Monography of the North American Cuscutinem. 337 



the ovate obtuse lobes of the calyx ; stamens shorter than the 

 limb ; the scales ovate, laciniate, nearly appressed ; styles equal 

 to the depressed ovary ; capsule depressed, covered by the re- 

 mains of the corolla. 



On Cephalanthus ; also on Yernonia, Aster, Boehmeria, and 

 other plants, (especially Compositse,) on the margin of ponds and 

 swamps near St. Louis, where it is the most common species. 

 I have observed it since 1833 ; but have only met with it in the 

 immediate vicinity of Cephalanthus. July to September. 



The whole plant is whitish or pale yellow ; the stem high and 

 much branched ; the flowers sometimes clustered and nearly ses- 

 sile, but generally more or less pedunculate, and disposed in com- 

 pact or rather loose cymes. The divisions of the calyx are very 

 unequal, ovate, or roundish, obtuse, rarely with a little point, 

 covering only the lower half of the tube. The tube itself is 

 perfectly cylindrical in the young flower ; but afterwards swells 

 by the enlargement of the ovary, and becomes somewhat urceo- 

 late. The lobes of the corolla are ovate, obtuse, somewhat auri- 

 cled at the base, and campanulate or spreading, half as long as 

 the tube, but longer than the stamina. The corolla is membra- 

 naceous, not fleshy. The flowers are mostly 5-parted ; but the 

 latest ones of the season are often 4-parted, or even 3-parted. 

 The ripe capsule separates easily from the calyx, apparently with- 

 out bursting. 



3. CUSCUTA CORYLI, 71. Sp. 



Stem branching ; flowers peduncled, subumbellate, mostly 

 4-parted ; tube of the corolla cylindric, equal in length to the 

 ovate acutish crenulate inflexed lobes, and the acute carinate seg- 

 ments of the calyx ; stamens a little shorter than the limb ; the 

 scales appressed, bifid, consisting of few teeth ; styles as long as 

 the ovary with the stylopodium ; capsule depressed, covered with 

 the regiains of the corolla, crowned by the stylopodium and the 

 reflexed styles. 



Var. §. STYLOSA : styles much longer than the ovary, exserted. 



On Corylus, in the barrens west of St. Louis, in August and 

 September. §. On Solidago, in dry prairies near St. Louis. 



This species is nearly related to the foregoing, but may be ea- 

 sily distinguished by the shape and proportions of the calyx and 

 corolla, and by the stylopodium on the ovary. The corolla is 



Vol. xLiii, No. 2— July-Sept. 1842. 43 



