132 



POACEAE 



10. Stipa lepida Hitchc. 



Small-flowered Stipa. 



Fig-. 283. 



Stipa lepida Hitchc. Am. Journ. Bot. 2: 303. 1915. 

 Stipa eminens of Californian botanies, not Cav. 



Culms slender, puberulent below the nodes, 60-100 

 cm. tall ; sheaths smooth, sparingly villous at throat ; 

 ligule very short ; blades flat, narrow, 2-4 mm. wide, 

 pubescent on upper surface near base ; panicle rather 

 loose and open, usually 15-20 cm. long, but some- 

 times more than 30 cm. long, the branches distant, 

 slender ; glumes 3-nerved, smooth, unequal, acumi- 

 nate, the first 6-10 mm. long, the second about 2 mm. 

 shorter; lemma about 6 mm. long, sparingly villous, 

 nearly glabrous toward the hairy-tufted apex ; awn 

 indistinctly twice-geniculate, about 2.5-4 cm. long, 

 scabrous but not villous. 



Open ground. Arid Transition Zone; Coast Ranges from 

 central California to Lower California. Apr. -June. Type 

 locality: Santa Ynez Forest Reserve. 



Stipa lepida andersoni (Vasey) Hitchc. Am. Journ. Bot. 

 2: 303. 1915. Stipa eminens andersoni Vasey, Contr. U. S. 

 Nat. Herb. 3: 54. 1892. Differs from the typical form 

 chiefly in the slender involute blades. This form is, on the 

 average, a smaller plant, the culms being shorter, the panicles 

 narrower and few-flowered, the spikelets usually smaller. 



Range about the same as for S. lepida but extending 

 north to Mount Shasta (Jepson). Type locality: Santa Cruz. 



11. Stipa williamsii Scribn. 

 Williams's Stipa. Fig-. 284. 



Dept. Agr. Div. Agrost. 



Stipa zvilliainsii Scribn. U. S 

 Bull. 11: 45. pi. 4. 1898. 



Culms erect, 60-100 cm. tall ; puberulent, espe- 

 cially around the nodes ; sheaths puberulent ; 

 ligule very short ; blades more or less puberulent. 

 1-3 mm. wide; panicle narrow, 15-20 cm. long, 

 the branches appressed ; glumes thin, nearly 

 equal, about 1 cm. long ; lemma about 7 mm. long, 

 the awn 3 cm. long. 



Open ground, Arid Transition Zone; eastern Wash- 

 ington and eastern Oregon to Wyoming. May-Aug. 

 Type locality: Wyoming. 



12. Stipa stillmanii Boland. 

 Stillman's Stipa. Fig. 285. 



Stipa stillmanii Boland. Proc. Calif. Acad. 4: 169. 1872. 



Culms stout, 60-100 cm. tall ; sheaths smooth, 

 puberulent at the throat and collar ; ligule very 

 short; blades scattered, folded or involute, firm, the 

 uppermost filiform; panicle narrow, dense or inter- 

 rupted at base, the branches short, fascicled ; glumes 

 equal, papery, minutely scabrous, acuminate into a 

 scabrous awn-point, 14—16 mm. long, the first 3- 

 nerved, the second 5-nerved ; lemma 9 mm. long, 

 short-pilose, bearing 2 slender teeth afthe apex, the 

 callus short ; awn about 2.5 cm. long, once- or in- 

 distinctly twice-geniculate, scabrous. 



Only known from the type collection by Bolander (Blue 

 Caiion, Placer County, California). 



