Ranales, Rhoeadales , and Rosales. 
721 
Rosales. 
The seedling anatomy of some forty species has been worked out, of 
which more than half belong to the Natural Order Rosaceae, while members 
of the Crassulaceae, Saxifragaceae, Pittosporaceae, Hamamelidaceae, and 
Platanaceae are included, together with a few species of the Leguminoseae 
not recorded by Compton. 
So far as our information goes, the Crassulaceae and Saxifragaceae are 
diarch, the Pittosporaceae and Hamamelidaceae tetrarch, while the Rosaceae 
37 B 
Text-figs. 35—37. 35, Prunus spinosa ; 36, Prunus avium ; 37, A and b, Primus persica . 
All nat. size. 
and Leguminoseae show both varieties of the cruciform type. The cohort 
also includes forms which are suggestive with regard to the possible 
relationships of the cruciform and diagonal types. 
Rosaceae. 
The members of the Spiraeoideae and Rosoideae, so far as examined, 
are diarch, the Prunoideae tetrarch, while within the Pomoideae both 
tetrarch and diarch forms are found, as well as hexarch and even octarch 
arrangements, which suggest a possible connexion with the diagonal type. 
Prunoideae. 
Prunus persica, P. spinosa , P. Cerasus , P. avium . and P. amygdalus var. 
amara. The five species of Prunus examined show the same hypocotyle- 
donary structure, but with an interesting variant in connexion with the 
