14 Bicknell: Ferns and flowering plants of Nantucket 



Note 



* POPULUS candicans Ait. 



Established and spreading here and there, especially about the 

 sites of almost obliterated farms. On the border of Trot's Swamp 

 is a scattered group of trees of various ages, the largest about 

 twenty feet high and twenty-eight inches in girth a foot above the 

 base. 



PoPULUS GR ANDIDENTATA MicllX. 



Infrequent: Taupawshas Swamp ; Shawkemo ; boggy depres- 

 sions along the northern border of Saul's Hills ; Tom Never's 

 Swamp ; probably no trees seen over six or eight feet high. 



* POPULUS TREMULOIDES Michx. 



Occasional or frequent from the head of Long Pond across 

 the island to 'Sconset and Polpis ; small trees only. 



It should be recorded that a few small trees of Popubis 

 tremula L., of Europe, occur scattered among the pines near Mia- 

 comet Pond. It would be a natural inference that these were ac- 

 cidentally introduced when the European pines were planted. But, 

 if this be true, it is difficult to account for the small size and apparent 

 youth of the poplars, the pines having been planted over thirty years 

 ago. The largest of the poplars was less than ten feet high in 1907 

 and some were only a few feet tall. The same mystery attaches 

 to the presence among the pines of some young trees of the Norway 

 maple {Acer Psendo-platanns L.) and a single small American 

 chestnut \Casta7iea dentata (Marsh.) Borkh.] about ten feet in 

 height. Among these pines also are a few small hickories which 

 are certainly not native where they are established. A single 

 small tree of Popidiis iremida was also found among the pines on 

 the Surfside road which shelter as well scattered trees of the 

 white ash {Fraximis americana L.) and American elm {Ulnms 

 americana L.), which are not known ever to have occurred on the 

 island as native species. 



*Salix fragilis L. 



i 



Introduced willows are established on Nantucket here and 

 there along roadsides and meadows and about old farm lands. 

 As a rule they have shown little ability to spread and some of the 

 larger trees, of no great height in any case, which must have been 



