25G PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
1914, 1 should be inclined to refer to var. crassifolia (Lam.) Gray, as at 
least one of the branchlets has the leaves distinctly scabrate above, 
but as it has no fruits, it may be from a young plant which like vigorous 
shoots has rougher und more pubescent leaves." 
HUMULUS. IIoi'. 
H. LuPULUS L. Hop. — Occasional in low ground or on rocky 
banks; an escape from cultivation. 
LAPORTEA. Wood Nettle. 
L. canadensis (L.) Gaud. Wood Nettle. — {Urticasfrum di- 
varicatwn 111. Fl. ed. 2.) 
Rich woods; common in the valleys, frequent on the plateau. 
Altitude on the plateau, 1800 feet, Adams; 2500 feet, Greylock. 
MORUS. Mulberry. 
M. ALBA L. ^YHITE MuLBERRY. — An occasional escape from culti- 
vation; New Marlboro; Sheffield. 
M. rubra L. Red Mulberry. — A single tree on a limestone ledge 
in New Marlboro; two trees on a limestone cobble in Ashley Falls, 
Sheffield. The only known stations for this western tree in the State. 
PARIETARIA. Pellitory. 
P. pennsylvanica Muhl. Pellitory. — Shaded limestone rocks, 
Sheffield (Walters); shaded limestone ledge, New Marlboro. 
PILE A. Richweed; Clearweed. 
P. pumila (L.) Gray. Richweed; Clearweed. — ■ Damp shaded 
ground, shaded ledges and waste ground; common. 
ULMUS. Elm. 
U. americana L. American or White Elm. — Along streams and 
in rich woods; common, except on the plateau, where rare. 
U. campestris L. English Elm. — Seedlings growing under shade 
trees in Lenox. 
[^ U. fulva Miclix. Slippery Elm. — Rocky woods and along 
streams ; frequent in the valley. Not noted on the plateau. 
