122 Rhodora [JULY 
(form with remarkably elongate bracts). Arizona: Mormon Lake, 
June 6, 1898, MacDougal, no. 75. Ipamo: Pend Oreille River, 1861, 
Lyall; ponds and streams, Falk’s Store, Canyon Co., June 28, 1910, 
J. F. Macbride, no. 302. CaLrrrornIa: Big Meadows, August, 1879, 
Mrs. R. M. Austin; Presidio, June, 1801, Michiner & Bioletti, no. 
175; Mountain Lake, San Francisco, June 27, 1892, J. W. Blankin- 
ship; Bear Valley, San Bernardino Mts., August, 1882, Parish, no. 
1,433. OmEkGoN: sluggish stream, Malheur Co., June 24, 1898, 
Cusick, no. 1,959. Wasmıncron: Seattle, August, 1892, Piper, no. 
1,132; Lake Cushman, Mason Co., August, 1895, Piper, no. 2,230; 
Blakeley Island, San Juan Islands, 1917, S. M. & E. B. Zeller, no. 
1,144 (distributed as Cerátophyllum demersum). 
Myriophyllum exalbescens has always passed in America as M. 
spicatum L. The latter species of Eurasia, however, differs from the 
American plant in several characters: the principal leaves of the 
primary stems have 14-21 pairs of rigid slenderly linear divisions; 
the bracts are rhombic-obovate; the bractlets are suborbicular or 
reniform, broader than long, and distinctly shorter than in most of M. 
exalbescens, 0.5-0.8 mm. long; and the linear anthers tend to be longer, 
being 1.8-2.2 mm. in length. In M. exalbescens, furthermore, the 
dried stems very strongly tend to become white, although this change 
is not always noted; in M. spicatum, however, the old herbarium- 
specimens still retain a fulvous or olivaceous tone in the stems. 
On the Magdalen Islands occurs a species of Myriophyllum which in 
foliage and in the whitening of the stem upon drying strongly suggests 
M. exalbescens but with fruit so very unlike that of the latter species 
or of the old world M. spicatum or of any species known to the writer 
that it is here proposed as 
MyriopHyLLuM magdalense, n. sp., M. exalbescenti simile; caule 
ramoso in statu exsiccato exalbescente, foliis plerumque 4™* 1-2 em. 
longis segmentis 3-7-jugis capillaceis flaccidis 0.5-1.3 cm. longis, 
superioribus emergentibus elongato-oblanceolatis vel linearibus brevi- 
ter pectinatis vel subintegris; spicis terminalibus rhachi filiformi 
floribus verticillatis inferioribus foemineis superioribus masculis 
sessilibus; bracteis elongatis lineari-oblanceolatis conduplicatis apice 
sursum curvatis integris vel inferioribus pectinatis 0.3-1 cm. longis; 
bracteolis ovatis 0.6-0.8 mm. longis; petalis ovato-oblongis concavis, 
1.5 mm. longis; staminibus 8, antheris oblongis 1.5 mm. longis 
(immaturis); fructibus subglobosis 3 mm. longis latissime 4-sulcatis, 
merocarplis dorso rotundatis rugosis. 
