PARRY — PHYSIOGRAPHY OF ROCKY MTS. 283 



numerosissimorum antheris apice truncato-appendicalatis 

 filamenta demum recurva requantibus sen eis bvevioribus, 

 ovarii urceolati striati radiis stigmatosis 13-21 disci umbili- 

 cati marginem crenatum fere attingentibus ; bacca versus 

 apicem constrictura nee rostratum sulcata. 



In small lakes, in the higher Rocky Mountains, from the 

 sources of the Platte, near Long's Peak, hit. 40, to those of 

 the Columbia River, lat. 44. Dr. F. V. Hayden collected it 

 in the then Capt. W. F. Raynold's Expedition, on June 20, 

 I860, in a small lake, between Henry's Fork and Snake 

 Fork of the Columbia River, at an altitude of 6,500 feet. 

 Miss Merrill, in the year 1862, brought from Gibson's Lake, 

 near Long's Peak, some of the large reddish sepals, verify- 

 ing her vague account of the plant; and, finally, Dr. Parry 

 gathered ample material and full notes, which have been 

 largely used in the following description, in Osborn's Lake, 

 in the same region, at an altitude of 8,800 feet, where it 

 grows with Menyanthes trifoliata, Utricularia i) iter media, 

 Scirpus, Carex, etc. ; he found it in flower in August, the 

 temperature of the water being, at the time, 58 degrees. 



The leaves are more like those of N~uphar luteum of Eu- 

 rope than those of our A 7 ! advena, being oval in outline, not 

 deltoid-orbicular, and with a narrower, more closed, sinus, 

 the obtuse lobes more gradually separating from one another. 

 In A 7 ! adoena I find the sinus often of 75 degrees ; the lobes 

 are then triangular, with acutish points; but this form of the 

 sinus, and shape of the leaf, is by no means constant, for when- 

 ever the substance of the leaf is more fully developed, the 

 lobes become broader, more obtuse, and the sinus, of course, 

 narrower, as I find it in specimens from Arkansas ; while 

 sometimes, as in specimens from Houston, Texas, the sinus 

 becomes closed up and the lobes even overlap. 



The leaves of our species were floating when observed; 

 five of them were S^-O^ inches long and 6|-7^ inches wide; 

 these five leaves, and five of JV. luteum, give each an aver- 

 age proportion of length to width as 10 to 8, while the same 

 number of leaves of N. advena, from different parts of the 

 United States, gives the proportion of 10 to 9. The differ- 

 ence seems small enough, but in the appearance of the 

 leaf is quite striking. I notice, also, a difference in the 

 venation of the leaves of these three species, there be- 

 ing, in our species, nearly three times as many veins 

 connected with the midrib as issue from the base, while 

 in both the other species I observe only about twice 

 as many from the midrib as from the base. It may, in 

 this connection, not be out of place to state that, as 

 fir as my observations extend, all the species of JVuphar can 

 be readily distinguished from all those of JVymphcBCt by their 

 venation, the former having by far the largest number of 



[July 27, 1865.] 19 



