22 
Washington and California. Also Mexico and Cuba. July—Oc- 
tober. (Plate XXXI., showing a submerged leaf on the right.) 
8. POTAMOGETON FAXON1, Morong. n. sp. 
A plant collected by Mr. Edwin Faxon in the years 1880 and 
1882 in Lake Champlain at Ferrisburg, Vt., which has been re- 
ferred to P. rufescens, but is evidently quite a different species. Mr. 
Arthur Bennett, to whom I sent specimens, suggests in Jour. Bot. 
xxviii, 301, that it may be a hybrid between P. rufescens and Р. 
Nuttall (Claytonii), and also states that it greatly resembles his Р, 
Су Ла, but cannot with certainty be classed under that species. 
If it is to be regarded as a hybrid, which may be the case, I should 
much rather consider it the offspring of P. lonchites and P. 
rufescens, as both of those species abound in the vicinity, and on 
the whole it more nearly resembles the former than any other 
North American species. 
Floating leaves numerous, thick, coriaceous, mostly obovate or 
oblanceolate, bluntly pointed or obtuse at the apex and sloping 
into the petiole at base, many of them obovate like those of rufes- 
cens, and often strikingly like those of spathuleformis, 2—3V4 
inches long and 8—12 lines wide, 13-17 nerved, on petioles 2 to 6 
inches in length. Submerged leaves oblong-lanceolate, acute or 
sometimes obtuse, 3-5 inches long and 6-12 lines wide, 5-13 
nerved, often with an irregular areolation on each side of the 
midrib; on petioles 13-2 inches in length. The nerves run into 
the apices of the leaves, and the numerous cross veins slope 
slightly upward at a large angle from the midrib. Peduncles a 
little thicker than the stem, 2 to 5 inches long. Spikes 1 to 2 
inches long, densely flowered. No fruit found. 
The plant occurs in the still waters of the lake and also in the 
rapids of creeks emptying into the lake. 
It is named in honor of Mr. Edwin Faxon, of Jamaica Plain, 
Mass., who was the first to collect it. (Plate XXXII). 
9. POTAMOGETON MEXICANUS, Ar. Bennett, Jour. Bot. xxv. 289 
(1887). 
I have seen only the fruit of this species. The following is Mr. 
Bennett's description of the stem and foliage: * Rootstock creep- 
ing; stems simple. Lower leaves 3-5 inches long, alternate strap- 
shaped, elliptical, tapering at either end; petioles 3-5 inches long. 
