254 



POACEAE 



3. Sitanion jubatum J. G. Smith. 

 Big- Squirrel-tail. Fig. 605. 



Polyanthrix hystrix Nees, Ann. Nat. Hist. 1: 2S4. 1838, 



not Sitanion hystrix J. G. Smith. 

 Sitanion jubatum' J. G. Smith, U. S. Dept. Agr. Div. 



Agi-ost. Bull. 18: 10. 1899. 

 Sitanion villosum J. G. Smith, U. S. Dept. Agr. Div. 



Agrost. Bull. 18: U. pi. 1- 1899. 

 Sitanion multisetiim J. G. Smith, U. S. Dept. Agr. Div. 



Agrost. Bull. 18: 11. 1899. 

 Sitanion polyanthrix T. G. Smith, U. S. Dept. Agr. Div. 



Agrost. Bull. 18: 12. 1899. 

 Sita)iion brcz'iaristatnni J. G. Smith, U. S. Dept. Agr. Div. 



Agrost. Bull. 18: 12. 1899. 

 Sitanion strictum Elmer, Bot. Gaz. 36: 59. 1903. 



Culms erect, 30-60 cm. tall, rareh* taller ; sheaths 

 smooth, scabrous or villous-pubescent ; blades flat, 

 often becoming involute, smooth or usually more or 

 less pubescent, at least on upper surface, usually not 

 over 3 mm. wide ; spike erect, dense, 2i-7 cm. long, 

 thick and bushy from the numerous long awns ; 

 glumes split into 2 or usually 3 or more lobes or 

 divisions, each extending into a long awn-; lemmas 

 mostly 8-10 mm. long, smooth, or scabrous toward 

 apex, the awns and those of the glumes 3-10 cm. 

 long, rarely shorter. 



Rocky or brushy hillsides and open dry woods and plains, in the Arid Transition and Upper Sonoran 

 Zones; eastern Washington to southern California, east to Idaho. May-July. Type locality: Waitsburg, 

 Washington. 



4. Sitanion hystrix (Nutt.) J. G. Smith. 

 Bottle-brush Squirrel-tail. Fig. 606. 



Aegilops hystrix Nutt. Gen. PI. 1: 86. 1818. 

 Sitanion elymoidcs Raf. Journ. de Phys. 89: 103. 1819. 

 t.l\mus elymoides Swezey, Nebr. Fl. PI. 15. 1891. 

 Sitanion minus J. G. Smith, U. S. Dept. Agr. Div. Agrost. 



Bull. 18: 12. 1899. 

 Sitanion rigidum J. G. Smith, U S. Dept. Agr. Div. Agrost. 



Bull. 18: 13. 1899. 

 Sitanion californicum J. G. Smith, U. S. Dept. Agr. Div. 



Agrost. Bull. 18: 13. 1899. 

 Sitanion glabrnm J. G. Smith, U. S. Dept. Agr. Div. Agrost. 



Bull. 18: 14. 1899. 

 Sitanion cinercum J. G. Smith, U. S. Dept. Agr. Div. Agrost. 



Bull. 18: 14. 1899. 

 Sitanion hystrix J. G. Smith, U. S. Dept. Agr. Div. Agrost. 



Bull. 18: 15. pi. 2. 1899. 

 Sitanion montannm J. G. Smith, U. S. Dept. Agr. Div. 



Agrost. Bull. 18: 16. 1899. 

 Sitanion strigosnm T. G. Smith, U. S. Dept. Agr. Div. Agrost. 



Bull. 18: 17. 1899. 

 Sitanion velutinum Piper, Bull. Torrey Club 30: 233. 1903. 

 Sitanion rigidum californicum Smilev, Univ. Cal. Publ. 9: 99. 



1921. 



Culms tufted erect and rather stiff, 10-50 cm. 

 tall; sheaths glabrous, puberulent or softly pubes- 

 cent ; blades flat or involute, glabrous or puberulent 

 below, usually puberulent above, sometimes softly 

 pubescent alf over, rather stiffly ascending or somewhat spreading. 5-20 cm. l_ong. or the 

 uppermost shorter, 1-3 mm. wide, rarely as much as 5 mm. wide ; spike erect, 2-7 cm., rarely 

 10 cm, long; glumes very narrow, almost subulate, 1-2-nerved, extending into a slender 

 scabrous awn, sometimes bifid at the middle, or bearing a bristle, or awn along one margin ; 

 lemmas convex, smooth or scabrous, sometimes glaucous, extending into a slender awn, the 

 awns of glumes and lemmas, 2-7 cm. long; rachis readily breaking up at maturity. \"ariable 

 in aspect, as to length of blades and awns, and as to amount of puliescence. At high altitudes 

 the plants are dwarf. 



Dry hills, plains, open woods, and rocky slopes from the Arid Transition to the Alpine Zone; eastern 

 Washington to southern California, east to' western Kansas. July-Aug. Tyi)e locality: arid plains of the 

 Missouri. 



78. HYSTRIX Moench, Meth. PI. 294. 1794. 

 [Gymnostichum Schreb. Beschr. Gras. 3: 127. pi. 47. 1810.] 

 Spikelets 2-4-flowered, sessile, 1-3 at each node of a continuous flattened rachis. hori- 

 zontally divergent at maturity; glumes reduced to short or minute awns, the first usually 

 obsolete, both often wanting in the upper spikelets; lem.mas convex, rigid, tapering into 

 long awns, 5-nerved, the nerves obscure except toward the tip ; palea about as long as the body 

 of the lemma. Erect perennials with flat blades and bristly loosely flowered spikes. [Greek, 

 porcupine.] 



.Species 4 in temperate regions. Type species, Elymiis hystrix L. 



