180 FLORA OF MOUNT DESERT. 



GLYCERIA, E. Br. MANNA GRASS. 

 G. Canadensis (Mx.), Trin. RATTLESNAKE GRASS. JOB'S TEARS. 



Common in wet places. 

 G. laxa, Scribner. 



A coarse leafy grass, 2-4 high, with a diffuse ample panicle 

 and oblong, somewhat turgid spikelets. Sheaths scabrous, the 

 lower exceeding the interuodes. Ligule about V long, thin, 

 lacerate. Leaves 8'-15' long, 3"-4" wide, very rough-scabrous, 

 both sides tapering to a sharp point or the lower ones abruptly 

 sharp-pointed. Panicle 7' 9' long, the main axis and branches 

 strongly scabrous, lower branches in twos or threes, the upper 

 solitary, the longer and usually widely spreading lower ones 

 3' -5' long. Spikelets oblong or broadly ovate, 3-5-flowered, 

 about 2" long, much exceeding the pedicels, and from l"-l" 

 wide. Empty glumes unequal, scarious-margined, the larger 

 second glume about one half the length of the first floret. 

 Flowering glumes rounded on the back, l"-l" long, broadly 

 obovate, obtuse, with a narrow scarious margin above, 7-nerved, 

 nerves not prominent. Palea nearly equalling the glume, the 

 keels smooth, strongly curved above. Closely allied to G. Cana- 

 densis, but the smaller spikelets are green or purple tinged, and 

 the more obtuse floral glume scarcely exceeds the narrower palea. 



F. Lamson-Scribner in Bull. Torr. Bot. Club, xxi. 37, sub nom. 

 JPanicularia laxa, and republished here as above at his desire. 

 Seal Harbor (Redfield) ; Somesville (Rand). A form appar- 

 ently of this species with smaller and imperfectly developed 

 spikelets, Great Cranberry Isle; Seal Harbor (Redfield). 



G. obtusa (Muhl.), Trin. 



Common in wet grounds about Somesville. Also Southwest 

 Harbor; Sea Wall (Rand). 



G. elongata (Torr.), Trin. 



Wet woods. Near Beech Hill (Arnold Greene) ; Canada 

 Valley; Seal Harbor; Beech Mt. Notch (Rand). 



G. nervata (Willd.), Trin. 

 Common in meadows. 



