219 
_ New or Noteworthy North American Phanerogams.—VI, 
By N. L. Britton. 
Ranunculus arvensis, L., which has been noticed on ballast 
about the eastern seaports for many years appears to be spread- 
ing. It was found by Mr. Wm. H. Rudkin at Tom’s River, N. 
J., in 1884, and now Mr. Geo. V. Nash sends it from the vicinity 
of Clifton, Passaic Co., N. J. 
Cardamine Pennsylvanica, Muhl. in Willd. Sp. Pl. iii. 486 
(1800). 
It has been a frequent topic of remark among American bot- 
anists that our Cardamine hirsuta is a glabrous plant. I have 
been interested for several years in accumulating a large number of 
specimens of the forms which have been referred to C. hirsuta 
and am convinced that the typical plant is rare in America, 
as is indicated in the sixth edition of Gray’s Manual. Our com- 
mon marsh and ditch plant differs from C. Airsu¢a inbeing glabrous 
or rarely with a few hairs onthe petioles or leaf-margins, while all 
the European specimens of this species that I have seen are more or 
less pubescent on the stems, the upper surface of the leaf-seg- 
ments or the petioles. C. Pennsylvanica is much larger and more 
leafy, being often two feet high; the leaves of Airsuta being 
mainly radical; the leaf-segments of Pennsylvanica are larger, 
More generally oblong or ovate, narrowed rather than rounded 
at the base, as is the case with those of /érsuéa, and have a de- 
cided tendency to be decurrent on the rachis, while those of the 
European plant are nearly uniformly distinct and stalked ; the 
leaf-segments of Pennsylvanica are also thinner and more lobed 
than those of hirsuta; the fruiting pedicels of Pennsylvanica are 
always somewhat spreading and sometimes conspicuously s0, 
while those of hirsuta are nearly or quite erect and the pods 
a}. pressed, 
Thave but a single specimen of true C. /irsufa from North 
America, collected by John K. Small, May 2, 1891. along the 
Susquehanna River, north of Wrightsville, York County, Fenn. 
€ question of its distribution will be an interesting one. Is it 
Northern or Alleghenian ? Or perhaps introduced from Europe ? 
