40 



II. TRITICEAE (HORDEAE) 



A. Spikelets solitary at each joint of rachis 



B. Spikelets inserted on two sides of 3-sided rachis (usually appearing 



1-sided) 1. Nardus 



B. Spikelets alternating on opposite sides of rachis 



C. Spikelets inserted edgewise toward flat rachis 2. Lolium 



C. Spikelets with broadside toward flat rachis 



D. Glumes less than 2.5 mm broad, perennials (weeds or 



native) 3. Agropyron 



D. Glumes greater than 4 mm broad, cultivated annuals 



E. Glumes 3-nerved, rounded back, lemma rounded, 



long-awned or awnless; rarely cultivated ... 4. Triticum 



E. Glumes 1-nerved, keeled, lemma sharply keeled, 



tapering to long awn; occasionally cultivated and 



commonly planted on roadbanks 5. Secale 



A. Spikelets more than 1 at each joint of rachis 



F. Spikelets 3 at each joint of rachis, lateral pair sterile and reduced to 



long awns 6. Hordeum 



F. Spikelets 2 at each joint of rachis 



G. Spikelets well separated, nearly perpendicular to stem, glumes 



reduced to 2 short bristles or lacking T.Hystrix 



G. Spikelets dense, ascending, glumes equalling the florets 



8. Elymus 



1. NARDUS Mat Grass 



Small grass with one-flowered spikelets in slender, terminal spikes; 

 spikelets inserted on two sides of 3-sided rachis, thus sometimes appearing 

 1-sided. Genus with a single species, placed in the tribe Nardeae by Gould 

 (1968). 



1. Nardus striata L. Mat Grass 



Old fields and pastures. Introduced from Europe. Rare in N.H. 



Known from Sandwich, Carroll Co.; Waterville, Grafton Co.; Andover, 



Merrimack Co., and Sharon, Hillsboro Co. 



2. LOLIUM Darnel 



Inflorescence condensed into a thin spike with spikelets inserted 

 edgewise toward the flat rachis. Weedy, introduced from Europe. 



A. Glumes nearly as long as spikelets; lemmas without awns L. perenne 



A. Glumes much shorter than spikelet; lemmas awned L. muhiflorum 



1. L. perenne L. Common Darnell, Ryegrass 



Perennial of lawns and roadsides; occasional weed. Introduced 

 from Europe. 



2. L. multiflorum Lam. Italian Ryegrass 



Annual of dooryards, fields and waste areas; occasional weed. 

 Introduced from Europe. 



