454 



STRUCTURE . AND LIFE HISTORIES 



"seed-leaves," or cotyledons, and on this basis Ray 

 (1628-1705), the noted English botanist, divided the 

 class of Angiosperms into two large sub-classes — mono- 



FiG. 338. — Morphology of typical monocotyledonous plant. A, leaf, 

 parallel-veined; B, portion of stem, showing irregular distribution of vas- 

 cular bundles; C, ground plan of flower (the parts in 3's); D, top view of 

 flower; E, seed, showing monocotyledonous embryo. 



cotyledons and dicotyledons} These two groups are dis- 

 tinguished by other characters which are quite con- 



^ Plants like Finns having more than two cotyledons are polycolyledons . 



