GLYCERIA. 403 



in flower otherwise close, spikelets ovate or oblong-ovate of 

 5 7 obtuse slightly webbed fl., lower pale 3-veined, veins hairy, 

 upper sheath about as long as its leaf, uppermost knot at about 

 the middle of the stem, ligule short truncate. E. B. 365. P. 37. 

 St. decumbent at the base, then erect, very much compressed, 

 1 H ft. high. /3. subcompressa (Parn.) ; lower pale with 2 

 faint intermediate veins. P. 90. Dry situations. P. VII. 



13. P. polynoda (Parn.) ; pan. erect ovate-lanceolate, spike- 

 lets ovate or ovate-lanceolate of 4 or 5 not webbed fl., lower pale 

 5-veined but only 3 hairy, upper sheath not longer than its leaf, 

 uppermost knot above the middle of the stem, ligule prominent 

 obtuse. P. 91. St. decumbent at the base, then erect, com- 

 pressed, 1 H ft. high ; knots 7 or 8, the second at about the 

 middle of the stem. L. acute. Pan. with short branches. Lowest 

 fl. not longer than the large glume. j3. denticulata (Para.) ; 

 midrib of lower pale not hairy but denticulate throughout, ligule 

 shorter, often one convolute hair at the base of the fl. P. 92. 

 Dry stony places. P. VI. VII. E. S. 



36. GLYCERIA R. Br. 



1. G. aquatica (Sm.) ; pan. erect repeatedly branched spread- 

 ing, branches scabrous, spikelets linear oblong of 5 10 fl., 

 lower pale obtuse, 1. smooth with terete sheaths. E. B. 1315. 

 P. 44. Creeping. St. 3 6 feet high, smooth, slightly com- 

 pressed. Sheaths very long. L. long, rough on the edges and 

 keel, never floating. Ligule short. Pan. large ; branches an- 

 gular, slender, branched. Watery places. P. VII. 



2. G.fluitans (R. Br.); pan. secund slightly branched very 

 long, branches nearly simple roughish, spikelets linear of 7 12 

 adpressed lanceolate-oblong acute fl., outer pale nearly thrice as 

 long as broad, sheaths compressed. P. 95. St. ascending, root- 

 ing below, or floating. Sheaths nearly smooth, striate. L. pale 

 green, acute, often floating. Ligule long. Pan. very long, often 

 nearly simple ; branches without callosities, ascending, lower- 

 most usually in pairs. Spikelets adpressed. Lower pale rather 

 the shorter, with a triangular central point. Anthers about Jive 

 times as long as broad, purple, pale yellow when empty. Watery 

 places. P. VI. IX. Flote-grass. 



3. G. plicata (Fries) ; pan. compound, branches compound 

 nearly smooth erect with flowers divaricate with fruit, spikelets 

 linear of 7 20 oval-oblong rather acute fl., lower pale twice as 

 long as broad, sheaths compressed. R. vii. 79. G.fluitans Sm., 

 E. B. 1520. P. 45. St. ascending, rooting below. Sheaths 

 rough, furrowed. L. glaucous, bluntish, plicate when young. 

 Ligule shorter. Pan. much branched; branches with callosi- 



