Hill, — A Revision of the Geophilous Species of Peperomia , 159 
species. P. campylotropa and P. gracillima occur on the Pacific side 
of Mexico, whilst P. mexicana is found on the Atlantic side of the country 
in the Cordillera of Vera Cruz. P. macrandra from the province of 
Oaxaca appears to be the most southerly of the Mexican species. 
All the species seem to be somewhat definitely localized, and with 
the exception of P. monticola , and perhaps some specimens referred to 
P. campylotropa , are all distinctly shade-loving plants. P. bractcata , and 
P. campylotropa to a much slighter degree, show some xerophytic 
characters in their verrucose fruits, but the leaves in these species are thin 
and membranous, and in some (e. g. P. gracillima ) are very delicate. 
The various species are in nearly all cases easily recognized and 
sharply defined, the bulbous habit and seedling structure being the principal 
points of similarity. P. pedicellata , P. mexicana , and P. macrandra show 
some affinity judging from their fruits and leaves, and P. ovato-peltata , 
P. claytonioides and P. pinulana form a very natural group, or perhaps they 
are only slightly different forms of the same species. 
Of the remaining species there is little to be said. P. monticola is 
a very distinct form, and perhaps should not be included in this group. Of 
P. campylotropa and P. gracillima we have not sufficient material to point 
out their relationships. 
Four new species of these geophilous Peperomias have been found 
in the last two or three years, and a careful examination of material, which 
has lain in Herbaria for many years, has revealed three or four distinct 
species hitherto confused with species already described. It seems, there- 
fore, highly probable that there may be several species, as yet unknown 
to science, in the mountains of Central and South America, and a knowledge 
of their biological characters, seedling structure, and conditions of life would 
doubtless yield results of the highest interest. 
EXPLANATIONS OF FIGURES IN PLATE XV. 
Illustrating Mr. A. W. Hill’s Paper on Peperomia. 
The sections of the fruits are from photographs. 
Fig. 1. P. macrandra , C. DC., a young seedling showing the laminae of both cotyledons and 
the tuber. c x — absorbent, <r 2 = assimilating cotyledon. 
Fig. 2. An older plant. Two plumular leaves have developed and the tuber has enlarged. 
Fig. 3. P. Gandichaudii , a young seedling, with its seed. The tuber is obscured by the 
closely felted roots. 
Fig. 4. An older tuber seen from above, showing the two cotyledon scars and the point of 
emergence of the roots. 
