VOLUME XXX NUMBER I 
BOTANICAL “GAZETTE 
FULY, 1900 
ON THE ENDOSPERM AND EMBRYO OF PEPEROMIA 
PELLUCIDA. 
DuUNCAN S. JOHNSON. 
a 
(WITH PLATE I) 
In the spring of 1899 I began the study of the Piperacee, 
with well-preserved material of the genera Peperomia, Heckeria, 
and Piper, collected by the late Professor J. E. Humphrey on the 
unfortunate expedition to Jamaica in 1897. It was soon dis- 
covered that seeds were needed for sprouting in order to complete 
the work, and it was therefore laid aside temporarily and my 
time given to work on the related genus Saururus. 
The recent paper by Professor Campbell (’99) on Peperomia 
pellucida announced results differing from those I had obtained, 
and led me to reexamine my slides, with the result that I was 
satisfied with the essential correctness of my former observa- 
tions, and noted several interesting features in addition. As the 
intended detailed study of the group may be deferred for some 
time, an outline of the most important observations thus far made 
on Peperomia pellucida Kunth is given here. 
The flower consists of two stamens, and a carpel sessile in 
the axil of a top-shaped bract (dr, fig.1). The ovule is single, 
basal, and orthotropous (fig. 7), with a single integument and one 
archesporial cell. The development of the flower as far as fol- 
lowed agrees with the account given by Schmitz (’72), and the 
development of the macrospore in the nucellus is as described by 
Campbell. 
I 
