142 Rhodora ` [JuLY 
A CORRECTION CONCERNING SAGITTARIA TERES WATSON AND 
PoTAMOGETON Lucens L.— Dr. J. C. Phillips published recently 
(Auk xxviii. 188-200, April, 1911) an article entitled, “Ten years of 
observation on the migration of Anatidae at Wenham Lake, Massa- 
chusetts.” Wenham Lake lies about fifteen miles north of Boston. 
On page 188, among other pond weeds mentioned as “ common to the 
lake, very kindly identified for me by Mr. W. L. MeAtee of the U. S. 
Biological Survey” are Sagittaria teres and Potamogeton lucens. As 
S. teres Watson has been recorded but once north of Cape Cod (Ruo- 
DORA xii. 4, 1910), I wrote to Mr. McAtee, and he very generously 
sent me all the Wenham Lake specimens of the various species recorded 
in Dr. Phillips’s article to examine and to keep. 
The plant identified as Sagittaria teres proves to be the common 
Eleocharis acicularis (L.) R. & S., a form with the submersed capillary 
culms from 8 to 12 centimeters in length. 
His Potamogeton lucens is P. amplifolius Tuckerm., a species frequent 
in the northern half of the Boston District (Rnopona xi. 206, 1909). 
P. lucens L. does occur at Wenham Lake and I have a specimen in my 
herbarium collected there by J. W. Robbins, no date, but it is a rare 
plant near Boston (RHopora xi. 207, 1909), and has not been collected, 
so far as I know, for a good many years. 
Mr. MeAtee has very courteously urged me to write this note. 
WALTER Deane, Cambridge, Massachusetts. 
A WHITE-FLOWERED SPIRAEA TOMENTOSA.— Professional system- 
atists are, perhaps, too often inclined to ignore color-variation. On 
the other hand, there is probably no other vegetative phenomenon 
that plays a larger part in inciting and maintaining the interest of the 
local flower lover or amateur botanist. No one among us can fail 
to admit having experienced a certain thrill of delight over the first 
white Fireweed we chanced upon. However superficial color varia- 
tion of this kind may be, the fact must remain that nature furnishes 
few changes that are more striking to the eye or that leave a deeper 
impression on the mind. How often has the discovery of a favorite 
plant with petals clothed in an unfamiliar hue added just the needed 
touch of excitement to a day a-field! 
Treated subjectively rather than objectively, then, this kind of 
