Monograpliy of the North American Cuscutinece. 337 
the ovate obtuse lobes of the calyx ; stamens shorter than the 
limb ; the scales ovate, Iaciniate,_ nearly appressed ; styles equal 
to the depressed ovary ; capsule depressed, covered by the re¬ 
mains of the corolla. 
' On Cephalanthus; also on Vernonia, Aster, Boshmeria, and 
other plants, (especially Composite,) on the margin of ponds and 
swamps near St. Louis, where it is the most common species. 
I have observed it since l^p3; 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 gf the corolla are ovate, obtuse, somewhat auri- 
' cied 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 6-pa*ted; but the 
latest, #ies. of. the season are often 4-parted, or even 3-parted* 
The rifte c&psule separates easily from the calyx, apparently with¬ 
out bursting. 
2. ClJSCUTA CORYLI, U. 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 remains of the corolla, crowned by the stylopodium and the 
reflexed styles. 
Tar. ft. stylosa: styles much longer than thr ovary, exserted. 
v On Corylus, in the barrens west of St. Louis, in August and 
September, ft. 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 
