Hill, — A Revision of the Geophilotts Species of Peperomia. 147 
Mexican and Central American Species. 
P. ovato-peltata 
P. claytonioides 
P . pinulana 
P. bracteata 
P. pedicellata 
P. campylotropa 
P. gracillima 
P. mexicana 
P. monticola 
P. macrandra 
All the species appear to fall into the section (A.) Eutildenia of 
Dahlstedt *, and they may be regarded as forming a distinct subsection, 
which for convenience will be termed Geophila. 
It is, however, possible that some members of Miquel’s subgenus 
Panicularia 2 , as amplified by Dahlstedt 3 , should be included with the 
geophilous species, although no evidence has been obtained from seedlings. 
P. cotyledon 4 , particularly, which has a tuberous rhizome and peltate 
leave?, shows considerable external resemblance to species of the Eutildenia 
section, and the fruits are also of a similar type. The peculiar character of 
the compound spike or paniculate inflorescence therefore may have caused 
a separation of species which are really closely allied. 
The position and characters of the subsection are as follows : — 
Peperomia. 
Subgenus V. Tildenia Miq. 
Sectio A. Eutildenia Dahlst. 
Subsectio I. Geophila A. W. Hill. 
Tuber hypogaeum vel rhizoma tuberosum. Folia ad caulis basin 
rosulatim congesta, + peltata, glabra. Bractea peltata. Planta novella 
(germinans) cotyledonibus longiuscule petiolatis heteromorphis ; unius bre- 
vioris lamina minuta, hypogaea, in semine inclusa, quasi haustorium referens ; 
alterius lamina parva, peltata, viridis, foliis assimilatoriis similis. 
Clavis Specierum. 
A. Tuber hypogaeum basi radicibus instructum. Bacca + ovoidea, apice 
scutulo late conico praedita. If Parvifoliae, 
(1) Lamina orbicularis, circa 1*5 cm. diametro, coriacea. Amenta 3-4 cm. 
longa. 
P. cyclaminoides. 
Amenta 4-8 mm. 
(2) Lamina parva, + ovata vel elliptica, carnosula. 
longa. 
§ Lamina + ovato-orbicularis. 
f Bacca ovato-elliptica, verrucosa. P. parvifolia . 
ft Bacca ovata, valde verruculosa. P. verruculosa , 
§§ Lamina + elliptica, minuta. 
Bacca ovato-elliptica, minute punctata. P. minuta, 
1 Dahlst. in Kong. Svenska Vet. Akad. Hand. Bd. 33, no. 2, 1900. 
2 Miq., Syst. Pip., p. 117 5 Dahlst., 1 . c., p. 49. 
1 Benth., PI. Hartweg., in montibus Huacabamba, p. 148, Plartweg 833 ; cf. also P. umbellata , 
Miq., ChachapoyaS, Peru; Matthews, No. 3230. Herb. Kew. 
