454 



STRUCTURE AND LIFE HISTORIES 



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

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

 major groups, flowering herbs (herbce perfects} and trees, 



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*5); D, top view of 

 flower; E, seed, showing monocotyledonous embryo. 



into two sub-groups monocotyledons and dicotyledons. 1 

 These two groups are distinguished by other characters 



1 Plants like Finns having more than two cotyledons are polycotyledons. 



