GRAMINACEAE (GRASS FAMILY) 45 



N. Lemma 2-toothed at apex, mostly awned from just below the apex; stigmas 



arising below apex of ovary. BROMUS (p. 46) 



NN. Lemma not 2-toothed at apex; lemma awn none or at the very apex; 



stigmas arising at apex of ovary. 



O. Lemma acute, often awned, not scarious at apex; lemma veins not promi- 

 nent. FESTUCA (p. 45) 

 OO. Lemma obtuse, awnless, scarious at tip. 



P. Lemma prominently s-g-veined; style present; lodicules united. 

 (Gk. glykeros = sweet; referring to the taste of the grain.) 



Glyceria (MANNA GRASS) 



PP. Lemma obscurely 3-veined; style none; lodicules separate. (Honor 

 of B. Puccinelli, an Italian botanist.) Puccinellia (SPEAR GRASS) 



POA (BLUE-GRASS) 



Spikelets 2-io-flowered ; panicle usually loose and spreading, rarely narrow 

 and spikelike. Glumes acute or obtuse. Lemma delicately scarious- 

 margined, mostly scarious-tipped, usually surrounded by a few woolly hairs. 

 Palet 2-toothed. (Gk. poa = grass, or fodder in general.) A very diffi- 

 cult and numerous genus. Only 7 of the most useful ones are given, and 

 the key separates only those. (F. & R. pp. 57-61.) 



The wild ones are range grasses. 



A. Lemma with long spider-weblike hairs at base. 



B. Stem flat, 2-edged; panicle 1-4 cm. long, flat; lower glume 3-veined. W. E. 



A common lawn grass. P. compressa (CANADA BLUE-GRASS) 

 BB. Stem terete; panicle 5-10 cm. long, not flat; lower glume i-veined. W. C. E. 



Common pasture and lawn grass. P. pratensis (KENTUCKY BLUE-GRASS) 

 AA. Lemma without spider-weblike hairs at base. 



C. Lower glume i-veined. E. P. sandbergii 

 CC. Lower glume 3-veined. 



D. Stems coarse, 6-10 dm. high; plant glaucous. 



E. Leaves rolled up; glumes and lemmas unequal. E. P. laevigata 

 EE. Leaves flat or folded; glumes and lemmas nearly or quite the same length. 



E. P. nevadensis (NEVADA BLUE-GRASS) 



DD. Stem not coarse, 2-7 dm. high. 



F. Panicle loose, its branches spreading or ascending. E. P. wheeler 

 FF. Panicle dense, its branches erect or very short. 



P. buckleyana (BUNCH REDTOP) 



FESTUCA (FESCUE) 



Spikelets 2- to many-flowered, in racemes or panicles ; flowers perfect or 

 the upper one staminate. Glumes keeled, equal or unequal, the lower 

 i-3-veined, the upper 3~5-veined. Lemma 5-veined. Stamens 1-3. 

 Grain glabrous. (L. festuca = a stalk or straw ; hence applied to a straw- 

 like grass growing in barley.) Mostly range grasses. Only 6 of the most 

 important are given, and the key separates only those. (F. & R. pp. 62-64.) 



A. Annual; stamens i or 2. 



B. Spikelets 8-i3-flowered. F. octoflora (SLENDER FESCUE) 



BB. Spikelets i-4-flowered. F. microstachys (SMALL FESCUE) 



AA. Perennial; stamens 3. 



