1913] Reports on the Flora of the Boston District, — XVII 127 
GASTRIDIUM. 
G. AUSTRALE Beauv. In wool waste, Lowell and Billerica (C. W. 
Swan, July 24, 1883); S. Boston (C. E. Perkins, July 20, 1882). 
A native of Europe, but probably adventive here from California, 
where it is naturalized (Dame & Collins, Fl. Middlesex Co. 127, 1888). 
POLYPOGON. 
P. MONSPELIENSIS (L.) Desf. Waste places, rare; North Chelms- 
ford, Lowell, Dracut, Billerica, Charlestown, Boston, South Boston. 
CALAMAGROSTIS. 
C. canadensis (Michx.) Beauv. Swamps and wet places, common 
throughout. A peculiar form of this species collected in Boxford, 
August 6, 1899, by E. F. Williams was sent to Mrs. Chase and has 
been returned by her with the following note, dated April 23, 1913; 
“The loose panicle of long slender branches, and the long callus hairs 
indicate C. canadensis with which the specimen agrees perfectly except 
in having spikelets scarcely 2.5 mm. long. I do not find any speci- 
mens with spikelets quite so small as this, but there are a number 
with spikelets less than 3 mm. These are from Saskatchewan, Mon- 
tana, Wisconsin, and District of Columbia, showing no geographical 
limitation." 
C. cinnoides (Muhl.) Barton. Low thickets and borders of woods, 
never abundant; occasional in other parts of district, but not reported 
from west or southwest. 
C. Pickeringii Gray. Meadow north of Haggett's Pond, Andover 
(J. Robinson, June 26, 1878; June 27, 1879; June 26, 1880); swamps, 
Andover (J. H. Sears, September, 1880); meadows along Fish Brook, 
Andover (A. S. Pease, July 27, 1903; July 7, 1904); sandy bank, 
Wilmington (E. F. Williams, June 11, 1899). 
AMMOPHILA. 
A. arenaria (L.) Link. Sand-dunes and beaches along the coast, 
common. 
