APPENDIX. No. V. 479 
Cassytha pubescens Prodr. Flor. Nov. Hydrocotyle asiatica L. 
Foil. Hedysarum adscendens Sw. 
Celtis orientalis L. Hedysarum vaginale L. 
Cardiospermum grandiflorum Sw. Pterocarpus Ecastophyllum L. 
Paullinia pinnata L. 
On these lists it is necessary to make some observations. 
Ist. The number of species in the three first lists taken together is equal to 
at least one-twelfth of the whole collection, The proportion, indeed, which 
these species bear to the entire mass of vegetation on the banks of the Congo 
is probably considerably smaller, for there is no reason to believe that any of 
them are very abundant except Cyperus Papyrus and Bombax pentandrum, 
and most of them appear to have been seen only on the lower part of the river. 
2nd. 'The relative numbers of the species belonging to the primary divisions 
in the lists, is analogous to, and not very materially different from, those of the 
whole herbarium ; Dicotyledones bemg to Monocotyledones nearly as 3 to 1; 
and Acotyledones being to both these divisions united! as hardly 1 to 16: 
hence the Phzenogamous plants of the lists alone form about one-thirteenth of 
the entire collection. 
The proportions now stated are very different from those existing in the cata- 
logue I have given of plants common to New Holland and Europe;* in which 
the Acotyledones form one-twentieth, and the Phanogamous plants only one- 
sixtieth part of the extra-tropical portion of the Flora; while the Monoco- 
tyledones are to the Dicotyledones as 2 to 1. 
The great proportion of Dicotyledonous plants in the lists now given, and 
especially in the two first, which are altogether composed of American species, 
is singularly at variance with an opinion very generally received, that no well 
established mstance can be produced of a Dicotyledonous plant, common to 
the equinoctial regions of the old and new continent. 
3d. The far greater part of the species in the lists are strictly equinoctial ; 
a few, however, have also. been observed in the temperate zones, namely 
Agrostis virginica, belonging, as its name implies, to Virginia, and found also 
on the shores of Van Diemen’s Island, in a still higher latitude; Cyperus. 
Papyrus, and articulatus, Nymphaea Lotus, and Pistia Stratiotes, which are 
* Flinders’ Voy. 2. p. 592. 
