51 
Fig. 6—C. arvense, L., var. oblongifolium, from Staten 
Island. 
Fig. 7.—C. arvense, L., var. angustifolium, Fenzl. Drawn 
from specimen in Dr. Gray’s herbarium, collected in 
Oregon by Geyer. 
Fig. 8.—C. arvense, L., var. villosum. From specimen 
collected by Prof. T. C. Porter, in Lancaster county, 
Penn. 
All the figures on Plates LXIv. and LXv. were drawn from 
herbarium specimens. 
Some New or Little Known American Plants. 
By THOMAS MoRONG. 
ERYNGIUM LUDOVICIANUM. A new species belonging to 
Chapman’s scaly fruited section is sent by Rev. A. B. Langlois, 
from Natchitoches county, Louisiana. 
Stem slender, erect, about 18 inches high, diffusely branch- 
ing; leaves few, the lower oblong, irregularly serrate or incised, 
_ the teeth and apex spinescent, 3 to 5 lines wide and 1 to 2 inches 
long, tapering into a winged petiole which broadens into a clasp- 
ing base, the uppermost linear, more deeply laciniate, often three- 
cleft; involucral leaflets six to eight, rigid, entire or dentate 
towards the base, twice as long as the heads, recurved or reflexed ; 
inflorescence cymose, the whitish heads hemispherical, 2 to 3 
lines in diameter, on slender peduncles % to 1 inch in length; 
flowers small, light blue; bracts tricuspidate, longer than the 
flowers; fruit scaly. 
This plant grows in sandy barrens, and may be easily distin- 
guished from £. Baldwinit, Spreng., and £. prostratum, Nutt., 
with which it occurs, and with which it might be confounded, by 
its erect habit, its tricuspidate bracts and scaly fruit. 
MYRIOPHYLLUM ALTERNIFLORUM, DC. This species, hith- 
erto reported no nearer to us than Greenland, was detected last 
August by Mr. J. R. Churchill at Sargent’s Bay, Lake Mem- 
phremagog, Canada. It is somewhat like 7. spicatum in appear- 
ance, but with much more slender stems and shorter leaves ; spikes 
quite slender and only 1 to 1% inches long; the pistillate floral 
