256 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



1914, 1 should be inclined to refer to var. crassifolia (Larn.) 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 and more pubescent leaves." 



HUMULUS. Hop. 



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. — {Urticastrum di- 

 varicatum 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. White Mulbekry. — 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. 



PILEA. 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 Michx. Slippery Elm. — Rocky woods and along 

 streams; frequent in the valley. Not noted on the plateau. 



