204 Rhodora [NovEMBER 
REPORTS [ОХ THE FLORA OF THE BOSTON 
DISTRICT,—V. 
In preparing this list, it seemed to the committee that records of 
early collections would add to its value and interest, even where the 
species are common ones. Accordingly all existing specimens col- 
lected before 1860 have been mentioned. 
There has been very little done in collecting Potamogetons within 
recent years. Fresh Pond, Cambridge, and Mystic Pond, in Medford 
and Winchester, have been changed so much that the stations formerly 
reported there are probably in many cases extinct. The ponds in 
Wenham should be revisited, however, and there is no reason why 
other sheets of water favorably located, should not also be productive. 
TYPHACEAE. 
TYPHA. 
T. angustifolia L. Swamps and salt-marshes near the coast. 
Swampscott (Aug. 18, 1902, comm. Susan Minns). Abundant locally 
near Boston. 
T. latifolia L. Swamps, abundant throughout. 
Where the two species grow together there are all kinds of inter- 
mediate forms. ‘This is especially noticeable in the big swamps at 
West Cambridge. 
SPARGANIACEAE. 
SPARGANIUM. 
S. americanum Nutt. Muddy bottoms of streams and ponds in 
shallow water; fairly well distributed throughout. 
S. americanum Nutt., var. androcladum (Engelm.) Fernald & 
Eames. Growing with the type; very abundant. There are two 
specimens of this variety in the Gray Herb., collected respectively at 
Beverly in 1856, and in Fresh Pond, Cambridge in 1857 by Asa Gray. 
S. angustifolium Michx. Spot Pond [Middlesex Fells] (Wm. 
Boott, Aug. 20, 1865. Specimen in Gray Herb.); Crane Pond, West 
