PIPER FLORA OF THE STATE OF WASHINGTON. 106 



SITANION. 



Glumes cleft or parted into 3 to many lolx's; awns of Icmiuas S to 



10 cm. long.. 1. jS'. juJititinn. 



(rlumes entire or only 2-cleft or 'i-paited. 

 Nerves of the glumes two. 



Glumes entire; lemma glaucous, 1 cm. long 2. S. hrevij'olinm. 



Glumes or some of them l)iH(l or 2-parted. 



Sheaths and upper surface of leaves glahrous. 



Leaves strongly involute 0. S. hasallicohi. 



Leaves flat or tardily involute. 



Blades 5 to 7 mm. broad .5. iS'. l<ttlfolium. 



Blades 2 to 5 mm. broad. 



Low plants; awnsof lemmas.^ t()4 cm. long. 3. S. ru/uhnn. 

 Taller; awns of lemmas 4 to 5 cm. long. . . 4. S. (jJnhrinn. 

 Sheaths and upper surface of leaves puiiescent. 



Awns 2 to 3 times as long as lemma 7. <S'. ciliafiiin. 



Awns 4 to 5 times as long as lemma. 



Innovations many; culm leaves 7 to 12 cm. long. S. S. liyt^frtJ'. 

 Innovations few; culm leaves 2 to G cm. long. . 9. (V. rdutinuni. 

 Nerves of the glumes 3 to 5. 



Leaves glaucous, 5 to 8 mm. broad 10. S. planifoliuni. 



Leaves green, 2 to 5 nun. broad 11. <S'. ruhescens. 



1. Sitanion jubatum J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 10. 1S90. 

 Sitanion villosum J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 11 1S99. 

 Sitanion stricium Elmer, Bot. Gaz. 36: 59. 1!X)3. 



Type locality: "Waitsburg, Wash." Collected by Horner. 



Eange: Washington to California. 



Specimens examined: Waitsburg, Horner 249, 573; Wawawai, Piper 2998; Pullman, 

 Piper 3021; W^alla Walla, Shear 1602; Griffiths <& Cotton 554; Waitsburg, Horner 574; 

 Spokane, Piper 2598; Pullman, Piper, July 28, 1899; Wawawai, Piper 3528, 3958, 3970, 

 3529; Chirks Springs, Kreager 99; Almota, Elmer 26(3. 



Zonal distribution: Upper Sonoran and Arid Transition. 



2. Sitanion brevifolium J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 17. 1899. 

 Type locality: Tucson, yVrizona. 



Range: W^ashington to Colorado and Arizona. 



Specimens examined: Falcon Valley, Suhsdorf ^19?,, July 16, P)05. 



3. Sitanion rigidum J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 13. 1899. 

 Type locality: "Cascade Mountains, Washington." Collected by Allen. 

 Range: Washington to California and Wyoming. 



Specimens examined: Olympic Mountains, Flett 119, 832; Goat Mountains, Alleri 178; 

 Mount vStuart, Elmer 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 locality: "Near Crystal Spring, Caso Mountains, California." 



Range: Washington to California. 



Specimens e.xamined: Olympic Mountains, Elmer 1904; Mount Rainier, Piper 1952; 

 Mount Adams, Henderson, August, 1892; head of Twenty-five-mile Creek, Gorman 824. 

 Zonal distribution; Arctic. 



