168 BOTANICAL GAZETTE. [July, 
when fresh, the stigmas lighter in color: fruit with a narrow neck 
under the disk, about an inch long by an inch diameter: floating 
leaves vary from 3 to 8 inches in length and 2 to 6 in breadth, 
the sinus open or closed, occasionally pubescent beneath ; sub- 
merged leaves orbicular. 
N. lutewm Gray Man. non Sm. The true N. /uteum Sm. has larger flowers, 
petals larger and generally more obovate, and stamens larger with broader fil- 
aments, as shown in the plate. 
Lake Champlain, Vt. Intermediate between N. advena and the following, 
and produced from a hybrid between them. Still a hybrid in many localities. 
3. N. Kalmianum Arr. Smaller than N. rubrodiscum, flower 
an inch broad or somewhat less when expanded: sepals 6-73 lines 
long: petals thin and delicate, spatulate or obovate, about 2 lines 
long by 1 broad: stamens 3 and 4 rows, narrowly linear ; the an- 
thers occupying only } of the length: stigmas 7-10 ridges of a 
golden color upon a dark red stellate shield, which is 2—3 lines in 
diameter: floating leaves from 2-4 inches long and from 1- 
broad, commonly more or less pubescent beneath, the sinus 
open or closed; submerged leaves circular, very thin.—Att. | 
Hort. Kew. 3, 295 
N. pumilum Caspary, Ann. Mus. Lugd. Bat. 2. 256. Macoun’s Cat. Can. Pl. 
non Smith. N, luteum Sm., var. pumilum Gr. Man. 57. N. lutea, var. Kalmiana T. & 
Gr. Fl. 1. 58. 
A beautiful little plant which occurs from Newfoundland to Penn. and as 
far northwest as the Saskatchewan. It bears a strong resemblance to the Euro- 
pean N, pumilum, but that differs from our plant morphologically in having 
the filament much thinner and broader, and the anther broader and shorter. 
The difference is shown in the plate. The European plant also is commonly 
much more pubescent. When crossed the two plants produce a hybrid, show- 
ing a physiological difference. 
4. N. polysepalum Encetm. Flowers the largest of the genus, 
2-5 inches across when open: sepals 7-12, the largest 2 inches 
long and nearly as broad: petals 12-18, thick, often reddish, 9 
lines long by 3-4 wide, dilated upwards, truncate: stamens 7-9 
rows, 5-6 lines long by 1 wide; anthers truncate, equaling the 
filament: stigmatic disk deeply urceolate, with entire or crenate 
margins, often pubescent on the top, the stigmas hardly reaching 
the margins: fruit smooth, ovoid, 1-2 inches in diameter, con- 
tracted into a short neck under the disk: seeds rather small as 
compared with those of N.advena: leaves smooth, broadly ovate, 
7-12 inches long by 5-9 broad, the sinus open or closed: pe- 
duncles and petioles smooth or pubescent, generally quite pubes- 
cent when young.—Trans. Acad. St. Louis, 2. 282. 
This species is found from Colorado to California and thence northward 
