378 BOTANICAL GAZETTE [DECEMBER 
Owing to the variability of many of the floral characters during 
the enlargement of the aments, there is a considerable element of 
uncertainty in comparing inflorescences which are not in equivalent 
stages of differentiation. In the case of the male aments, the 
anthers, and especially the filaments, do not attain their most 
characteristic size and shape until just before dehiscence. Further- 
more, there are two distinct stages in the differentiation of the female 
aments, one before and one after fertilization. The changes in the 
size and form of the perigones during the maturation of the ovules, 
and subsequently during the enlargement of the seeds, are reflected 
in the aments, whose external characters become correspondingly 
modified. The significance of these developmental stages does not 
appear to have been appreciated fully by a number of students of 
the species of Cecropia: The aments, perigones, stamens, seeds, 
etc. are described and are used for diagnostic purposes without 
reference to their variability or to their particular stage of develop- 
ment. Until more is known concerning the variability of the 
various species of Cecropia, and until their more stable diagnostic 
characters have been isolated and fully described, it is desirable 
to give rather comprehensive descriptions of new species. The 
following description of the myrmecophytic species of the Kartabo 
region is based upon the study of typical adult specimens. The 
juvenile characters have been referred to previously. 
Cecropia angulata, sp. nov.—Arbor 10-25 m. altus, caulibus 
ramisque juvenibus argute asperatis formicosis (Azteca). Folia 
ampla rubella vel viridia 56-98 cm. longa 56-84 cm. lata profunde 
9-11-lobata, lobis cuneato-obovatis vel spatulatis, apice obtusis 
vel rotundatis saepissime mucrontis, margine undulatis, lobo medio 
36-60 cm. longo 13-24 cm. lato, nervis secundariis 15-20, lamina 
supra glabra nitente (post exsiccationem castanea obscurata) infra 
in nervis venis venulisque galbrata, in areolis solis tenuiter (micro- 
scopice) albido araneoso-tomentosa et in disco centrali breviter 
griseo-villosa, petiolo cylindrico (post exsiccationem costato) 50- 
120 cm. longo glabro vel albido-tomentoso ad basin incrassato et 
cum trichilio albido (tardius castaneo) instructo. Stipulae vagin- 
antes maximae castaneae paullo griseo-tomentosae. Amentae 4 
14-18 rectae rigidae angulatae 5-12 cm. longae 4-7 mm. crassae in 
