1918] Reports on the Flora of the Boston District,— XXVII 55 
REPORTS ON THE FLORA OF THE BOSTON 
DISTRICT,—XXVII. 
POTENTILLA. 
P. AnsERINA L. Made land, South Boston (C. E. Perkins, June —, 
1882). Specimen in herb. N. E. Botanical Club. A waif in this 
region, being a native of western North America from Mexico north- 
wards, also of Eurasia. 
P. argentea L. Dry sunny places, very common throughout. 
P. arguta Pursh. Rocky soil in woods and pastures, occasional 
from Blue Hills northward. 
P. canadensis L. Dry soil, common throughout. 
P. canadensis L., var. simplex (Michx.) T. & G. As common as 
the typical form and not easily distinguishable from it after flowering. 
P. fruticosa L. Swamps (in our territory). Reported as abun- 
dant at Ipswich, Essex, Rockport, Lynnfield and Groton; scattered 
bushes at twelve other stations from Norfolk north and northeast. 
P. INTERMEDIA L. Roadside, Cambridge (M. L. Fernald, June 15, 
1891.) 
P. monspeliensis L. Dry sunny places, common throughout. 
P. monspeliensis L., var. Norvecica (L.) Rydb. Introduced in 
waste places; Manchester, Beverly, Boston, South Boston, Scituate. 
P. pacifica Howell. See Ruopora xi. 1-9, 1909. Salt marshes, 
common all along the coast. 
P. palustris (L.) Scop. Swamps and ditches, occasional from 
Canton and Needham northward. 
P. palustris (L.) Scop., f. subsericea (Becker) Wolf. Dedham 
(S. Harris, June 13, 1897). Specimen in herb. N. E. Botanical Club. 
For discussion of this form see Fernald & Wiegand, RHopora xii. 
111, 140, 1910; S. F. Blake, ibid. xv. 165-166, 1913; Fernald & 
Long, ibid. xvi. 10, 1914. 
` P. palustris (L.) Scop., var. villosa (Pers.) Lehm. See RHODORA 
xi. 48, 1909 and xvi. 10, 1914. Dedham (J. R. Churchill, July 18, 
1891); Millpond on Charles River, South Natick (K. M. Wiegand 
& Margaret Heatley, June 30, 1908). Specimen in herb. Wellesley 
College. 
P. pumila Poir. Dry fields and pastures, very common through- 
out. 
