578 



GRAMfNEiE 



38. Glyceria (Manna-grass.)— Tall, semi-aquatic, perennial 

 grasses, with unsplit leaf-sheaths; spikelets panicled, awnless, 

 many-flowered; glumes unequal, membranous, obtuse; flowering 

 glume sub-cylindric, 3 — 9-ribbed, obtuse. (Name from the Greek 

 glukeroSj sweet, in allusion to the sweetness of the grain.) 



GLYCERIA FLUITANS 



{^Flote-grass, Manna-croup). 



GLYCERIA AQuAtICA 

 {Reed Manna-grass). 



I. G. fluitans (Flote-grass, Manna-croup). — Root-stock creeping; 

 stem I — 3 feet, thick, but weak, smooth, floating, or creeping; 

 leaves often floating, flat, acute, with long, compressed, striate 

 sheaths ; panicle slender, about a foot long, slightly branched, 

 branches erect in fruit ; spikelets few, linear, adpressed, \ — 2 in. 

 long, 7 — 20-flowered ; flowering glume nearly thrice as long as 



