AOROSTIDKvK • 277 



8i)ikelots that of Oryzeiv. It has by some been i)hiceil in the tribe 

 Orvzejv. 



There about '^0 species found in temperate and cold countries of 

 l)oth the Northern and the Southern Ilemispiiere. 



A. Spike 2 cm. h)n<^ or h'ss (a) 



a. Spike T-i:} mm. diam 1 



a. Spike 5 mm. diam 2 



B. Spike "^.5 cm. or more h>n_<r (b) 



b. Empty <;lunu'S not ciliate 3 



b. Empty jjlumes ciliate (c) 



c. Siieath much inlhited, enclosing the base of the 

 spike 4 



c. Sheath moderately or little inflated, mature spikes 



not included (d) 



d. Erect, spikes 4-8 mm. diam o-fi 



d. Erect, sj)ikes lO-I,") nim. diam 7 



d. Base procumbent, spikes about mm. diam. . S 



1. A. alpinus .1. E. Sm. Kngl. Hot. /. 1I-,MJ (ITD.-J). Alpixk 

 Foxtail. 



A rather stout perennial, procumbent at base, 10-50 cm. liigh. 

 Sheaths much inflated, longer than fhi' blades: ligulc 1 mm. long, 

 obtuse; blades flat. )}-() cm. long, 4-.") mm. wide. Spike 1--3 

 cm. long, 7-V> mm. diam., dense, branches with 4-() spikelets. 

 Emi)ty glumes slightly uiu'(pud. connate at l)ase, about 3 mm. long, 

 ovate, purplish, silky all over the outer side. 



Alaska, Miirdai'k-; Colorado, ('(issitlij. 



l?ocky Mountains. 



2. A. Howellii Vasey. Bull. Torr. Bot. Club, l.'):12r (IS88). 

 A. Mariiiuiii Vasey, Bull. Torr. Club, IT): U (ISHS). 



Annual: culms fi-fO cm. high, erect or geniculate. Ligule 2 

 mm. long; lower blades narrow, exceeding tlus culm, the upper 

 one short, those of the culm usually )*. the uj)per inllated. Spike 

 oval-oblong, \-l cm. long. 5 mm. diam., often partially included. 

 Empty glumes oblong, nearly 3 mm. long, obtuse, slightly united 

 below, sti'ongly ciliate on the keel; floral glume as long as the 

 empty glumes, smooth, obtuse, edges united to the middle or higher, 



