588 



MONOECIA TRIANDRIA 



I 



1. Verticillatum 



Lin. 



M, 



foliis 



1^ 



pinnatis 

 suoeriori- 



i 



capillaceis, 

 bus pectiQato-pmnatifi- 

 dis; floribus axillaribus, 

 verticillatis, superiori- 

 bus masculis, 8-andris. 



I 



Leaves pinnate, ca- 

 pillarys the upper pec 



tinate, pinnatifid; flow 



ers axillary, 



ver 



ticil- 

 late, the upper sterile 

 octandrous. 



Sp. pi. 4. p. 407. Mich. 2. p. 190- Pursh,l.p.2r4. Nutt.^.p^Sll. 

 The upper florets of this species sometimes produce both styles and sta- 



mens. 



Grows from Canada to Carolina; and in Lower Louisiana, N«tt 

 Flowers Julv— August. Pursh. 



2. S 



t 



Mich 



Leaves pinnatifid 



„.^..o '.T£.ftir»iUate ax 



flower 



verticillat 



m 



nferioribus fo 

 fructu 



iUary; the upper sterile 

 tetrandrous, the lower 

 fertile: fruit 8-angled. 



M. foliis pinnatifidis 

 floribus omnibus verti 

 cillatis axillaribus; su 

 periorib 



andris, 

 emineis; 



gulato. 



Mich. 2. p. 190. Sp. pi. 4. p. 408. Pursh, 1. p. 274. Nutt. 2.p. 

 Potamogeton Pinnatum, Walt. p. 90. , 



Root perennial. Stem about 12 inches high, terete, P'*^"|^Je, gen- 

 assurgent, floating, taking root at the lower joints. ^^JT^^'er linear, pin- 

 erallv by fours, the lowest setaceous resemhhng hbres, trie upp fi^weTS 

 natifid, rarely an inch long, with 2 segments usually ^"^f ^'^" ^T^/a of both 

 verticillate, also by fours, sessile, small; the upper sterile, vo ^^-^ 



florets pale purple. Stamens 6, scarcely longer than the ^Y^^i^ei rib 

 as if composed of 4 seed united each having an elevated broaa * 

 along the back. 



Grows in shallow ponds. , , , .,„,npr 



Flowers April— June, and probably through the whole summer 



S. llEtEROPHYLLUiM. 



M. foliis inferioribiis 



Mich. 



Lower leaves cap 



capillaceo pinnatis, s«-|lary, pinnate 



9 



the up 



