114 



THE STEM. 



plants with exogenous stems bears a pair of cotyledons and unfolds 

 a pair of seed-leaves in germination (Fig. 106, 125) ; hence, Exogens 

 are likewise called Dicotyledonous Plants. 



Sect. Y. The Endogenous ok Monocotyledonous Stem. 



,miMiS.,.„„ 







203. Endogens, or Inside-Growers, although thev have many 

 humble representatives in Northern climes, yet only attain their full 

 characteristic devel- 

 opment, and display 

 their noble arbores- 

 cent forms, under a 

 tropical sun. Yet 

 Palms — the type of 

 the cla^ss — do ex- 

 tend as far north in 

 this country as the 

 coast of North Caro- 

 lina (the natural lim- 

 it of the Palmetto, 

 Fig. 184) ; Avhile in 

 Europe the Date 

 and the Chamaerops 

 thrive in the warm- 

 er parts of the 

 European shore of 

 the Mediterranean. 

 The manner of their 

 growth gives 



mg 

 ance ; 



trunks being V'^sg^'Ki^T-ff 

 unbranched, 



cylindrical columns, rising majestically to the height of fi'om thirty 

 to one hundred and fifty feet, and crowned at the summit with a 

 simple cluster of peculiar foliage. Their internal structure is equal- 

 ly different from that of ordinary wood. 



FIG. 184. The Chamaerops Palmetto, in various stages, and the Yucca Draconis. 



