46 MISSOURI BOTANICAL GARDEN. 
chusetts and Rhode Island. Flowering late in July.— 
Plate 14. 
Specimens examined from Massachusetts (Hitchings, July 22, 1870, 
Milton, and 1877, Readville; Boott, July 28, 1870, Readville; C. E. Faxon, 
July, 1877, Charles and Neponset Rivers, and 1882, Dedham; Edwin 
Faxon, 1891, Readville; Deane, 1890, Milton); Rhode Island (Collins, 
1890, Ten Mile River). 
S. FILIFORMIS n. sp. 
Submerged aquatic, with linear, filiform phyllodia 1.5 
to 6 dm. long, 2 10 3 mm. wide; scape slender, filiform, 6 
to 12 dm. long, branching from all but the uppermost 
verticils; bracts lanceolate, acuminate, 3 to 5 mm. long, 
at length evanescent; pedicels and branches of the scape 
filiform, 4 to 10 em. long; 1 or 2 flowers of the lowest 
verticil pistillate, the rest all staminate; verticils 6 to 10, 
remote; flowers 10 to 12 mm. wide; sepals ovate, obtuse, 
scarious margined ; petals white; stamens 7; filaments over 
twice as long as the anthers; mature achenia not yet 
collected; ovary obovate, equaled by the slender oblique 
style. — Floating in still water, Dog River, Mobile County, 
Alabama, Mohr, August 14, 1893. One of the specimens 
is proliferous at the lowest verticil of the scape, throwing 
out roots, phyllodia and flowering pedicels from the axils 
of the bracts.— Plate 15. 
More or less imperfect specimens of this are: Curtiss 31, Long Moss 
Spring, Jackson Co., and Jacksonville, Fla.; plants collected by Chap- 
man, 1842, near Apalachicola; and by Keeler near Jacksonville. These 
were all distributed as S. graminea. 
§ § § Integrifoliae. Leaves entire or hastate, from linear to ovate, 
neither sagittate nor floating; bracts free or connate at the base; 
stamens 12 or more; filaments slender, or dilated and pubescent. 
* Fertile pedicels neither thickened nor reflexed in fruit, 
+ Achenium falcate, obovate, with an oblique beak; leaves lanceo- 
late, entire, pseudo-penninerved; stamens more than 20; filaments slen- 
der as long as or longer than the linear oblong anthers. 
20 
