‘IRbodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 13. March, 1911. No. 147. 
A NEW ARABIS. 
E. B. HARGER. 
In the spring of 1907 I found an Arabis, which was not familiar to 
me. It was growing on a trap ridge in Southbury, Connecticut, and 
from its habit as well as its erect young pods I took it at first to be 
A. Drummondi Gray, but was puzzled by some unusual features. 
Later collections showed the pods spreading or recurving, with seeds 
similar to those of A. laevigata (Muhl.) Poir. I soon learned from 
Dr. E. H. Eames that he had collected the vernal state of the same 
plant in a similar situation in the adjoining town of Woodbury and 
that he also had taken it for A. Drummondi. Then Mr. C. A. 
Weatherby reported collecting at Bolton, Connecticut, further speci- 
mens of the same form which, on comparison at the Gray Herbarium, 
he found to match material there included under A. laevigata. 
I continued to observe my plant only to be more and more con- 
vinced that it was distinct from what I had known as Arabis laevigata, 
and a visit to the Gray Herbarium showed that the two forms were 
well represented there and were separated by marked and constant 
characters. 
The new plant is bright green and very leafy, averaging in the 
specimens examined 28 internodes to the first flower. Some or 
usually all of the lower leaves are deeply lyrate-pinnatifid and the 
flowers are white with conspicuous petals and on erect pedicels. 
Arabis laevigata is less leafy, averaging 13 internodes to the first 
flower, is strongly glaucous and very rarely has any pinnatifid lower 
leaves. Its flowers are borne on diverging pedicels and the petals 
scarcely exceed the calyx. One of the most marked differences 
between the two plants, and one which appears to be constant, is 
