606 Rydberg : Rocky Mountain flora 



^Poa subpurpurea Rydb. nom. nov. 



Poa purpurascens Vasey, Bot. Gaz. 6: 297. 188 1. Not P, pitr- 

 purascens Sprengel. 1 8 1 9. 



Poa tricholepis Rydb. sp. nov. ^ 



Perennial with a creeping rootstock and extravaginal innova- 

 tions ; sheaths of the basal leaves short, 2-4 cm. long, strongly 

 striate, rather loose, minutely retrorse-striate ; blades 5-10 cm, 

 long, a little over i mm. wide, scabrous ; sheaths of culm-leaves 

 7-12 cm. long; blades 2-6 cm. long, sometimes nearly 2 mm. 

 wide; Hgules lanceolate, acuminate, about 4mm. long; culm 

 slender, 3-5 dm. high ; panicle 6-8 cm. long, open, its branches 

 in pairs, 2-3 cm. long; spikelets 3-4-flovvered, 5-8 mm. long; 

 empty glumes about 4 mm. long, lanceolate in side view, acute, 

 green and purple towards the apex ; flowering glumes about 4 

 mm. long, villous below, strigose above, green, bordered with 

 purple and a scarious border, obtuse. 



This is related to P. Whecleri and P, Vaseyana, but is easily 



distinguished from both by the obtuse flowering glume, which is 



villous below. In the two species mentioned the flowering glume 



is very acute and strigulose or scabrous throughout, or in P. 



Vaseyana hairy on the nerves only. 



Colorado: Near Pagosa Peak, Aug. 1899, ^- ^- Baker 210. 



^ Poa nematophylla Rydb. sp. nov. 



A cespitose bunch-grass; basal leaf-blades short, striate, min- 

 utely retrosely strigulose ; stipules lanceolate, acuminate, about 3 

 mm. long; blades 1-1.5 dm. long, filiform, strongly involute, less 

 than 0.5 mm. wide, scabrous-strigulose ; culm-leaves few, near the 

 base ; sheaths 4-6 cm. long ; blades 3-5 cm. long ; culm about 3 

 dm. high, filiform; inflorescence narrow, raceme-like, 2-5 cm. long ; 

 branches 2-10 mm. long, bearing often only a single spikelet ; 

 spikelets 7-9 mm. long, about 4-flowered ; empty glumes about 

 4 mm, long, lanceolate, glabrous and shining; flowering glumes 

 about 6 mm. long, light-green, with a silvery scarious margin, very 

 acute, strigose below, scabrous-strigulose above. 



Related to Poa idahoensis^ but distinguished by the narrow in- 

 florescence and {^w racemosely disposed spikelets. 



Colorado : Meeker, Rio Blanco County, June 8, 1902, G. E. 

 OstcrJioiit 2601. 



