POACEAE 



4. Stipa occidentalis Thurb. 

 Western Stipa. Fig. 277. 



Stipa occidentalis Thurb.; S. Wats, in King, Geol. Expl. 

 40th Par. 5: 380. 1871. 



Stipa striata Vasey, Bull. Torrey Club 10: 42. 1883. 



Stipa stricta sparsiflora Vasey, Contr. U. S. Nat. Herb. 3: 



51. 1892. 

 Stipa oregonensis Scribn. U. S. Dept. Agr. Div. Agrost. 



Bull. 17: 130. /. 426. 1899. 

 Stipa occidentalis montana Merr. & Davy, Univ. Calif. 



Publ. Bot. 1: 62. 1902. 



Culms slender, cespitose, 30-60 cm. tall ; sheaths 

 smooth ; ligule 1 mm. long ; blades narrow, invo- 

 lute ; panicle narrow, 10-20 cm. long; glumes 8-10 

 mm. long, acuminate, 3-nerved, smooth ; lemma 6 

 mm. long, long-pilose, the callus sharp ; awn aboiU 

 2.5 cm. long, twice-geniculate, pilose to the second 

 bend or throughout, the first section 6-8 mm. long. 



Open dry woods, Canadian Zone; Washington to ( ali 

 fornia and' Wyoming. June-Aug. Type locality: Yo- 

 Semite Trail, California. 



5. Stipa Californica Merr. & Davy. 

 California Stipa. Fig. 278. 



Stipa californica INIerr. S: Davy, Univ. Calif. Publ. Bot. 1: 



61. 1902. 



Culms 60-150 cm. tall, smooth, or the nodes pu- 

 bescent; sheaths smooth, villous at the throat; ligule 

 very short ; blades flat, becoming involute, especially 

 at the long slender point ; panicle narrow ; usually 

 30-40 cm. long; branches fascicled, short, appressed, 

 or some of the lower as much as 12 cm. long ; glumes 

 thin and papery, equal, about 10 mm. long, smooth, 

 3-nerved, the lateral nerves rather indistinct ; lemma 

 about 6 mm. long, appressed-villous ; awn twice- 

 geniculate, the first section 6-10 mm. long, closely 

 twisted, villous, the second section shorter, 4-6 mm. 

 long, twisted, villous, the third section 10-16 mm. 

 long, straight, scabrous only and lighter in color. 



Meadows and open woods, Canadian Zone; Oregon south- 

 ward through the Sierra Nevada Mountains to the San Jacinto 

 Mountains. June-Aug. Type locality: San Jacinto Moun- 

 tains. 



6. Stipa coronata Thurb. 

 Giant Stipa. Fig. 279. 



Stipa coi-ouata Thurb. in S. Wats. Bot. Calif. 2: 287. 1880. 



Culms stout, 1-2 meters tall, as much as 6 mm. 

 thick at base, smooth or pubescent below the nodes ; 

 sheaths smooth, the margin and throat villous; ligule 

 about 2 mm. long, ciliate-margined ; blades very long, 

 flat, with a slender involute point ; panicle narrow, 

 dense, stout, purplish, 30-40 cm. long; glumes grad- 

 ually acuminate, 3-nerved, smooth except the scabrous 

 keel of the first, unequal, the first about 2 cm. long, 

 the second 2-4 mm. shorter ; lemma about 8 mm. 

 long, densely villous with long appressed hairs; awn 

 twice-geniculate, the first section about 10 mm. long, 

 twisted, scabrous but not villous, the second section 

 similar but shorter, the third section about as long as 

 the other two, straight. 



Open ground. Arid Transition Zone of Coast Ranges; 

 Monterey and southward into Lower California. Apr. -June. 

 Type locality: southern California. 



