I-S THE CEREALS IN AMERICA 



isually sterile. Fertile spikelets inflated or ventricose, two- to five-flowered, fruits 

 one to three. Lowest spikelet closely imbricated ; empty glumes broad, one- to 

 many-awTied, sometimes a toothed apex; flowering gUimes rounded on the back^ 

 5ften navicular, many-nerved, ending in one to several awns; fruit slightly com- 

 pressed laterally, deeply sulcate, hairy at the apex, free. Embryo with epiblast and 

 three rootlets. Annual. Two poorly defined sections of which one {MgUops L.) 

 b not cultivated. 



Section II. Sitopyros. Empty glumes sharply keeled. Species three. 



A. Terminal spikelet usually aborted; mature palea falling into the 



parts; lateral teeth of empty glume acute. i. TV. mo^tococcum. 



B. Terminal spikelets developed; palea entire; lateral teeth of empty 



glume obtuse. 



a Empty glumes chartaceous, shorter than flowering glume ; palea 

 as long as flowering glume. 2. TV. sativum. 



h. Empty glumes sometimes longer than flowering glume, charta- 

 ceous, lanceolate; palea of lowest flower half as long as it« 

 glume. 3. TV. polonicum. 



f. TV. monococamt L. Spikes compact, articulate, joints separating, 



spikelets one-awned, usually only lower flowers maturing fruit. 

 S. TV. $m.tivum Lam. Three races. 



I. Rachis articulate at maturity ; grain entirely enclosed by glumes, 

 not falling out when threshed. 



I*. Spikes loose, almost four-sided when seen from above; 

 empty glumes broadly truncate in front, with very short, 

 obtuse middle tooth ; obtusely keeled, a. TV. sat. spelta. 

 2* Spikes dense, laterally compressed; empty glumes taper- 

 ing; middle teeth acute ; sharply keeled. 



b. Tr. sat. dicoccuttu 



n. Rachis not articulate at maturity; fruiting glumes somewhat 

 open ; grain falls out easily. c. Tr. sat. tenax 



a. TV. sat. spelta Hackel. Awned or awnless, hairy or smooth- 



spiked ; white, gray, blue, reddish. 



b. TV. sat. dicoccum Hackel. Always awned. Spikes broader on 



two-ranked side, narrower on imbricated side. 

 C TV. sat. tenax Hackel. Four poorly characterized subraces. 

 I.* Empty glumes distinctly keeled in the upper half, rounded 01 

 only slightly keeled below. 



• Spikes long, more or less loose, somewhat dorsally compressed. 



I' Tr. sat. vulgare. 



• • Spikes short, dense, distinctly four-sided. 



\** Tr, sat, compactum. 

 2.* Empty glumes sharply keeled at the base. 



• Fruit short, thick, not compressed, broadly truncate above. 



\*'* Tr. sat. ttirgidurfu 



