60 Rhodora [Marcu 
A WELL MARKED SPECIES OF SPARGANIUM.— Among the Bur-reeds 
of New England there is none which can be more readily recognized 
than a plant which grows in deep water of cold lakes. Its salient 
features are a branched inflorescence, sessile heads, short oblique 
stigma, and firm-coated oblong-fusiform fruit ending in a stouitsh 
rather rigid falcate beak. Most of our other bur-reeds show a pref- 
erence for shallower or warmer water, wet sandy shores, etc., and none 
of them shares the traits of or show any intergradation with this well 
marked species, which may be characterized as follows: 
Sparganium fluctuans, n. comb. S. simplex, var. fluitans, 
[Engelm. in] Gray, Man. ed 5, 481 (1867), not S. fuitans, Fries. 
S. androcladum, var. ffuctuans, Morong, Bull. Torr. Bot. Club, xv. 
78 (1888); Britt. & Br. Ill. Fl. i. 64 (1896). Gracile vel medioc- 
riter robustum, 2.6- 15 dm. longum; basi erecta alte immersa, parte 
superiori foliorum natante; radice e fibris numerosis flavo-brunneis 
composita; foliis linearibus leviter carinatis 3-11 mm. latis, basali- 
bus perlongis, caulinibus gradatim brevioribus, bractealibus 3-12 cm. 
longis basi paululum saccato-ampliatis; inflorescentia ramosa, ramis 
saepissime 3 capita arcte sessilia 1-2 inferiora 9 2-4 superiora d 
gerentibus; capitibus 9 ad maturitatem 2 cm. diametro; stylo 
unico leviter curvato, stigmate obliquo ovale vel brevissime oblongo ; 
fructu fusiforme vel media parte subcylindrico vel etiam subconstric- 
to, apice in rostrum firmiusculum falcato-gladiatum persistentem 
attenuato, exocarpo firmo laevi vel obscure striatulo.— Cold lakes 
and ponds, Western Central Maine to southern Quebec, Connecti- 
cut, and Minnesota. Specimens examined : — QueEBECc: L. Mem- 
phremagog, 1 Aug. 1903, Churchill. MAINE: Cambridge, Bunker; 
Sweet's Pond, New Vineyard, 15 Aug. 1894, Fernald; Pease Pond, 
Wilton, 11 Aug. 1894, Fernald; Hartford, July, 1886, Parlin; E. 
Auburn, Merrill, mo. 381. New HAMPSHIRE: Ponds at base of 
White Mts. Oakes. Vermont: Chittenden Pond, 18 Aug. 1895, 
Eggleston; L. Dunmore, 11 Aug. 1896, Brainerd; Wallingford, 4 
Sep. 1898. Eggleston. (CONNECTICUT: Nettleton's Pond, Norfolk, 
Sep. 1864, Robbins. L. SUPERIOR: Beardslee. MINNESOTA: Ver- 
milion Lake, Arthur, Bailey, & Holway, No. B. 83.— B. E 
RoniNSON, Gray Herbarium. 
Vol. 7, no. 74, including pages 21 to 40, was issued 26 February, 1905. 
