MANUAL OF THE GRASSES OF THE UNITED STATES 



449 



base, the branches short, fascicled; 

 glumes equal, 14 to 16 mm. long, 

 papery, minutely scabrous, acuminate 

 into a scabrous awn-point, the first 

 3-nerved, the second 5-nerved ; lemma 

 9 mm. long, short-pilose, bearing 2 

 slender teeth at the apex, the callus 

 short; awn about 2.5 cm. long, once- 

 or indistinctly twice-geniculate, sca- 

 brous. % — Rocky slopes, Sierra 

 Nevada, from Lassen National Forest 

 to Tahoe National Forest, Calif.; 

 apparently rare. 



5. Stipa coronata Thurb. (Fig. 

 642.) Culms stout, 1 to 2 m. tall, as 

 much as 6 mm. thick at base, smooth 

 or pubescent below the nodes ; sheaths 

 smooth, the margin and throat vil- 

 lous; ligule about 2 mm. long, ciliate; 

 blades elongate, 4 to 6 mm. wide, flat 

 to subinvolute with a slender involute 

 point; panicle 30 to 40 cm. long, con- 

 tracted, erect, purplish; glumes grad- 

 ually acuminate, 3-nerved, the first 

 about 2 cm. long, the second 2 to 4 

 mm. shorter; lemma about 8 mm. 

 long, densely villous with long ap- 

 pressed hairs 3 to 4 mm. long; awn 

 usually 4 to 5 cm. long, scabrous, 

 twice-geniculate, the first and second 

 segments about 1 cm. long. % — 

 Open ground in the Coast Range, 

 California, from Monterey to Baja 

 California; Grand Canyon, Ariz. 



Stipa coronata var. depauperata 

 (Jones) Hitchc. Culms usually 30 to 

 50 cm. tall; blades 10 to 20 cm. long; 

 panicle 10 to 15 cm. long, rather few- 



flowered, the spikelets commonly 

 smaller than in the species, the lemma 

 6 to 7 mm. long, the awn about 2.5 

 cm. long, once-geniculate, the first 

 segment twisted and scabrous-pubes- 

 cent, about 1 cm. long, the second 

 segment bent about horizontally. 

 % — Dry or rocky slopes, Utah and 

 Nevada to Arizona and southern 

 California. Many intermediates occur 

 between the variety and the species. 

 6. Stipa richardsoni Link. Rich- 

 ardson NEEDLEGRASS. (Fig. 643.) 



Culms 50 to 100 cm. tall; blades 

 mostly basal, usually 15 to 25 cm. 

 long, involute, subfiliform, scabrous; 

 panicle 10 to 20 cm. long, open, the 



Figure 642. — Stipa coronata. Floret, X 1; lemma 

 X 5. (Orcutt 1068, Calif.) 



Figure 643.— Stipa richardsoni. Panicle, X %', floret, X 1; lemma, X 5. (Hitchcock 11468, Alberta.) 



