1922] Fernald, —Notes on Sparganium 31 
Newfoundland to Lake Mistassini and southward into the northern 
states. In New England it presents the same anomaly in distribution 
as S. angustifolium, occuring southward to Kennebec, Androscoggin 
and Oxford Cos., Maine, and Belknap Co., New Hampshire, but 
being unknown from southwesternMaine and southern New Hamp- 
shire, although found in lakes and ponds of Middlesex and Norfolk 
Cos., Massachusetts. Is it absent from southwestern Maine and 
southern New Hampshire? 
S. MINIMUM Fries. This circumpolar species shows a peculiarity 
of range in New England similar to those just discussed. Frequent in 
Maine (south to Androscoggin Co.) and Vermont, the species is quite 
unknown from New Hampshire except for an old specimen with indef- 
inite data, apparently collected at Meredith, Belknap Co., yet it 
occurs in Middlesex County, Massachusetts. Is S. minimum absent 
or essentially so from southwestern Maine and from New Hampshire? 
In view of the many changes in the treatment of Sparganium the 
following new key to the species occurring from New England and 
New York northward is offered and a statement of the ranges within 
this area appended. Specimens showing extension of range or diver- 
gence of the specific characters will be gratefully received. 
A. Stigmas 2, filiform: mature carpels sessile, broadly wedge- 
shaped or obpyramidal below, rounded, broadly conical 
or subtruncate above, 4-8 mm. thick: sepals nearly equal- 
ing the body of the Pru... un ee ENEE 1. S. eurycarpum. 
A. Stigma 1, linear to ovate: mature carpels about equally 
narrowed to summit and to the more or less stipitate base, 
1.2-3 mm. thick: sepals much shorter than to 24 as long 
as body of fruit. B. 
B. Staminate heads 2-20 (rarely only 1): fruiting heads 
1.2-3.5 em. in diameter: mature carpels strongly fusi- 
form, 5.5-14 mm. long; the stipe 1-4 mm. long; the usu- 
ally slender beak 1.5-6 mm. long: inflorescence simple 
or branching. C. 
C. Sepals borne chiefly at summit of stipe, 44-24 as long 
as body of fruit: epicarp thin and brittle, readily re- 
moved from the seed; beak fragile, slender, straight 
or curved; stigma linear to lanceolate, 0.6—4 mm. long: 
anthers 0.8-1.6 mm. long: erect terrestrial plants or, 
if aquatic, with the floating leaves rounded and cell- 
ular-reticulate beneath and flat and opaque above. D. 
D. Heads or branches of inflorescence all axillary. E. 
E. Leaves stiffish, at least the middle keeled: bracts 
strongly ascending: branches bearing 3-8 stam- 
inate and 0 (very rarely 1 or 2) pistillate heads: 
stigma 2—4 mm. long: fruiting heads 2.5-3.5 cm. 
in diameter: mature carpels lustrous; stipe 2.5-4 
mm. long: body of fruit 5-7 mm. long, 2.5-3 mm. 
thick; beak 4.5-6 mm. long: receptacle fimbrill- 
ate-alveolate: anthers 1-1.6 mm. long. 2. S. androcladum. 
