64 Graminaceae 
UU. Leaves and spikelets glaucescent. E. 
F. rubra glaucodea Pip. 
TT. Inflorescence very dense; stem-leaves rolled up. 
X. Leaves green; spikelets glabrous or glaucous. W. 
F. rubra densiuscula Pip. 
XX. Leaves very glacous; spikelets very glacous. W. (F. rubra 
littoralis.) F, rubra pruinosa Hack. 
SS. Spikelets pubescent with short hairs. W.E. (F. rubra pubescens.) 
F. rubra kitaibeliana Pip. 
RR. Leaf-blades scabrous at margin or in their upper portion; young shoots 
arising within the leaf-sheath; spikelets not glaucous. 
Y.  Panicle-rays not cushioned at base; spikelets 57.5 mm. long; glumes 
both linear-lanceolate, neither over 3 mm. long; lemma 3—-3.5 mm. 
long. (Varieties of F’. ovina, the Sheep Fescue.) 
Z. Leaf-blades capillary, 0.3—0.6 mm. wide. 
a. Plant 20—60 cm. high; panicle 2—I2 cm. long. W. 
F. ovina sciaphila 4. & G. 
aa. Plant 12—30 cm. high; panicle 2—4 cm. long. W. C. E. 
F, ovina supina Hack. 
ZZ. Leaf-blades wider. 
b. Leaf-blades green, smooth. E. (F. brevifolia.) 
F. ovina brachyphylla Pip. 
bb. Leaf-blades pale or glaucescent, usually scabrous. 
c. Awn nearly equaling the lemma; leaf-sheath becoming spread 
out at base. C. E. (F. ovina columbiana; F. ovina oregana.) 
F. ovina ingrata Hack. 
cc. Awn 1/5—1/3 as long as the lemma; leaf-sheath not becom- 
ing spread out at base. (F. arizonica.) 
F. ovina arizonica Hack. 
YY. Rays of the panicle cushioned at the base; spikelets 8—12 mm. 
long; glumes wider, often at least one of them more than 3 mm. long; 
lemma 6—7 mm. long. 
d. Lemma glabrous; panicle 1|0—15 cm. long. C. E. 
F, viridula Vas. 
dd. Lemma appressed-hispidulous; panicle 8—10 cm. long. U. 
F. howellii Hack. 
QQ. Leaf-blades eventually dropping from their sheaths; palet notched at apex. 
e. Panicle 4—15 cm. long; ligules not conspicuously hairy. E. 
F. hallii Pip. 
ee. Panicle 10—30 cm. long; ligules conspicuously hairy. (See f.) 
PP. Leaves flat, wide; plants not densely tufted. 
f. Stems mostly 2-jointed; upper glumes 1/5 longer than the lower; lemma 
scabrous all over the back; palet notched at apex. U. (F. californica.) 
F. aristulata Shea. ; 
ff. Stems mostly .3—4-jointed; upper glume | /3 longer than the lower; lemma 
scabrous near the tip; palet notched at apex. W. E. 
F. elatior L. (Tall Fescue) 
fff. Stems mostly 2-jointed; upper glume 1/ longer than the lower; lemma scab- 
rous all over the back; palet obtuse. E. 
F. confinis Vas. 


