1910] Flora of the Boston District,— VII 97 
J. effusus L., var. solutus Fernald & Wiegand. Low ground, 
meadows, marshes, and shores of ponds and streams. Reported from 
many stations throughout the district except in the extreme northern, 
western and southern portions, where it is doubtless common. It 
was collected by Wm. Boott in ‘‘upland, wet meadow,” Winchester, 
July 5, 1853. This is our common form. 
J. filiformis L. Shore of Merrimac River, Lawrence (44. S. Pease, 
June 10, 1903); ‘‘Concord (E. S. Hoar; specimen in herb. of) " accord- 
ing to Dame & Collins, Fl. Middlesex Co. 109 (1888). 
J. Gerardi Loisel. Salt marshes; common. As reports show its 
abundance along the Charles River as far up as East Watertown, it 
will be interesting to note how long this species persists under the 
changed conditions caused by the Charles River Dam. Fresh water 
and a permanent level will have no little effect on the halophytes which 
have heretofore flourished along this estuary. Specimens were col- 
lected by Wm. Oakes, Ipswich, 1833; John A. Lowell, Beverly, 
July 16, 1846; Cambridge, June 16, 1546; Wm. Boott, Edgeworth 
[Malden] July 9 and July 19, 1853; Medford, June 20, 1858. 
J. Greenei Oakes & Tuckerm. In barren, generally dry soil, 
common. 
In the Gray Herbarium are two sheets collected by Wm. Oakes, 
“in arenosis siccis ad Ipswich." To one of these is attached the 
following autograph letter from the collector: “For Dr. Gray. This 
is probably a new species, and not fit to distribute. I should not dis- 
dain to stand godfather to it myself. This I suppose was first found 
by me as early as 1825, perhaps some years earlier. I showed it to 
Tuckerman at Plymouth in 1839, who sent specimens to ‘Torrey, and 
I sent abundant specimens in flower and in fruit to ‘Torrey & Gray 
this spring.— Sand, Ipswich, Mass." 
The plant was finally published by Oakes & Tuckerman (Am. 
Jour. Sci., xlv. 37 (1843)). It was named for Mr. Benjamin D. 
Greene, the first President of the Boston Society of Natural History. 
J. marginatus Rostk. Damp ground, common throughout. Col- 
lected in Danvers by John A. Lowell in August, 1849, and at Chelsea 
Beach Island [Revere] by Wm. Boott, Sept. 10, 1855. 
J. militaris Bigel. Margins of ponds and streams; well distributed, 
but rather local. Collected by John A. Lowell in Wenham, July, 1547. 
Round Pond, Tewksbury, is the type station for this species, as it 
was discovered there by Mr. B. D. Greene. Dr. Jacob Bigelow 
