212 MOiNOEClA. PuIiYANURlA. 



Species. 5. * ambigmim. Stem floating-, dlchotomous; 

 leaves petiolate, pseuJopinnute, the lowest capillary, 

 emerging ones pectinate, uppermost r?&arly entire, subser- 

 rate; anthers partly oblong. Hab. In the spring ponds of 

 New Jersey, floating in extensive masses, v. v. v. s. In 

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

 ing, radicles often simple. Leaves attenuated below so 

 as to appear petiolated, pectinately pinnatifid; 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, sessilp, bibracieate, 

 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 hy its segments, 

 not exserted; fiiamenls minute; anthers somewhat oblong. 

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

 late. Fruit \, coated, cylindric -oblong seeds, tur:iished 

 with internal sutures, and attached to a minute setaceous 

 axis 



/3. * limosum Stem rooting, erect; leaves rigid, partly 

 entire, oi- divided above, mostly tritid, segments setace- 

 ous and acute. Hab. On the mirey shores of the Dela- 

 ware, also in New Jersey, l his appears to be the Pur- 

 shia humilis of Mr. Hulineaque, New York Med. Rep. 2- p. 

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

 dicant, attenuated upwards. Leaves rigid and spreading, 

 very narrow, seiuceous and acute, e ther simple, or irre- 

 gularly divided towards the extreuwly into 2. but mostly 

 3 and'somt-times 4 alternate and terete segments. Flow- 

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



The occurrence in so.riC situations of pinnately divided 



leaves, as 1 have observed in New Jersey, proves this 

 plant to be iTicreiy 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 m New Holland; Noi. 1 and 2 

 are common to Europe. 



750. SAGlTTARIxi. L, (Arrowhead.) 



Calix 3-leaved. Petals 3. Stamina about 24. 

 Germs man^. Capsules? aggregated, l- seeded^ 

 not opening. 



Aquatic plants mostly producing sagittate leaves, ocva- 



