'^^'^ I'OACE.K. 



liumiHpluM-e. also ivpivHuntcd outsi.l,. tlio in.j)i,.s in the 8(.iitli(.ni 

 licinispliore. I). civ.s2,il„m niiigcs ..mt the entire urea hIjovo 

 specilicd. 



Des.'liunipsiu l.cars the sanu- ivliitioii lo Mra flint ('nhn,„i;iruslis 

 does to J^mv//,v; phirits usually piTonnial and stoulcr lliau .l/w. 

 spikolets lon^^er, radiilja produced beyond the iipp..r llorct int.. a 

 briHtl.. or sonu'tinics an empty n.],,,,,,, or even u ataniinate lloucr; 

 floral .rliinu" ol'te.i more or less denticulate. Six of the species Imvc 

 been proposed as .listinct ^n-uera. The above comments concern- 

 ing the position of the genus are niaiidy the views of Hentham. 



A. First emi)ty glume 1 -nerved a^\ 



a. Florets overlappin.y-. about four-firths of their length, (b) 

 b. Awn straight, short, a dwarf arctic grass. . . . 1 

 b. Awn bent, protruding, jjaniclo spikelike. ... 3 



b. Awn bent, protruding, panicle thin, spreading. . 3 

 a. Florets overlapping (me-third to half of their length, (c) 



e. Empty glunuw extending above the florets, uwn 



near or above the middle of the glume (d) 



d. IMades flat, 3-G mm. wide 4 



d. liladcs 3-4 mm. wide, involute, floret conspicu- 

 ously hairy g 



c. Empty glumes usually not extending to the tip of 

 the upper floret /p\ 



e. Awn twisted, starting below the middle of its 



glume Q 



e. Aavii straigli t, starting at the middle of its glume. 7 



B. First empty glume 3-nerved /],n 



h. Emi)ty glumes 5-r mm. long § 



h. Empty glumes ,3-4 mm. long n\ 



i. IJays of panicle mostly in twos 9 



i. Eays of i)anicle mostly in threes 10 



1. D. brevifoliaK. l?r., Parry's Voy. Suppl. 191 (1823). Aim 

 arctica Spreng. Syst. 2:33 (1835.) 



A smooth perennial, 6-30 cm. higli. Lignle oblong; blades of 

 sterile shoots 6-13 cm. long, those of the cuim 1-3 cm. long, 2-3 

 mm. wide, involute, reaching nearly to the panicle. Panicle 



