164 BOTANY or CONGO.
the equinoctial relation, but also, to a certain degree, in the 477] more extensive genera of which several of these families consist : and there are even about forty species common to these distant regions.
To the vegetation of Equinoctial America it has certainly much less affinity. Several genera, however, which have not yet been observed in India or New Holland, are common to this part of Africa and America -} and there are upwards of thu^ty species in the Congo herbarium, which are also natives of the opposite coasts of Brazil and Guiana.
As the identity of species, especially of the Dicotyle- donous division, common to equinoctial America and other intratropical countries, has often been questioned, I have subjoined two lists of plants included in the Congo herba- rium, of which the first consists of such species as are common to America and India : and the second, of such as are found in America only.
I have given also a third list, of species common to Congo and India, or its Islands, but which have not been observed in America.
And a fourth is added, consisting of doubtful plants, to which I have, in the mean time, applied the names of those species they most nearly resemble, and to which they may really belong, without, however, considering their identity as determined.
I. List of Plants common to Equinoctial Africa, America,
and Asia,
Gleichenia Hermanni, Prodr. Flor. ^ Fuirena umbellata, L. fil.
Nov. Boll. > Pistia Stratiotes, L.
Mertensia dichotoma, Willd. j Boerhaavia mutabilis, Prodr. Flor. Agrostis Virginica, L. Nov. Holt.
Cyperus articulatus, L. "I 7 Ipomoea pes-caprse, Nob.
— niloticus, Vahl. j^"""^P' Couvolvoulus pes-capra, L. 1 ^^ Lipocarpha argeutea, Nob. "1 — brasiliensis, L. J ' ^'
Hypeelyptum argenteum, Va/il. J Ipomoea pentaphylla, Jacqu.
Eleocharis capitata, Prodr. Fl. N. Eoll. Scoparia dulcis, L.
1 Namely, Elseis, Jacqu. Rivina, Z. Telanthera, Nob. (Alternantherae pen- taiidrai). Alcliornea, Sw. Blechum, Prodr. Flor. Nov. Eoll. (Blechi sp. Juss.) Schwenckia, i. \l-^x>ih, Jacqu. Yandellia, Z. Aunona, Z. Bauisteria, A^o^. (Bauisteriae sp. L.) Paullinia, Juss. (Paulliniae 5/?. Z.) Vismia, Ruiz, et Pav . Couocarpus, Z. Lcgnotis, Sw. (Cassipourea, Aubl.) Chailletia, Decand.
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