ORDER 155. GRAMINE.E. 



40; 



2 If. pusillum N. Culm ascending, 412'; lateral fls. awnless; central fl. , with 



8 snbequal awns (7'') ; spike linear, 12' long. Ohio, and W. May. 



3 H. VULGARE. Four-rowed E. Culm 2 4f; Ivs. broad, auricled at base; spike thick, 



2-4' ; fls. all fertile, fruit in 4 rows. Cultivated. May. 



4 H. DIP TICHUM. Tico-rowed B. Culm and leaves as above. Lateral fls. abortive* 



fruit arranged in two rows. (I) More common in cultivation. June. 



54. ELYMUS, L. LYME G. WILD RYE. Spikelets 

 2 4 at each joint of the racliis. 2-6-flwd. Gl. 2, subulate, 

 placed ou the outer side of their spikelet, forming an invo- 

 lucre to the group, sometimes minute, or obsolete. 

 Pales coriaceous, involving the grain, the lower 

 acute or awned. (See Addenda.) 



ELYMUS proper. Involucre present, consist- 

 ing of the conspicuous glumes. . . (a) 

 GYMN6sTicHUM. Invol. glumes small or mi- 

 nute, or obsolete No. 6 



a Spikelets 5-8-flowered, soft-pubescent, 



without awns No. 5 



a Spikelets 1-5-flowered, hard, rough, with conspicuous awns.. .(b) 



b Spikelets glabrous, merely rough, 2- or 3-flowered No?. 1, 2 



b Spikelets hispid with hairs, 1-3- or 2-5-flowered Noe. 3, 4 



1 E. Virgiiiicus L. Culm erect, 3 4f, smooth ; Ivs. broad, flat, scabrous; spike 



3 5' long, thick, erect, often sheathed at base; gl. lance-linear, strongly veined, 

 tipped (as well as the 2 or 3 fls.) with short (610") awns. TJ: Banks. August. 

 ft. areir tns. (a) Glumes thickened and connate-arcuate at the base. S. 



2 E. Europreiis L. Culm erect, 3 5f; Ivs. broad, flat, scabrous; spike suberect, 



68', exserted; spkl. in 3's, 2-flowered, scabrous, each with 4 long (H 2') straight 

 awns ; glumes linear, 5-veined. 7f River banks, South. 



3 E. Caiiadciisis L. (b) Spikes 48' long, rather loose, nodding, hairy; spike- 



lets (b) in 2's and 3's, 3-fi-flwd. ; awns of the flowers (c) usually curved, longer than 

 (713") those of the lance-linear glumes ; culm 3 5f. li Banks. August. 



4 E. strlatus Willd. Spike 34' long, dense, suberect ; spikelets in pairs, 1-3-flwd., 



hispid-pubescent; awns subequal, 3 or 4 times longer than the flowers, y. Bauka 

 and rocky woods. Culm slender, 2 3f. August. 

 /3. tillbftug. Culm 3 4f, sheaths villous, and the glumes very hairy. 



5 E. mollis Trin. Culm 2 4f, stout, soft-pubescent above, as well as the erect 58- 



spike ; spikelets in pairs, about 7-flwd. ; leaves and sheaths smooth. Shores, N-W. 



6 E. HIstrix L. Hedgehog G. Glabrous, tall (3 4f ) ; spike erect, 46' ; spikeleta 



remote on the flexuous rachis, widely divergent, 2- or 3-flwd. ; fls. subulate, i' long, 

 their awns straight, 1' or more ; glumes commonly ru- 

 dimentary. Mr. J. Wolf sends specimen from Illinois 

 with awn-like glumes 48" long. %. Woods. July. 



55. LOLIUM, L. DARNEL G. Spkl. Co 

 ilvvd., sessile, remote, placed edgewise to the 

 axis, the terminal one with 2 glumes, the lateral 

 with but 1. Pales herbaceous, the lower awned 

 or mucronate. 

 * L. perenne L. Ray Darnd. (a) Smooth, simple, 



1 2f ; spike 58' ; spkl. 1520, oblong, 56", awnless, 



T-13-flowcrcd, flowers exceeding the glume. U Fields. 



May, June. 



