1913] Reports on the Flora of the Boston District,— XVI 57 
P. dichotomum L. Woods, usually in dry soil, common through- 
out. 
P. heterophyllum Bosc. (P. columbianum Scribn; see Hubbard, 
Ruopona xiv. 171-2, 1912)... Dry sandy soil, sometimes in rich open 
woods; occasional from Holbrook, Canton, Milton, Westwood, New- 
ton, Wellesley and Framingham northeastward. 
P. heterophyllum Bosc, var. thinium (Hitche. & Chase) Hubbard 
(P. columbianum Scribn., var. thinium Hitche. € Chase; see Hubbard, 
Ruopora xiv. 172, 1912). Winchester (C. E. Perkins, Sept. 1, 1882); 
sandy hillside, Manchester (F. T. Hubbard, Oct. 1, 1912). 
P. huachucae Ashe. Dry soil, eight stations in central part of 
district. 
P. huachucae Ashe, var. fasciculatum (Torr.) Hubbard (var. 
silvicola Hitche. € Chase; see Hubbard, Ruopona, xiv. 171, 1912). 
In moister soil than the typical form, often in woods; common from 
North Scituate, Canton and Norwood northward, probably through- 
out. 
P. implicatum Scribn. Dry and moist soil, common. 
P. languidum Hitche. & Chase. North side of Prospect Hill on 
new road, Waltham (E. F. Williams, Oct. 6, 1895). Mr. F. Tracy 
Hubbard published in Ruopora xiv. 37, 1912, P. languidum, no. 205, 
from West Gloucester, specimens having been submitted to Mrs. Chase 
at Washington. Since then Mrs. Chase has decided that the plant 
is P. tennesseense Ashe. 
P. latifolium L. Sandy and rocky soil, usually in open woods; 
frequent in northern and central portions, apparently rare southward. 
P. Lindheimeri Nash. Dry soil, rare or local; Manchester, South 
Boston, West Roxbury, Canton Junction, Wellesley, Framingham. 
P. linearifolium Scribn. Dry soil, mostly in woods; occasional, 
especially in central section. 
P. lucidum Ashe. Rich woods, rare; Manchester, Melrose, 
Quincy, Framingham. 
P. macrocarpon Torr. (P. Seribnerianum Nash; see Hubbard, 
Ruopora xiv. 184, 1912). Dry sand and gravel; common in most 
of the district, but not reported from the extreme south. 
[P. mattamuskeetense Ashe. 'The plant reported under this name 
in Ruoponma ii. 114, 1901, proves to be P. commutatum Schultes 
according to Mrs. Chase in litt.] 
P. meridionale Ashe. Rich open woods; Beverly Farms, one 
