424 BICKNELL: FERNS AND 
Included among the introduced plants are some thirty species 
common in cultivation which, although not to be taken as es- 
tablished, have been found persisting in a wild state. The tend- 
ency shown by these plants to stray away from their home gardens 
may well thus be put on record. Should any of them in time come 
to take a wider place in the flora the beginning of their history 
as wild plants would become a matter of interest. 
Nearly one half of the introduced species are well naturalized 
and more than two-thirds of these are widespread, including in 
their number many of the island’s abundant plants. About sev- 
enty-five species may be accounted common, forty as frequent, 
seventy as of occasional occurrence. 
Almost everywhere where introduced plants abound a much 
larger proportion of their species than those of the native plants 
are confined to a single station or to a very few places, and this 
is notably the case on Nantucket, notwithstanding that an unusual 
number of native plants are there thus localized. One hundred 
and seventy of Nantucket’s introduced plants have been found 
at not more than two or three localities, eighty of them at a single 
station only. 
The town of Nantucket itself with its old gardens, its resting 
wharves, its streetsides and habitable places for plants that have 
had a quiet past, has come into a flora very interestingly its own, 

are sometimes deep purple, a character hitherto regarded as diagnostic of B. iodan- 
dra. ome examples, as already intimated, seem to pass into more typical forms of 
B. paniculata, and appear to be similar to the Massachusetts plant reported and 
figured as B. iodandra by Williams (Rhodora 2: 55-57. pl. 15, f. 5. 1900), now re- 
garded, I understand, as B. paniculata. Professor Robinson who, with Professor 
Fernald, has recently examined my Nantucket specimens advises me that they are 
not B. ioandra, and specimens of the nae from Newfoundland which were kindly 
sent to me, show a plant very unlike anything I have net wt ith on Nantucket and 
beyond question, as I now see it, a strikingly distinct species. 
I am indebted to Miss Albertson for Sen of the eile additions to the list, 
one native and three introduced species, as follow 
STEIRONEMA LANCEOLATUM (Walt.) A. eae Monomoy, August 22, 1918, in 
man 
HUS MAXIMILIANI Schrad. Field i in Madequet, August 15,1919. Col- 
lected in full flower by Miss Ober. 
CENTAUREA JACEAL. Field near Franklin Fountain, August, 1915, and July. 
1918. 
CENTAUREA MACULOSA Lam. Near Big Mioxes, August 23, 1919. Collected 
in full flower by Miss Milne. 
