ox THE ANATOMY OF MAGNOLIACEtK. x;-J1 



in the roots of K. japonica and S. clu'ncnsis, but in a somewhat old 

 root of S. niyra, 1 found the passages not yet developed, and but 

 little mucilage present. Thus it is seen that the formation of 

 the passages has a close relation to the production of mucilage, a fact 

 which seems to favour the view that the nmcilage is derived from 

 the disorganization of the pre-existing tissue. As to the number ot 

 xylem-plates in the young root, K. japonica and S. nigra agree, both 

 presenting the diarch arrangement ; but in S. chinensis the triarch, 

 as well as the diarch one, may be seen (PI. IV, Fig. 17). The pith 

 is absent in old specimens. 



Tribe IV. Magnolieae. 



Under this tribe I examined the following three genera : 



Magnolia, Michelia, and Liriodendron. 



The anat<3niical elements of these genera may Ije described to- 

 gether, as they present nothing characteristic enough to distinguish 

 the genera from each other. Only one sj^ecies is known to Ijeloug 

 to Liriodendron, and this I examined. Four species of Michelia were 

 examined, and ten species and two varieties of Magnolia. All of 

 these plants are trees and generally attain a great height. Aromatic 

 properties are prevalent among them. The names of the species 

 examined are as follows : 



Magnolia stellata, Miq. 



M. parrißora, Sieb, et Zucc. 



These two are ornamental trees. 

 M. Kolws, I). C. 



Also ornamental. Its wood is used in cabinet work. 

 M. hijpoleuca, Sieb, et Zucc. 



It is one of the most useful trees, its soft wood being ex- 



