1918] Report on the Flora of the Boston District,— XXVII 57 
P. pennsylvanica L. f. Copses and dry woods, common through- 
out. 
P. Persica (L.) Stokes. Spontaneous seedlings at South Boston, 
Dedham, Blue Hills and Hingham; probably elsewhere. 
P. serotina Ehrh. Dry p woods and roadsides, very common 
througħout. 
P. virginiana L. Pio of thickets and open woods, common 
throughout. 
PYRUS 
P. americana (Marsh.) DC. Moist woods, Essex County, from 
Wm. Oakes’s time to the present, rare. 
P. arbutifolia (L.) L. f. Thicket west side of Stetson Pond, Pem- 
broke (M. L. Fernald, October 29, 1916). Specimen in herb. N. E. 
Botanical Club. 
P. arbutifolia (L.) L. f., var. atropurpurea (Britton) Robinson. 
Swamps and low woods, common throughout. 
P. Auvcuparia (L.) Ehrh. Thickets and old fields, PEE 
P. BaccaTa L. Woods, S. Natick (J. R. Churchill, Aug. 29, 1908). 
P. communis L. Woods and thickets, occasional. 
P. Matus L. Pastures and thickets, frequent throughout. 
P. melanocarpa (Michx.) Willd. Wet meadows, also ledgy up- 
land, very common throughout. 
P. Avcupartra L. X melanocarpa (Michx.) Willd. Ipswich 
(W. P. Alcott, May 26, 1908); Pigeon Cove woods, Rockport (Miss 
M. E. Carter, October, 1905); moist meadow, Andover (A. S. Pease, 
July 10, 1902); escape, Hillside St., Milton (J. R. Churchill, Sept. 18, 
1887). 
ROSA. 
R. cantina L. Roadside, Prospect Hill, Andover (A. S. Pease, June 
28, 1904); a single bush on “ made land,” Westland Ave., Boston 
(C. W. Swan, June 19, 1885); Center St., Jamaica Plain (E. & C. E. 
Faxon, July 1, 1888). 
R. carolina L. Swamps and wet places, common. 
R. cINNAMOMEA L. Persistent around old places, occasional. 
R. cauuica L. Escaped and well established at Andover and 
Canton, probably elsewhere. 
