BICKNELL : FERNS AND FLOWERING PLANTS OF NANTUCKET 63 
The Japanese Berberis Thunbergit DC. was twice observed in 
waste places near the town. 
LAURACEAE 
SASSAFRAS SASSAFRAS (L.) Karst. 
Common in thickets, sometimes flowering when only three to 
four feet high. It is not often seen over ten feet in height, the 
largest trees occurring in Polpis and on Coskaty. First flowers 
June 4, 1909. 
PAPAVERACEAE 
CHELIDONIUM Majus L, 
Almost confined to the town where it is common as a street- 
side and garden weed; occasional in waste ground at outlying 
points. In full flower May 30, 1909; in some seasons flowers 
are to be found up to the middle of September. 
CRUCIFERAE 
* LEPIDIUM CAMPESTRE (L.) R. Br. 
A recently introduced weed first observed in 1908 —a single 
plant by the wharves and a small group in a farm yard west of 
head of Hummock Pond; in flower and fruit June 10. In June 
of the following year two plants were seen on the wharves and a 
single plant by a roadside in Polpis. 
LEPIDIUM VIRGINICUM L. 
A very common weed, sometimes flowering casually before the 
middle of June, but not generally in bloom until later in the month, 
Forms occur with densely pubescent leaves, others with the lower 
leaves pinnate with pinnatifid segments, these variations answering 
to the characters adduced for the so-called varieties pubescens 
Schmitz and pennatifidum Schultz. 
* LEPIDIUM DENSIFLORUM Schrad. 
L. intermedium A, Gray. Not A. Rich. 
L. apetalum Asch. and auct. Am. Not Willd. fde Thellung. 
Apparently of only recent appearance on Nantucket ; first 
observed in September, 1904 — two street-side plants in the town 
and a small groupin waste ground at Siasconset. It was not seen 
at all in 1906 and 1907. In June, 1908, it was noticed once in 
