HOW TO KNOW THE GRASSES 



15a. Spikelets laterally compressed or round 

 in cross section (Fig. 30); no sterile flo- 

 rets below the perfect ones 16 



15b. Spikelets usually dorsally compressed (Fig. 



31), consisting of a perfect floret and an 



empty lemma or staminate floret and two 



(rarely one) glumes below it 18 



^ 



K/ 



Figure 30 



Figure 31 



16a. Spikelets sessile or nearly so, borne along the lower sides of one 

 to many spikes TRIBE VII, CHLORIDE AE, page 131 



16b. Spikelets borne on pedicels in panicles, not exclusively on the 

 lower sides of branches 17 



17a. Spikelets with a single perfect floret and no sterile 



or rudimentary ones. Fig. 32 



TRIBE V, AGROSTIDEAE, page 102 



17b. Spikelets with two florets, the lower perfect and 

 the upper staminate; both glumes longer than the 

 florets see Fig. 190. (Holcus lanatus) 



Figure 32 



18a. Glumes and sterile lemma soft and papery; 

 first glume shorter than the spikelet; fertile 

 lemma and palea stiff or leathery. Fig. 33 

 TRIBE XI, PANICEAE. page 149 



Figure 33 



19 



