610 BiIcKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 
observed west of Maxcy’s and Hummock Ponds. Plants of full 
size June 15, 1911; small flower buds June 11, 1912; in full flower 
and with some mature pods Aug. 16,1906. So far as observed, the 
Nantucket plant has always sessile broadly clasping leaves. 
*HYPERICUM BOREALE (Britton) Bicknell. 
This is the commonest Hypericum of the island, abounding in 
low grounds, damp or wet sandy places, and pond shores. It is 
sometimes aquatic, inhabiting deep water with the habit of a 
Callitriche, the elongated leafy stems either wholly submerged or 
their tips emersed. In wet sand it may become strongly stolonif- 
erous, putting forth prostrate basal offshoots which reach a length 
of several inches and root at intervals, sending up small flowering 
stems and terminating in a cluster of stems from the rooted tip. 
The young plants become recognizable early in June. Just in 
flower Aug. 13, 1906, remaining in bloom through September. 
HYPERICUM MUTILUM L. ; 
Common in low grounds, often with its characters unusually 
well emphasized, the broadly clasping leaves becoming as large 
as 3 cm. long by 2 cm. wide. The earliest leaves are observable 
at the end of May and the young plants take definite form early 
in June. In full flower Aug. 13, 1906; flowering through 
September. 
*HyPERICUM MAjus (A. Gray) Britton. 
Infrequent, growing in damp places. West and southwest of 
the town; Trot’s Swamp; Miacomet Pond; Quaise. Just in flower 
Aug. II, 1906; in full flower Sept. 8, 1904; Sept. 12, 1907. 
HYPERICUM CANADENSE L., 
Common in low grounds and wet sandy places. Leaves often 
almost filiform linear. Plants very small May 30, 1909; a single 
early flower June 20, 1908, and July 3, 1912; in full flower and 
with mature capsules Aug. 13, 1906; continues in flower through 
September. 
*Hypericum dissimulatum sp. nov. 
Erect, often from an oblique or horizontal rooting base, 
commonly 1.5-3 dm. high, exceptionally up to 5.5 dm., not often 
