EXPLANATION OF PLATE XV. 



[Figures natural size, except wlierc otlierwiso noted.] 



Fig. a, })ranch from a lower liuib bearing male iiilloiesceiice with llowers in a (Icn.se cluster (fir.st week of April, 

 southern Alabama) ; h, c, branch with two .subterminal aments of female Mowers below which are two immature cun.s 

 of one season's growth; >l, detached male flower showing basal involucral scales, magnified 3 diameters; c. germi- 

 nating seed (February); /, same seedling one month later (March) with 7 cotyledcms in the midst of which the 

 terminal bud shows the prinmry leaves appearing; g, seedling about the close of the first season with terminal 

 cluster of true (secondary) leaves, below wliich are seen the withered primary leaves; li, i, transver.se section through 

 base of two and three leafed leaf bundle, magnilicd TA) diameters, showing outer small hypodermal cells, the stomata 

 appearing as marginal white spots; next a broad band of large in-walled parenchymatous cells bearing chlorophyll, 

 within which, at the angles of the leaf, resin ducts appear as large openings; the dark areas in the center are libro- 

 vascular bundles surrounded by a single row of tliin-walled cells (bundle sheath). 



94 



