rETRANDRIA, TETRAGYNIA. y5 



roundish ; four minute infertile filaments opposite the petals. 

 rs none. TfjjUHIfi four, like so man} minute points. Cap- 

 .. lour. oblong, compressed, KMBCwhat divergent at tl 

 points. UX to eight seeded, opening internally and longitudi- 

 nally remaining connected at the base, so as to resemble a 

 single capsule of tour valves. Seeds oblongcylindric, brown- 

 ish, attached in two rows to the margins ot" each capsule. — 

 Nute. Journal Acad Nat. Sc. Phil. vol. 1. p. 114. 



This minute subaquatic plant was first discovered, as an in- 

 habitant of this country, b\ Mr Nnttall. from whose accurate 

 description I have copied the above account. In company with 

 that gentleman, I subsequently found it, where he had detected 

 It appears that it has more recently been found by Dr. 

 Ives near Newhaven, who has erroneously referred it to the 

 T. connata of South America, for it does not agree with the 

 ire of that plant in the Flora Peruviana. — On the miry and 

 ivclly shores of the Delaware, subject to the overflowing 

 the tide, just above Kensington, abundant. Annual. July 

 to September 



90. POTAMOGETON, L Gen. pi. 234. (Najades.) 



Calix 4-leavcd. Corolla 0. Style 0. Seeds 4. 



Leaves sheathing ; those of the stem often attenuated, floral 

 leaves mostly opposite ; flowers spiked, terminal, or axillary; 

 ramuli and spikes, having frequently 2 sheaths at the base. 

 Nut 1 -seeded, cochleate ; embryon erect, exalbuminous, curv- 

 ed, involute. — Nutt. 



1. P. leaves swimming by long petioles, sublanceo- natans e 

 late-oval, the first ones sometimes subcordate. — m.x. 



Mich. 



In ponds, ditches, and slow-flowing waters. Flowers in 

 terminal and rarely axillary spikes — small and green. Very 

 abundant on the road to Gloucester Point. Perennial. June, 



July 



2. P. lower leaves very long, linear ; upper ones Ian- nuitaas. 

 ceolate, nerved coriaceous, all-petiolated. — Willd. 



In similar places, but les9 common. Also on the road to 

 Gloucester Point. Perennial. July. 



