xvill LIST OF ILLUSTRATIONS 



13. A spikelet and florets of Kentucky blue-grass : a, spikelet as 



it appears at maturity ; b, the same, having the florets 

 spread apart, showing jointed rachilla ; c, back view of 

 a floret, showing the lemma (1) ; d, front view of the 

 floret, showing the edges of the lemma (1), the palet (2), 

 and the rachilla segment (3) ; e, the grain, or kernel . 156 



14. Mixture of seeds of Kentucky blue-grass (a) and Canada 



blue-grass (b). The Kentucky blue-grass seeds are 

 broadest at the center, pointed, and have a distinct ridge 

 on each side. Canada blue-grass seed are mostly broad- 

 est near one end, blunt, and smooth on the sides . . 162 



15. Seeds of redtop representing the "fancy" grade of the 



trade : a, different views of seeds having the white, 

 papery, inner chaff ; b, two views of a grain, or kernel, 

 with the inner chaff removed ; c, the same nearly natu- 

 ral size ... . . . . . . . 174 



16. Chaff of redtop seed : a, Whole spikelets, usually devoid of 



seed in "chaffy" grades; b, separated scales of the 

 same ; a and b represent the outer chaff of the seed. 

 (Enlarged.) . ' t , t . . . . . 175 



17. Orchard-grass (Dactylis glomerata} : a, spikelet; b, floret; 



c, stamens and pistil ; d, ligule ; e, section of node . 177 



18. Mixture of seeds of orchard-grass (a), meadow fescue grass 



(b) , and English rye-grass (c). The orchard-grass seeds 

 are distinguished from the others by their slender, curved 

 form. The meadow fescue and rye-grass seeds are dis- 

 tinguished by the difference in the section of the seed- 

 cluster axis (rachilla segment) which each bears. (En- 

 larged.) 185 



19. Tall oat-grass (Arrhenatherum elatius) : a, spikelet ; b, the 



two florets . . .-... . '. . 189 



20. Brome-grass (Bromus inermis} : a, spikelet; b, floret, dor- 



sal view ; c, floret, vertical view 196 



21. Meadow fescue (Festuca elatior'} : a, spikelet . . . 205 



22. Italian rye-grass (Lolium multifloruni) : a, spikelet ; b, c, 



lemma ; d, e, seed 214 



