Harris — The Germination of Pachira. 209 



be found, since in some cases it seems that the habit of the 

 seedling may be traced to differences in ecological conditions. 

 From a taxonomic standpoint it is certainly worthy of note, 

 and especially so in a genus presenting the difficulties which 

 Pachira does. The comparative development of hypocotyl 

 and epicotyl is interesting when we compare the structure of 

 the seeds of C insignis ( = P' aquatica ) as figured by Martius 

 with the seed of P. cami^estris, since in both the radicle and 

 the plumule seem to show about the same degree of develop- 

 ment. 



The reduction of P. oleagina will take one from the list of 

 nominal species known from recorded examination to have one 

 cotyledon larger than the other. 



EXPLANATION OF ILLUSTRATIONS. 



Plates IX-XI. 



Plate IX. — 1, 2. Embryo of Pachira viewed from dorsal and ventral sur- 

 face of large cotyledon. — 3, Another seed viewed from inner surface of 

 large cotyledon: 2 and 3 with lateral lobes somewhat spread apart to show 

 small cotyledon. — 5-7. Young seedlings. — 4. A portion of a somewhat 

 older specimen, showing general habit and stages in the reduction of one 

 cotyledon. — All X 1- 



Plate X. — 8. Later stage of No. 7, showing abnormal development. — 9. 

 Seedling of same age as those on Plate IX showing normal development 

 of plumule. — All X !• 



Plate XI. — 10-12. Three stages in development of a seedling: 10 as in 

 Plate IX; 11 several days older; 12 some months older showing dilatation 

 at base of stem. — 10 X 1- — H. 12 X i- 



Isstted December 12, 1903. 



