upper Sonoran. 
PASPALUM. 
1. Paspalum distichum L. Amoen. Acad. 5: 391. 1759. 
TYPE LOCALITY: Jamaica. 
SPECIMENS EXAMINED: Along Columbia River, Leckenby, October, 1900; Klickitat County, 
Suksdorf. 
Introduced along the banks of the lower Columbia River. 
SYNTHERISMA. 
1. Syntherisma sanguinale (L.) Nash, Bull. Torr. Club 22: 420. 1895. | CRABGRAss. 
Panicum sanguinale L. Sp. Pl. 1: 57. 1753. 
Digitaria sanguinalis Scop. F), Carn. ed. 2. 1: 52. 1772. 
Syntherisma praecor Walt. F. Car. 76. 1788. 
Type Locaity: “Habitat in America, Europa australi.”’ 
SPECIMENS EXAMINED: Pullman, Piper 1920. 
