138 



STRUCTURAL BOTANY. 



[118. 



clustered, or crowded upon it, as Plantain, Mullein, 

 Vervain. The so-called spikes of the Grasses are com* 



435-a, Spiranthes cernua flowers in a twisted spike. 436-a, Orontium aquatic um flowers on a naked 

 spadix. 437, Betula lenta flowers in aments. 



pound spikes or spike-like panicles, bearing little spikes 

 or spikelets in place of single flowers (440). 



442 440 439 



438, Andromeda racemosa flowers in a secund raceme. 439, Verbascum Blattaria raceme. 440, Lo- 

 lium perenne a compound spike or a spike of spikelets. 441, Dipsacus sylvestris head with an involucre 

 of leaves. 442, Qsmorhiza longistylis a compound umbel. 443, Its fruit. 



