118 



STRUCTURAL BOTANY. 



sessile flowers either scattered, clustered, or crowded upon it, 

 as Plantain, Mullein, Vervain. The so-called spikes of the 



*35, Spiranthes cernua flowers in a twisted spike. 436, Orontium aquaticum flowers on a naked 

 spadix. 437, Betula lenta flowers in aments. 



Grasses, as Wheat, Timothy, are in fact compound spikes, bear 

 ing little spikes or spikelets in place of single flowers (440). 



442 440 



441 



438 



438, Andromeda racemosa flowers in a secund raceme. 439, Wrbascum Blattaria raceme. 440 

 Lolium perenne a compound spike or a spike of spikelets. 441 Dipsucus svlvestris Iw^id with an In 

 volucre u! leaves. 442, Osmorlii/.H lonsristylis a compound umbel. 443. Its fruit. 



