158 



GRAMINEAE ((iKASS 1-AMILY) 



16S. S. festucacea. 

 Panicle X y,o. 

 Spikelet and floret x 1, 



72. SCOLOCHLOA Link. 



Spikelets 8-4-flowered ; callus hairy ; glumes acute ; lem- 

 mas firm, convex below, the nerves unequal, one or more 

 excurrent as slender teeth ; palea as lonj; as its lemma or 

 longer, 2-toothed ; ovary hairy at the summit. — Tall peren- 

 nials with flat leaves and ample spreading panicles. (Name 

 probably from (tkQXos, a prickle, and x^oa, grass.) 



1. S. festucacea (NVilld.) Link. (Si'wanglk-top.) Culms 

 stout, erect, from tliick soft rootstocks, 1-2 m. high ; leaves 

 2-3 dm. long ; panicles 1.5-3.5 dm. long, the fascicled 

 branches spreading ; spikelets 6-12 mm. long ; glumes nearly 

 as long as the florets, 13-5-nerved. — Marshes and shallow 

 water, la., Minn., and northwestw. June, July. Fig. 168. 



73 GLYCERIA R. Br. Manna Grass 



Spikelets few-many-flowered, subterete or slightly compressed, in narrow 

 or spreading panicles ; glumes unequal, shorter than the florets ; lemmas convex, 

 firm, with a scarious margin or apex, and 5-9 strong parallel nerves; paleas 

 equaling or a little longer tliau their lemmas, the strong nerves nearly marginal. — 

 Usually tall aquatic perennials, with simple culms, often partially closed sheaths, 

 flat leaves and terminal panicles. (Name from yXvKepos, sweety in allusion to 

 the taste of the grain.) Fanicularia Fabricius. • 



• • 



Spikelets 2-7 mm. long-, ovate or oblong. 

 Panicle contracted, narrow. 



Panicle linear, l..>-.3 dm. long 



Panicle oblong, dense, 7-12 era. long 



Panicle oi)en, lax. 

 Siiikelets -S-i mm. wide ; lemmas obscurely nerved. 



Spikelets ovate, 5-10-liowered 



Spikelets oblong, .S-5-flowered 



Spikelets not over 2.5 mm. wide ; lemmas strongly nerved. 



Second glume 1 mm. long 



Second glume 2-2.5 mm. long. 



Panicles ample, many-flowered, 2 dm. or more long 

 Panicles narrow, few-flowered, rarely 1.5 dm. long 

 Spikelets 1-4 cm. long, compressed-cylindric. 

 Lemma obtuse ; palea about the same length. 



Lemma 6 mm. lor.g , 



Lemma 3-4.5 mm. long. 

 Spikelets L.'j-i cm. long, subsessile or nearly so . . . . 



Spikeiets 1-1.5 cm. long, on slender pedicels one third to two thirds 



as long 



Lemma acute, much exceeded by the palea 



1. O. Torreyana. 



2. G. obtusa^ 



3. G. canadensis. 



4. G. laxa. 



5. G. nevcata. 



6. G. grandis. 



7. G. pallida. 



8. G.fiuitans. 



9. G. septentrionalis. 



10. G. borealis. 



11. G. acntijlora. 



1. G. Torreyana (Spreng.) Hitchc. Culms solitary or few, erect from a 

 running rootstock, (i-O dm, high ; the smooth sheaths closed nearly to the sum- 

 mit ; blades 3 dm. or more long, 3-6 rtim. wide, scabrous; panicle linear, 1.5-3 

 dm. long, nodding at the summit; spikelets appressed, 3-4-flowered, about 4 mm. 

 long. ((t. elongata Trin.) — Wet woods. Que. to Minn, and Pa., and in the 

 mts. to N. (\ July, Aug. 



2. G. obtusa (Muhl.) Trin. Culms stout, erect, 3-12 dm. high ; shmlhs closed 

 about half their length, the lower overlapping; blades 2-5 dm. long, 4-8 mm. 

 vnde, smooth behtw, rough above ; panicle finally erserted, 

 oblong, dense, 6-18 C7>i. long; .spikelets 3-7-flowere(l. 5-6 mm. 

 long; the scarious apex of the lemma often revolute. — Bogs 

 and swampy places, N. B. to Pa., and southw. near the coast. 

 July, Aug. 



3. G. canadensis (Michx. ) Trin. Katti>esnake Grass. 

 Culms solitary or few, stout, erect, 6-10 dm. high ; sheaths over- 

 lapping below, compressinl ; blades 1.5-3.5 dm. long. 4-8 mm. 

 wide, scabrous; panicle 1.5-3 dm. Ioult, nearly ;is wide, vi^ry 101». <;. canadensis. 

 loose and open, the capillary remote branches drooping, naked spikeletxS. 



