XX. On two Genera of Plants belongin hy the Natural Family of ibe 
: urantia, By Jofeph Corréa de Serra, LL.D, F.R.S. €? L.S. 
Read Fuly 2d, 1799. 
Lu obje& of this paper | is to examine the generic characters 
. and the natural affinities of the Crateva Marmelos of Linné, 
and of the Crateva Balangas of Keenig; two plants, each of which 
I conceive to bea genus by itfelf, not only diftinct from the Crateva, 
but alfo balneis: to a different natural order. _ 
Among the many advantages. deriving to: botany from. the: pro- 
 grefs made of late in the knowledge of the natural affinities of plants, 
one of the moft obvious is the facility i it affords in many inftances, 
of recalling to their natural, places, plants which, by overfights un- 
avoidable in artificial fyftems, even the moft ingenious, ‘had been 
affociated to extraneous genera. Of this advantage the examina- - 
tion of the two plants above mentioned will, I. prefume,. afford an | 
example. 
The affinity of the genus CAE (fach asi t was firft conflituted ` 
by Plumier *, and adopted by Linnét,) to all the genera of the Cap- 
parides, is obvious to every inquirer of natural affinities. However 
different the principles might have been on which natural arrange- 
ments of plants have. been attempted, this affociation has been al- 
d 
* Under the name of Tapia. Plum. Nova. Plant, Gen. p. 22, t, 23. = 
~ 4 In the firft edition of Gen, Pi, «113. 
we 6 
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Ways 
