1919] Flora of the Boston District, — XXXI 127 
STAPHYLEACEAE. 
STAPHYLEA. 
S. trifolia L. Needham (7. O. Fuller, June 4, 1885; E. & C. E. 
Faxon, Aug. 16, 1891); “in woods at Weston," Bigelow, FI. Bost. 121, 
1824. 
ACERACEAE. 
ACER. 
A. NEGUvNDO L. Introduced from further west and frequently 
spreading. 
A. pennsylvanicum L. Cold rich woods; frequent in Essex 
County; also at Medford, Concord, Groton, and Blue Hill Reserva- 
tion. 
A. PLATANOIDES L. A rare escape from cultivation. 
A Pskupo-PLATANUS L. Casual escape at W. Medford and Dor- 
chester. 
A. rubrum L. Swamps and wet woods, very common throughout. 
A. rubrum L., var. tridens Wood. One tree near Auburndale 
(M. L. Fernald & A. Rehder, May 17, 1904). See RHODORA ix. 
116, 1907. Probably elsewhere in the district. 
A. saccharinum L. Occasional by streams, especially in Essex 
County; introduced in many places. 
A. saccharum Marsh. Rich woods; occasional in northern half 
of district and at Blue Hill Reservation and Hingham. 
A. spicatum Lam. Newburyport (Edw. Moulton, no date). 
Specimen in herb. Peabody Acad. of Science. i 
SAPINDACEAE. 
AESCULUS. 
A. Hippocastanum L. Rarely spontaneous. 
CARDIOSPERMUM. 
C. Hauicacasum L. Somerville (C. E. Perkins, September, 1878). 
Specimen in herb. N. E. Botanical Club. 
