CLASS XIII. ORDER I. 231 



the stigma, are merely produced by the apposition of the sta- 

 mens in the bud. The petals and stamens are also truncated, in 

 consequence of the depressed and globular form of the bud ; 

 which is one of the best generic marks. 



In the number of its calyx leaves, and its undulated stigma, 

 this plant is N. advena. In its semicylindrical petioles and num- 

 ber of rays of the stigma, it is N. lutea. In northern latitudes 

 where the roots can only exist in deep water, the leaves are al- 

 ways floating ; in southern, where they can live in shallow 

 water, the leaves are erect. 



NuPHAR KALMiANA. Ait. Kcibn' s Water Lily. 



Leaves cordate ; the lobes subapproximate ; calyx 

 five leaved ; stigma cut with from eight to twelve 

 rays. 



A small species appearing like a diminutive offspring of the 

 preceding. Mr. Eddy has observed that the submersed root leaves 

 are very large, membranous and waved. — In Sudbury river. — Dr. 

 Boott. — June. 



237. NYMPH^A. 

 Nymp^a odorata. Sweet scented Water Lily. 



American Medical Botany, PI. Iv. 



Leaves orbicular-cordate, entire ; the lobes acumi- 

 nate, and veins prominent beneath ; calyx four leaved, 

 equal to the petals. 



Few plants possess a more exquisite fragrance than the com- 

 mon white water lily. It is found only in deep waters, where its 

 roots are secured from the frosts in winter by a sort of natural 

 hotbed being thus provided for it. The roots creep through the 

 muddy bottoms of ponds to a great extent. They are very 

 rough, knotted, blackish, and as large as a man's arm. The 

 stalks, both of leaves and flowers, spring directly from the root. 

 They vary in length, from one foot to five or six, according to 

 the depth of the water. Petioles somewhat semicircular, scapes 

 round. Both are perforated throughout by long tubes, or air ves- 

 sels, which serve to float them. The leaves, which swim on 

 the surface, are nearly round with a cleft or sinus extending to 



