1922] BAILEY—ANT-PLANTS 373 
specific stages in the ontogeny of the plant. For example, the 
leaves of adult individuals always are deeply lobed and undulate 
on the margins, never scabrous on the upper surface or conspicuously 
Fig. 3.—Cecropia angulata: terminal shoot of tall, vigorous young tree, showing 
8 tlie cae and foliar and florial bracts; X#4 —Photograph by Joun TEE-VAN. 
tomentose below; whereas the leaves of juvenile plants always are 
hairy or sharply asperate above, and are densely albido-tomentose 
on the under surface. It is evident, therefore, that in distinguish- 
