GRASS FAMILY 



201 



8. Poa confinis X'asey. 

 Dune Bluegrass. Fig. 460. 



Poa confinis Vasey, U. S. Dept. Agr. Div. Bot. Bull. 13-: 

 pi. 75. 1893. 



Perennial, from creeping rhizomes; culms low. 

 often geniculate or ascending at base, usually less 

 than 15 cm. tall; sheaths and the numerous involute 

 blades smooth ; panicle narrow, contracted, 1-3 cm. 

 long, tawny ; spikelets about 4 mm. long ; glumes 

 unequal, the second 3 mm. long; lemmas 3 mm. long, 

 scaberulous, sparsely webbed at base, the nerves 

 faint. 



Sand dunes and sandy meadows near the coast, southern 

 Alaska to Mendocino County, California. June-July. Type 

 locality: Tillamook Bay, Oregon. 



Fig. 



461. 



9. Poa piperi Hitchc. n. sp. Piper's Bluegrass. 



Perennial, pale green; culms loosely tufted with 

 numerous innovations, from slender creeping rhi- 

 zomes, smooth, terete, 40-60 cm. tall; sheaths of the 

 culm smooth, of the innovations pubescent or pu- 

 berulous, especially around the throat, becoming 

 glabrous: ligule of the upper culm leaf about 1.5 mm. 

 long, scabrous, of the innovation leaves very short. 

 less than 0.5 mm. ; blades narrow, involute, the 

 inargins meeting, pubescent on the upper surface, 

 glabrous beneath, rather strongly nerved, those of 

 the culm about 2, the upper at about the middle, 

 2-4 cm. long, those of the innovations 10-15 cm. 

 long, firm and rather stiff; panicle open, 5-8 cm. 

 long, the lower branches mostly in twos, ascending, 

 2-2) cin. long ; spikelets 3-5-fiowered, about 1 cm. 

 long ; glumes about 5 mm. long, indistinctly 3- 

 nerved, the first a little narrower than the second; 

 lemmas keeled, acute, about 5 mm. long. 5-nerved, 

 the intermediate nerves distinct, glabrous on the 

 back, minutely scabrous on the lateral nerves and on 

 the upper part of the midnerve. the tuft of cobwebby 

 hairs at base copious; palea a little shorter than the 

 lemma, strongly ciliate on the nerves. 



"Mountains 8 miles southwest of Waldo, Oregon, on dry mountain side under yellow pine, June \\ 

 1904." Collected by C. V. Piper (no. 6496). Only known from the type collection. 



y 



\ WW A m. 



10. Poa atropurpurea Scribn. 

 San Bernardino Bluegrass. Fig. 462. 



Poa atiopiii(>iirca Scribn. U. S. Dept. Agr. Div. Agrost. 

 Bull. 11: 53. pi. 10. 1898. 



Perennial, from creeping rhizomes ; culms 30-40 

 cm. tall, slender; sheaths smooth; blades mostly \ 

 basal, folded or involute, firm, smooth on under 

 surface, the uppermost culm-leaf below the middle; 

 panicle narrow, contracted, almost spike-like, purple- 

 tinged, 3-5 cm. long : spikelets 3-4 mm. long, turgid ; 

 glumes broad, less than 2 mm. long ; lemmas a 

 little over 2 mm. long, broad, smooth, not webbed, 

 the nerves faint. 



Only known from the San Bernardino Mountains 

 (Parish). 



