EXPLANATION OF PLATE XV. 



[Figures uatural size, exceiJt wliere otherwise noted.] 



Fig. o, branch from a lower limb bearing male iniioresceuce with flowers in a dense cluster (first week of April, 

 southern Alabama) ; /), c, branch with two subterminal aments of female flowers below which are two immature cones 

 of one season's growth; rf, detached male llowcr xlmwiii;; li;is:il iiivolncral scales, magnified 3 diameters; e, germi- 

 nating seed (February); /, same seedlinn" one mouth latri- i Maiilii with 7 cotyledons, in the midst of which the 

 terminal hud shows the primary leaves apiicaring; ;/, secilliiiK alxuit the close of the first season with terminal 

 cluster of true (secondary) leaves, below which arc seen the withered ])rimary leaves; li, i, transverse section through 

 base of two and three leafed leaf bundle, magnified 50 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 arpas in the center are fibro- 

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

 100 



