14 Rhodora [JANUARY 
G. BOREALE L. Mowing-field by brook, Woburn (C. H. Knowlton, 
July 4, 1906); Needham (Miss Gertrude Morton, July 7, 1879, July 
1, 1881). 
G. circaezans Michx. Dry open woods and hillsides, common. 
G. Claytoni Michx. Swamps and wet meadows, common. 
G. ERECTUM Huds. Georgetown near Pentucket Pond (J. H. Sears, 
June 12, Aug. 9, 1905); Oak Island, Revere (H. A. Purdie, June 2, 
1895, others later); E. Somerville (C. E. Perkins, June 25, 1879). 
G. lanceolatum Torr. Dry woods, occasionally in moist soil; 
apparently common, but no reports from southern towns. 
G. Morrvco L. Fields and roadsides, rare; Andover, Danvers, 
Somerville, Boston, Newton, Needham, Natick, W. Bridgewater. 
G. palustre L Swamps and wet places, frequent. 
G. pilosum Ait. Dry soil; well distributed and frequent, but only 
three stations in Essex county. 
G. svLvATICUM L. N. Andover (A. S. Pease, Sept. 14, 1901); 
Wellesley Hills, (H. A. Purdie, July 18, 1897). Specimens in herb. 
N. E. Botanical Club. 
G. tinctorium L. Moist soil, common. 
G. trifidum L. Forming prostrate mats on floating debris, margin 
of Pilling Pond, Lynnfield (M. L. Fernald, Oct. 21, 1917); marshy 
margin of Lake Waban, Wellesley (F. W. Hunnewell, Aug. 24, 1912). 
G. triflorum Michx. Woods and glades, common. 
G. veruM L. Dry fields and open woods; occasional at Danvers, 
Arlington, Natick, Lincoln, Dorchester; abundant in Norfolk county 
from Hyde Park and Dedham south to Norfolk and Medfield. 
HOUSTONIA. 
H. caerulea L. Fields, very common throughout. 
H. lanceolata (Poir.) Britton. Dry sandy pasture, Newburyport 
(Wm. Wendte, June 30, 1898); dry soil, Sherborn (Miss M. L. Loomis, 
June 20, 1911). Specimens in herb. Gray, and Boston Soc. Nat. 
Hist. 
H. longifolia Gaertn. Dry ledges and hillsides around Boston and 
suburbs, and the Blue Hill Reservation; also at Groveland, Boxford, 
Marlboro, Braintree, Sharon, Medfield and Wrentham. 
MITCHELLA. 
M. repens L. Woods, common. White-fruited form collected in 
Middleton and Concord. 
