166 TWELFTH ANNUAL REPORT. 



DIARRHENA, Raf. Diakrhena. 



D. Aniericaua, Beauv. Diarrhena. 

 Sherburne county, I7p?iam. Rare. South. 



DACTYLIS, L. Orchard Grass. 



D. (/lomerata, L. Orchard Grass. 



Ramsey county, OesUund; Minneapolis, Simmons; Mankato, LeWerg. 



KCEIiERIA, Pers. Kosleria. 



K. cristata, Pers. Kceleria. 



Common, or frequent, throughout the state. [The most plentiful species of grass on 

 the line of the Northern Pacific railroad in western Dakota, Leibej-g.] 



EATONIA, Raf. Eatonia. 



E. obtusata, Gray. Eatonia. 



Minneapolis, Upham; Blue Earth county, Leiherg. [Manitoba, Macnun.'\ South 

 and west. 



E. Peunsylvanica, Giay. Eatonia. 



Throughout the state, excepting perhaps northwestward. Ramsey county, Uestlund; 

 Minneapolis, Upham; Blue Earth county, Leiberg; New Ulm, Juni. [^orth of lake 

 Superior, Agassiz.] 



GLYCERIA, R. Br. Manna-Grass. 



G. Canadensis, Trin. Rattlesnake-Grass. 



Frequent throughout the state, excepting far southward. St. Croix river, Parry; 

 Ramsey connty, Oestlund; Minneapolis, Simmons, Kassube. 



G. elOMgata, Trin. Manna-Grass. 



Minneapolis, Upham; Blue Earth county, Leiberg. Infrequent. 



G. nervata, Trm. Fowl Meadow-Grass. 

 Common throughout the state. 

 [G. pallida, Trin., doubtless occurs in this state, but has been overlooked.] 



G. aquatica, Smith, var. Americana, Vasey. Reed Meadow-Grass. 

 Common throughout the state. 



Spikelets erect, % to % of an inch long, scattered or subfascicled, sessile or pedicellate, 

 generally 4-flowered. Glumes unequal, convex, rounded at the back, not keeled, the 

 outer one shorter than the florets, acute, entire at the point, the middle nerve reaching 

 beyond the point, so as to form a short arista ; there are besides, on each side, two short 

 lateral nerves ; the inner glume as long as the whole spikelet of florets, torn at the 

 point, aristate, the middle nerve reaching beyond the point ; there are besides 2 

 lateral nerves reaching to the apex, and 2 intermediate shorter ones. Florets cylin- 

 drical, closely placed, with a tuft of white hairs at the base of each ; outer valve [palet] 

 of the perianth jagged at the point, shortly aristate, with 7 nerves reaching to the sum- 

 mit ; the Inner lanceolate, the margin inflected, with 2 strong, green, ciliated nerves 

 at the flexures, running out so as to form a bifld apex; upper floret smaller than the rest. 



Hooker's Flora Borealis Am., II, 251. The Iowa specimens, comnninicated by Mr. R- 



I. Cratty, agree fully with this description, except that the spikelets are not so large, 

 scarcely exceeding % of an inch in length. Pedicels of the spikelets rough; awns formed 

 by the nerves, especially of the glumes, inconspicuous, and sometimes barely observ- 

 able. It grows 3 to 5 feet high in water, at the margin of lakes. Arthur in Contribu- 

 tions to the Flora of Iowa, No. VI. 



