The ferns and flowering plants of Nantucket—xXI 
EUGENE P. BICKNELL 
CELASTRACEAE 
*CELASTRUS SCANDENS L. 
Rare; it is found sparingly on Coskaty entwined with wild 
rose and red raspberry near the harbor shore, and in Shawkemo, 
where it is massed thickly along a low bank back of the beach. 
Flower buds June 4, 1909; first flowers June 2, I9II. 
ACERACEAE 
ACER RUBRUM L. 
In swamps and low grounds. It is commonly of no greater 
stature than a shrub, but in sheltered thickets becomes a well- 
developed tree, and in Beechwood has attained a height of not 
less than thirty to thirty-five feet, the trunks thirty to thirty-five 
inches in basal girth. The leaves of different trees are widely vari- 
able, sometimes appearing much like those of Acer carolinianum, 
again taking an elongated form with narrowly cleft attenuate and 
sharply cut lobes. 
*ACER CAROLINIANUM Walter. 
Frequent in boggy thickets, sometimes side by side with those 
forms of Acer rubrum with which it is most sharply in contrast. 
It is a tree of marked individuality when appointed in its true 
features but these are not always well expressed and its divergence 
from the red maple cannot be said to have passed into a fixed 
separation. In its most characteristic forms the small thickish 
leaves, rather clustered at the ends of the branchlets, are of 
rounded outline and broadly notched into three short lobes, the 
blades, only 4-6 cm. long and wide, having the upper surface of a 
dark shining green, the lower surface peeroruuely whitened and 
more or less pubescent. 
605 
