\ 



V 



I 



the final development of the plant, even if it is quite easy to 

 trace the later transformations of some of the organs. 



A few weeks after this first state, and while the cotyle- 

 dons still persist, the hypocotyl commences to increase in 

 thickness, as shown in Fig. 41, and the roots to form branches ; 

 the first leaf (L^) has come out, is cordate and crenate, which 

 ! is characteristic of this variety. By continuation of growth 



the hypocotyl has now been transformed to an obconical body 

 (C in Fig. 40), which is crowned by the swollen bases of the 

 two leaves (L^ and L^), while the root-system has under- 

 gone no change in regard to the further development of 

 secondary roots. The cotyledons have dropped, leaving a 

 semi-lunate scar at the upper part of the hypocotyl, which 

 is shown in Fig. 38. Plate VIII. 



The structure of the rhizome is now indicated, being 

 fleshy and almost toothed, the teeth representing the swollen 

 base of the successively dropping leaves. This may be seen 

 in Fig. 39, which shows the rhizome of a plant one year old, 

 where the primary root still persists, although it has partly 

 faded. The secondary roots (r^) are unchanged, and we see 

 another pair of roots developing a little above them, between 

 the scars of the cotyledons, and alternating with the older 

 -pair (r^). Five teeth are visible in this figure and show their 

 origin very distinctly, the base of the petiole. Tlie rhizome 

 of this specimen was vertical, but it gradually becomes 

 almost horizontal, creeping under the surface of the ground. 

 We have then a strongly developed rhizome before us, of 

 which the leaves are not scale-like, but perfectly normal 

 and densely covering the rhizome. The persistent bases of 

 the petioles and stipules contain a large quantity of starch. 



LEGUMINOS^, 



Lespedeza via I ace a. 



Fig- 43 o" Plate IX shows a germinating plantlet of this 

 species, where we see a long primary root, carrying a (cv^ 

 tubercles, especially upon the lateral branches. The cotyle- 



r 



dons are short-petioled, obovate and obtuse, and the hypo- 

 cotyl IS straight and very distinct. The first leaf is unifoliolate, 



> 



^ 



