74 



different form in regard to the divisions. These are more 

 compound than those of the first-mentioned specimen, and 

 the divisions are not ovate, but cuneate, with the margin 

 sparingly dentate. Another circumstance is that, while the 

 final leaves are densely pubescent, this leaf is almost glabrous. 

 The specimen figured in Fig. 71 is one year old, the 

 primary root has increased in length and thickness, and has ' 



developed several long, filiform lateral roots. A rhizome 

 (Rh.) is already formed, and it consists of the short internodes 

 of the first year, carrying the above-mentioned leaf (L^) and j^ 



two other ones of which the second shows the same shape 

 as L^, while the third one has the normal form, described 

 above. It is therefore shown that the first leaves in the 

 second year of the life of the plant are different in form from 

 the later ones, a fact which seems to be constant. 



We see, if we examine a full-grown plant, that the leaves 

 show the same different aspect in regard to the size and shape 

 of the divisions, and it is always the leaves that are the first 

 to develop in the spring which have the smallest and almost w' 



cuneate divisions. In regard to the rhizome, this is vertical 

 and rather short, carrying several small buds, which will 

 develop leaves in the following years. The primary root 

 persists, as it seems, as long as the plant lives, and 

 several secondary roots are developed from the base of the 

 rhizome, some of which are thick and similar to the primary 

 root and contain a large deposit of starch, or they are thin, 

 very strong and much branched like the common roots. It is 

 to be noted, in regard to this plant, that it seems as if it had 

 been hitherto overlooked, that it has dimorphous leaves, a ^ 



character which ought to be mentioned in the diagnosis of 

 the species. 



Santciila Marylandica, 



The cotyledons are long-petioled, with an ovate-lanceolate 

 blade, which is short-pointed (Plate XI, Fig. 72). The hypoco- 

 tyl is straight, well developed, as is also the long and slender 

 primary root, which is shown in Fig. 73. These are the fea- 

 tures in general for the primary stage of development, but 



