GLYCERIA.] GR AMINES. 445 



31. GLYCE'RIA, Br. MANNA GRASS. 

 Spikelets linear, subterete, in effuse or contracted panicles, rarely spiked, 



3-rnany-flowered, branches in 4-whorls. Empty glumes 2, shorter than the 



lowest flowering, 1-3-nerved, unequal, membranous, convex, awnless ; 



upper larger. Fl. glumes caducous, cartilaginous, convex, not keeled, tip 



obtuse usually scarious ; nerves 5-7, parallel. Palea 2-fid, nerves ciliate. 



Scales fleshy, truncate. Stamens 3. Ovary glabrous ; styles terminal, 



short or 0, stigmas feathery. Fruit oblong, free, channelled or not. 



DISTRIB. Temp, and cold climates; species 20.- ETYJI. yXvxfpos, in 



allusion to the sweet grain. 



SECTION!. Glyce'ria proper. Perennial. Leaves flat ; sheaths entire. 



Fl. glume strongly nerved. Hairs of stigma branched. Fruit grooved. 

 1. G. aquat'ica, 8m. ; panicle much branched, spikelets oblong, fl. 



glumes 5-9 entire. U. spcctabilis, Mert. and Koch. 



Watery places; fl. July- Aug. Rootstock stout, extensively creeping. Stem 

 2-6 ft., stout, smooth, striate. Leaves 1-2 ft., ^-^ in. broad, suberect, acute ; 

 sheaths smooth ; ligule short. Panicle 6-12 in. Spikelets in., yellow- 

 green and purple ; glumes scabrid ; empty short, shining ; flowering rigid, 

 obtuse; nerves strong. DISTRIB. Europe, Siberia, Himalaya, N. America. 

 '2. G. flu'itans,^?? 1 . ; panicle subsimple, spikelets linear, fl. glumes 720. 



Watery places ; ascending to 1,600 ft. in Yorkshire ; fl. July-Aug. Rootstock 

 stout, widely creeping. Stem 1-3 ft., stout, branched, terete, floating or 

 creeping, smooth. Leaves ^ in. broad, flat, acute, short, or the upper long 

 and floating ; sheaths long, compressed ; ligule broad, acute. Panicle 1-2 ft., 

 simple or branched ; rachis 3-gonous ; branches remote, smooth. Spike- 

 li:tn ;J-2 in., erect, green or tips purplish ; empty glumes unequal, tips torn ; 

 H. glumes scabrid, tips often ragged. DISTRIB. Europe, N. Africa, W. 

 Siberia, Himalaya, N. America. 



Sub-sp. FLU'ITANS "proper ; sheaths striate, branches of fruiting panicle erect, 

 tip of fl. glume subentire, anthers purple very narrow. 



Sub-sp. PLICA'TA, Fries (sp.) ; sheaths furrowed, branches of fruiting panicle 

 spreading, tip of fl. glume 3-toothed, anthers broader. G. pedicellata, Towns. 

 SECTION 2. SCLEROCIILO'A, fieauv. (gen. ). Leaves with split sheaths. 



Fl. r//>ime obscurely 5-nerved. Stigmas subsessile, hairs simple. Fruit 



obscurely grooved. 



* Empty glume* %-nerved (Atropis, Rupr.). 

 ?>. G. marit'ima, Wahlb. ; perennial, stolons long, leaves involute, 



ligule oblong, branches of panicle solitary or 2-3-nate, fl. glumes 4-12, 



tip subacute. 



Muddy, &c. sea-coasts ; fl. July. Rootatock widely creeping. Stems 8-16 in., 

 terete, smooth. Leaves involute or channelled, acute or pungent ; sheaths 

 smooth ; ligule rather long, oblong. Panicle 1-3 in., oblong, contracted ; 

 branches appressed or horizontal, rarely de flexed, or more than 3-nate ; 

 rachis subterete, grooved on one side. Spikelets %~^ in., ovate-oblong or 

 linear-elongate, green or purplish ; empty glumes subacute ; fl. glumes 

 obscurely 3-toothed, tip hyaline or not. DISTRIB. Europe, N. Africa, 

 Sibsria. X. America. 



