MANUAL OF THE GRASSES OF THE UNITED STATES 



77 



lets mostly 5- to 7 -flowered ; lemmas nearly terete, about 7 mm long; 

 awn usually 2 to 4 mm long. 91 (F. ovina yar. ingrata Beal.) 

 Open woods and rocky slopes, British Columbia to Alberta, south 

 to northern New Mexico and Arizona and central 

 California (fig. 105). 



34. Festuca arizonica Vasey. ARIZONA 

 FESCUE. (Fig. 106.) Resembling F. idahoensis; 

 differing in the stiffer glaucous foliage, some- 

 what smaller awnless or nearly awnless lemmas. 

 91 Open pine woods, Arizona, Nevada, New 

 Mexico, and Colorado (fig. 107). Often called 

 pinegrass. 



FESTUCA AMETH^STINA L. 

 Slender tufted perennial; 

 blades filiform, 15 to 25 cm 

 long; panicle 5 to 10 cm long, 

 rather narrow; spikelets about 

 as in F. ovina, often purplish. 

 01 Sometimes cultivated for ornament. Europe. 



FESTTJCA GENICULATA (L.) Cav. Annual; culms slen- 

 der, geniculate below, 20 to 50 cm tall; panicle 3 to 6 cm 

 long, rather compact; spikelets awned. O Some- 

 times cultivated for ornament. Portugal. 



FIGURE 104. Festuca idahoen- 

 sis. Plant, X Yz, floret, X 5. 

 (Heller 3318, Idaho.) 



FIGURE 105. Distribution of 

 Festuca idahoensis 



4. SCLEROPOA Griseb. 



Spikelets several-flowered, linear, somewhat compressed, 

 the thick rachilla disarticulating above the glumes and 

 between the florets; glumes unequal, short, acutish, 

 strongly nerved, the first 1 -nerved, the second 3-nerved; 

 lemmas nearly terete, obscurely 5-nerved, obtuse, slightly 

 scarious at the tip. Annuals with slightly branched 1-sided 

 panicles. Type species, Scleropoa rigida. Name from 

 Greek skleros, hard, and poa, grass, alluding to the stiff 

 panicle. 



1. Scleropoa rigida (L.) Griseb. (Fig. 108.) Culms 

 erect or spreading, 10 to 20 cm tall; blades flat, 1 to 2 mm 

 wide; panicles narrow, stiff, condensed, 5 to 10 cm long, 

 the branches short, floriferous to base, these and the thick 

 pedicels somewhat divaricately spreading in an thesis; 

 spikelets 4- to 10-flowered, 5 to 

 8 mm long; glumes about 2 mm 

 long; lemmas about 2.5 mm long. 

 O Waste places and fields, 

 sparingly introduced from Europe, FlGUBE 106 _ 

 Massachusetts; Florida to Missis- Festuca an 

 sippi; South Dakota; Washington 

 to California. 



B 



FIGURE 107. Distribution of 

 Festuca arizonica. 



zonica. Pani- 

 cle, X Yti 

 floret, X 5. 

 (Leiberg 5685, 

 Ariz.) 



5. PUCCINELLIA Parl. ALKALI-GRASS 



Spikelets several-flowered, usually terete or subterete, the rachilla 

 disarticulating above the glumes and between the florets;* glumes 

 unequal, shorter than the first lemma, obtuse or acute, rather firm, 



