86 FLORA OF MOUNT DESERT. ELATINACEÆ. WATERWORT FAMILY. ELATINE, L. WATERWORT. 72 E. Americana (Pursh), Arn. Rare. Margin of Somes Stream and of Mill Pond, Somesville (Rand, M. L. Fernald). HYPERICACEÆ. ST. JOHN'S-WORT FAMILY. HYPERICUM, L. ST. JOHN'S-WORT. 73 *H. adpressum, Bart. Rare. Adventive from farther south. Along the railroad, Green Mountain (Arnold Greene). 74 H. ellipticum, Hook. Wet places and bogs; frequent. Pond Heath; Northeast C.B. Harbor; Southwest Harbor; High Head, etc. (Rand); — Somes- ville (R. & R.); — Squid Cove (Redfield). 75 H. PERFORATUM, L. COMMON ST. JOHN'S-WORT. Fields and roadsides; frequent in some parts of the Island. B.RdL.Q.S. A well known weed. Naturalized from Europe. X. 76 H. mutilum, L. Frequent in low grounds and wet places. Outlet of Great Pond; Southwest Harbor; Somesville, etc. (Rand); — shores of Great Pond (Redfield). 77 H. Canadense, L. Common in wet, sandy soil. C.S.K.Sqj 78 Var. majus, Gray. Frequent. Southwest Harbor; Northeast Harbor; Denning Brook; Long Pond meadows; Somesville; shores of Jordan Pond and Great Pond; Bass Harbor, etc. (Rand); — Seal Har- bor; Little Cranberry Isle (Redfield). Two somewhat peculiar forms of this variety are sometimes met with on the Island: —