ENGELMANN—CUSCUTA. 453 
Systematic Arrangement of the Species of the Genus 
Cuscuta, with critical Remarks on old species and Des- 
criptions of new ones. 
By Grorcre Encrertmann, M.D. 
The genus Cuscura belongs to the natural order of Con- 
voluulacee, to which, indeed, it has been attached by almost 
every botanist, and from which it can not be separated, though 
the embryo is very distinct, being rather a minute plant than 
an embryo in the usual form, the tip forming a plumula, often 
provided with alternate scales, and without cotyledons prop- 
er. Nor ought such a natural group of plants to be split into 
a number of genera on subordinate characters, as has lately 
cen proposed, and in some instances, too, upon erroneous 
0 i. 
_ The characters, which furnish good grounds for a subdivis- 
lon of the genus, are found in the shape of the styles and stig- 
mata and in the fruit. These same characters, it must be ad- 
_ Initted, have been used in separating the old Convolvuli into 
numerous genera and even tribes; so that analogy would jus- 
tify or even require a similar division of Cuscuta y but even 
ke 
