PLATE 1 6 



Intermediate stages between a simple spike of the pistillate inflorescence of Euch- 

 laena and an ear of maize: 



A. — Spike of pure Florida teosinte. 



B. — Spike vv'ith slightly shortened axis. 



C. — A* still more compact spike with an increased number of seeds. A-C have 

 single spikelets and separate two-ranked alicoles. 



D. — Spike with single spikelets and yoked alicoles, irregularly four-rowed. 



E. — Compact spike with two-ranked separate alicoles and single spikelets. 



F. — Spike with paired spikelets and four ranks of yoked alicoles. 



G. — Transition stage between four-rowed and eight-rowed ear. 



H. — Ear of maize with eight rather poorly defined rows of seeds. 



