PIPER—FLORA OF THE STATE OF WASHINGTON. 153 
SITANION. 
Glumes cleft or parted into 3 to many lobes; awns of lemmas 8 to 
10cm. long.......-...-------- 22-22-2222 2 ee ee ee ee eee ee 1. S. jubatum. 
Glumes entire or only 2-cleft or 2-parted. 
Nerves of the glumes two. 
Glumes entire; lemma glaucous, 1 cm. long.............-- 2. S. brevifolium. 
Glumes or some of them bifid or 2-parted. 
Sheaths and upper surface of leaves glabrous. 
Leaves strongly involute.....-...-.-.---.-----.. 6. S. basalticola. 
Leaves flat or tardily involute. 
Blades 5 to 7 mm. broad_._....-.........-.. 5. S. latifolium. 
Blades 2 to 5 mm. broad. 
Low plants; awns of lemmas3to4em.long. 3. S. rigidum. 
Taller; awns of lemmas 4 to 5 em. long... 4. S. glabrum. 
Sheaths and upper surface of leaves pubescent. 
Awns 2 to 3 times as long as lemma... ..-..-.----- 7. S. ciliatum. 
Awns 4 to 5 times as long as lemma. 
Innovations many; culm leaves7 tol12cm.long. 8. S. Aystrizx. 
Innovations few; culm leaves 2 to6 cm. long... 9. S. velutinum. 
Nerves of the glumes 3 to 5, 
Leaves glaucous, 5 to8 mm. broad__.._.........-.------- 10. S. planifolium. 
Leaves green, 2 to 5 mm. broad.............-...-.------- 11. S. rubescens. 
1. Sitanion jubatum J. G. Smith, U.S. Dept. Agr. Div. Agrost. Bull. 18: 10. 1899. 
Sitanion villosum J.G, Smith, U.S. Dept. Agr. Div. Agrost. Bull. 18: 11. 1899. 
Sitanion strictum Elmer, Bot. Gaz. 36: 59. 1903. 
Tyre Locauity: “ Waitsburg, Wash.’ Collected by Horner. 
Rance: Washington to California. 
SPECIMENS EXAMINED: Waitsburg, Horner 249, 573; Wawawai, Piper 2998; Pullman, 
Piper 3021; Walla Walla, Shear 1602; Griffiths & Cotton 554; Waitsburg, Horner 574; 
Spokane, Piper 2598; Pullman, Piper, July 28, 1899; Wawawai, Piper 3528, 3958, 3970, 
3529; Clarks Springs, Kreager 99; Almota, Elmer 266. 
ZONAL DISTRIBUTION: Upper Sonoran and «Arid Transition. 
2. Sitanion brevifolium J.G. Smith, U.S. Dept. Agr. Div. Agrost. Bull, 18: 17. 1899. 
Type Locauiry: Tucson, Arizona. 
Rance: Washington to Colorado and Arizona. 
SPECIMENS EXAMINED: Falcon Valley, Suksdorf 5193, July 16, 1905. 
3. Sitanion rigidum J. G. Smith, U.S. Dept. Agr. Div. Agrost. Bull. 18: 13. 1899. 
Type Locaity: ‘Cascade Mountains, Washington.’’ Collected by Allen. 
Rance: Washington to California and Wyoming. 
SPECIMENS EXAMINED: Olympic Mountains, Flett 119, 832; Goat Mountains, Allen 178; 
Mount Stuart, Hlmer 1145; Mount Chapaca, Elmer, August, 1897; Blue Mountains, Horner 
579; without locality, Vasey 454. 
ZONAL DISTRIBUTION: Arctic. 
4. Sitanion glabrum J. G. Smith, U.S. Dept. Agr. Div. Agrost. Bull. 18: 14. 1899. 
TYPE Locauity: ‘‘ Near Crystal Spring, Caso Mountains, California.” 
Rance: Washington to California. 
SPECIMENS EXAMINED: Olympic Mountains, Elmer 1904; Mount Rainier, Piper 1952; 
Mount Adams, Henderson, August, 1892; head of Twenty-five-mile Creek, Gorman 824 
ZONAL DISTRIBUTION: Arctic. 
