BICKNELL; FERNS AND FLOWERING PLANTS OF NANTUCKET 453 
cluster, perfectly typical, in a dry pine grove on the Surfside road. 
First flowers May 30,1909. Petals sometimes rose color in drying. 
AMELANCHIER CANADENSIS (L.) Medic. 
Thickets and banks, mainly on the eastern side of the island; 
pine barrens east of Hummock Pond, some flowers as late as June 
12, 1909. The largest examples, found at Beechwood and in 
Quaise, were 15-20 inches in circumference and were estimated to 
be twenty to twenty-five feet in height, their leaves becoming as 
large as 11 cm. long by 6 cm. wide, many of them deeply cordate. 
One of the stoutest examples of the species I have ever seen 
was met with on Tuckernuck, June 17, 1911; although not more 
than twenty feet tall it measured forty-two inches around near 
the base, and thirty inches around above the first fork of the trunk, 
It was unexpected to find thriving on Nantucket a tree having 
elsewhere so strong a bent for wooded hillsides and rocky sur- 
roundings. Here the absence of such conditions has forced it 
occasionally into low thickets in association with Amelanchier 
oblongifolia; and, growing with the typical forms, there occur 
others difficult to assign as between one and the other of these 
Juneberries. With two so closely related species placed in asso- 
ciation, intercrossing might well be expected, and these interme- 
diate forms are perhaps thus to be explained. 
*AMELANCHIER OBLONGIFOLIA (T. & G.) Roem. 
Common in low thickets. Full racemes of flowers as late as 
June 3, 1909; other individuals out of bloom and bearing green 
fruit by May 30. Petals 8-14 mm. long by 2.5-4 mm. wide. 
The largest tree observed was in a wet thicket in Pocomo and 
measured twenty-three inches in circumference about a foot above 
the base. 
*Amelanchier nantucketense sp. nov. 
An erect, at length compactly much branched and very leafy 
shrub 1.5 dm. to 2 m. high, the bark of the younger parts purplish 
brown becoming dark gray; leaves often crowded, firm, thickened 
at maturity, dark bluish green on the upper surface with a sub- 
glaucous bloom, at length shining, pale beneath, especially at full 
maturity, those of the woody branches commonly small, often 
only 2-3 cm. long and 1.5-2 cm. wide, oval or elliptic and abruptly 
rounded at each end, or broadened above and more or less cuneate 
