ORDER 155. GRAMINEJB. 



405 



2 If. pusillum N. Culm ascending, 412' ; lateral fls. awnless; central fl. 8, with 



3 subequal awns (1") ; spike linear, 12' long. (2) Ohio, and W. May. 



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



24' ; fls. all fertile, fruit in 4 rows. (T) Cultivated. May. 



4 H. DifriciiuM. Two-rowed S. 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 rachis, 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) 

 GYMNOSTICHUM. 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. VIrgiiilciis 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 (6 10") awns. y. Banks. August. 

 ft. areu^^ns. (a) Glumes thickened and connate-arcuate at the base. S. 



2 E. Europieus 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. 11 River banks, South. 



3 E. Cauadeiisis L. (b) Spikes 4 8' 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 

 (7 13") those of the lance-linear plumes; culm 3 5f. 2; Banks. August. 



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



hispid-pubescent ; awns subequal, 3 or 4 times longer than the flowers, it Bank* 

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

 /3. ttllosus. 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, $' lon, 

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

 dimentary. Mr. J. Woff sends specimen from Illinois 

 with awn-like glumes 4 8" long. 2i Woods. July. 



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

 U\vd., 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. pereniio L. Ray Darnel, (a) Smooth, simple, 

 121'; spike 58' ; spkl. 1520, oblong, 56", awnless, 

 f-13-flowered, flowers exceeding the glume. % Fields. 

 May. June. 



