130 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Panicles close. 
Lemmas scabrous; leaves very 
scabrous. ......-...--------- 30. P. cottoni. 
Lemmas smooth; leaves smooth. 31. P. cusickii. 
Leaves not filiform. 
Stems low, 5 to 20 cm. high; grasses 
of the highest mountains. 
Leaves soft; panicle purple, very 
short; plants 5 to 10 em. high. 32. P. lettermani. 
Leaves rather rigid; panicle pale, 
narrow, elongated; plant 10 to 
20 em. high........2........ 33. P. suksdorpi. 
Stems taller, usually 20 to 40 cm. 
high; mostly grasses of rupestrine 
habitat. 
Panicle close, erect; leaves flat. 
Lemmas pubescent at base; 
leaves rather narrow, some- 
times folded. ........---- 21. P. sandbergii. 
Lemmas glabrous; leaf 
blades broader. 
Leaf blades soft... .. . 22. P. paddensis. 
Leaf blades firm, very 
short............-.- 23. P. curtifolia. 
Panicles loose; leaves narrow, 
flat or involute. 
Ligules of the sterile shoots 
obsolete; of the culm leaves 
short and truncate... ... 24. P. 
Ligules well developed on all 
the leaves. 
Low plants 5 to 10 cm. 
high; panicle small, 
with divaricate rays 
and few spikelets... . 25. P. vaseyochloa. 
Taller; 10 to 30 cm. 
high; — panicle less 
spreading, with many 
spikelets. 
Panicle loose; 
glumes thin, 
blades involute.. 26. P. gracillima. 
Panicle close; 
glumes firm, 
blades flat...... 27. P. saxatilis. 
w 
multnomae. 
1. Foa annua L. Sp. Pl. 1: 68. 1753. 
Type Locatity: “Habitat in Europa ad vias.”’ 
SPECIMENS EXAMINED: Near Ellensburg, Piper 2617; Vasey 181; North Yakima, Watt, 
August, 1895; Southbend, Spillman, August 17, 1899; Steptoe, Vasey 1; Pullman, Piper 
2769. 
Abundantly introduced, but in some localities apparently native. 
2. Poa compressa L. Sp. Pl. 1: 69. 1753. CANADA BLUEGRASS. 
TYPE Loca.ity: “Habitat in Europae et Americae septentrionalis siccis, muris, tectis.”’ 
