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Shamalo-grass. Panicum frumentaceum. 
Sheep's Fescue. Festuca orina. 
Shining Spike-grass. Uniola nitida. 
Short-leafed Beard-grass. Gymnopogon brevifolius. 
Short-stalked Meadow-erass. Fragrostis frankii. 
Siberian Lyme-grass. Hlymus sibiricus. 
Side Oats.  Houteloua racemosa. 
Silk-grass. Ayrostis scabra. 
Silky-flowered Oat-grass. Danthonia sericea. 
Heads. Andropogon bombycinus. 
Silver Beard-grass. Andropogon argyraus; A, saccharoides. 
Tussock. Poa cespitosa var. 
Simpson's-grass. Panicum curtisii. 
Six-weeks-grass. Poa annua. Name applied in the Southwest to any low, quick- 
growing annual grass. 
Sleepy-grass. Stipa viridula. 
Slender Cord-grass. Spartina gracilis. 
Crab-grass. Panicum filiforme. 
Fescue. Festuca tenella; Festuca tenuifolia. 
Foxtail. Alopecurus agrestis. 
Meadow-grass. Eragrostis pilosa. 
Spike-grass. Uniola gracilis. 
Tail-grass. Schedonnardus texanus. 
Slough-grass. Beckmaunia eruce formis; Spartina cynosuroides. 
Small Cane. Panicum divaricatum ; Arundinaria tecta. 
Fescue. Festuca microstachya. 
flowered White-grass. Leersia rirginica. 
Mountain Rice. Oryzopsis canadensis. 
Reed-grass, Canadian. Calamagrostis canadensis, 
Smaller Blue-grass. Poa compressa. 
Smooth Brome-grass. Bromus racemosus; B. inermis. 
Chloris. Chloris glauca. 
Marsh-grass. Spartina alterniflora. 
Meadow-grass. Poa pratensis. 
Paspalum. Paspalum lære. y 
Rye- grass. Elymus virginicus. 
-stalked Meadow-grass. Poa pratensis. + 
Smut-grass. Sporobolus indicus. 1 
Snow-grass. Danthonia Havescens. z 
Soft Brome-grass. Bromus mollis. 
Chess. Bromus mollis. 
-grass, Creeping. Holcus mollis. 
Meadow. Holcus lanatus. 
Woolly. Holcus lanatus. 
Sea Lyme-grass. Elymus mollis. 
Sorghum Millet. Andropogon sorghum var. 
