£12 MONOECIA. POLYASDRIl. 



Species. 5. * amhigxnim. Stem floating", dlchotori.C/n.s.; 

 leaves petiolate, pseuJopinnate, the lowest capillary, 

 emerging" ones pectinate, uppermost i^early entire, sabser- 

 rate; anthers partly ublong". Has. In the spring ponds of 

 New Jersey, iioating' in extensive masses, v. v. v. .?. I;i 

 Herb. Collins. Obs. Stem diffusely dichotomous, float- 

 ing", radicles often simple. Leaves attenuated below so 

 as to appear pctiolated, pectinately pinnatlfid; immersed 

 leaves divided into long capillary segments, divisions of 

 the upper leaves short, setaceous and acute, from one to 

 5 pair; uppermost leaves often oblong-linear and nearly 

 entire. Flowers axillary, solitary, sessile, bibracteate, 

 bractes dentiform, acute. Germ quadrangular, angles 

 terminating above in the segments of the calix. Calix 4- 

 parted, divisions oblong-ovate, erect, concave, reddish. 

 Stamina the length of the calix, sheathed by its segments, 

 not exserted; filaments minute; anthers somewhat oblong. 

 Styles none. Stigmas 4, roundish and villous or pencil- 

 late. Fruit 4 coated, cylindric-oblong seeds, furnished 

 vith internal sutures, and attached to a minute setaceous 

 axis 



/3. * litnosiim, Ste.m rooting, erect; leaves rigid, partly 

 entire, or divided above, mostly trirld, segments setace- 

 ous and acute. Hab. On the mirey siiores of the Dela= 

 ware, also in New Jersey. This appears to be the P^;-- 

 shin humiUs of Mr. Rafinesqae, Ne'.v York Med. Rep. 2. p. 

 361 ? Stem erect. 2 to 4 inches high, decumbent and ra- 

 dicant, attenuated upwards. Leaves rigid and spreading, 

 very narro'.v, setaceous and acute, e.ther simple, or irre- 

 gularly divided toivards the extremity Inia 2, but mostly 

 3 and sometimes 4 alternate and terete segments. Flow- 

 ers as in the preceding, but the anthers are roundish. 

 -—The occurrence in sonie situations of pi'.mately divided 

 leaves, as I have observed in New Jersey, proves this 

 plant to be merely a variety of the former. In the herba- 

 rium they would by many be considered as distinct spe- 

 cies. 



Of the genus Myriophyllum, besides the above, there is 

 1 species'in India, and 1 in New Holland; Xos. 1 and 2 

 are common to Europe. 



750. SAG1TTARL\. L, (Arrowhead.) 



Calix 3-leaved. Petals 3. Stamina about 9.4. 

 Germs many. Capsules? aggregated, 1 -seeded^ 

 not opening. 



Aquatic plants mostly producing sagittate leaves, occ?.- 



