100 
In the second diagram the names and sequence of the groups 
are the same, only Sympetalae and most Apetalae have not been 
included. The names are shifted slightly right or left to call 
attention to additional possible relationships indicated by dotted 
Campanulatae 
Rubiales ee 
cy 
Bo 
2 
= 
o 
a 
Rhamnales 
Sapindales 
Geraniales 
ales 
Sarraceniales 
Rhoeadales — 
sty anales 
Centrospermae 
a) 
olygonales 
Aristolochiales 
Santalales 
by 
° 
ot 
o 
bal 
© 
a 
wW 
Urticales 
] 
Balanopsidales 
Myricales 
Salicales 
4) 
iperales 
waits eee bale an ac te Verticillatae 
Fic. 7. Synopsis of the Orders of Dicotyledons according to their mutual 
relationships. After Engler, 1897. (4295) 
lines. Numerous resemblances become explicable by a rearrange- 
ment of certain groups. The fact that parietal placentation in 
the bud often precedes axile placentation in the flower may 
reasonably be supposed to be another case where ontogeny 
recapitulates phylogeny. From separate placentae to united 
