311 
and C. £pithymum; to the second all our native species. The 
latter may be divided into those with ovate scales and short, irreg- 
ular processes, of which C. arvensis is a type; and those with 
ribbon-shaped scales and long regular processes, of which C. 
Gronovit is a type. One species, C. cuspidata, is intermediate in 
scale-characters between these two divisions, though nearer to 
the type of arvensis; and three others have the scales greatly re- 
duced, of which one, C. Coryli, is closely connected with C. a- 
decora, of the arvensis type; another, C. Polygonorum, seems related 
to C. arvensis itself; and the third, C. Cephalanthi, has the scales 
of moderate size and also of this type. 
The long-fringed scales are remarkable in their shape, and are 
fringed thickly at the tip, but very sparingly towards the base, 
with long rounded processes. In‘two of the species, C. Gronovii 
and C. rostrata, they appear softer and more flexible than in the 
other two; but the chief reliance in separating these must be 
Placed on the corolla lobes and on the serrate bracts which sur- 
round the calyx in the two last species. 
While this division of our Northeastern American species is 
by no means as exact as that ordinarily given; yet as it depends 
only on characters observable in the dissected flower, it may be 
found at times more convenient than that based on the position 
of the withered corolla on the fruit, a point only seen in fruiting 
specimens, and then not always easy to determine, as the corolla 
in some species soon falls away. 
DIVISION OF CUSCUTA ACCORDING TO SCALE-CHARACTERS. 
I. Scales crenulate, 
* Scales not incurved, less than one-half as long as the corolla-tube, crenulate at 
sen an Ene he at he 1. C. Epilinum. 
* Scales strongly. incurved, about one-half the tube length, crenulate to the 
hase 2. C Epithymum. 
Pe Unie ati ie iar Sees Rear, 
anaes i ah UE oak feet "hee ange Ces ne gee ray Oe gt paeg ee Low ha ads, ae eek! 
* Scales large, ovate, isaeiiy fringed to the base with short, irregular processez. 
+ Corolla lobes recurved, acute, aslongastube.. . . 3. ©. arvensis. 
++ Corolla lobes incurved, broad triangular, half as long as tube. _ 
4. C. indecora. 
iss Beales small or nearly aborted (but apparently similar in general type to the 
last division). 
t Scales variable, almost aborted, tips of corolla lobes inflexed. 
5. C. Coryli. 
