rENTAXDHIA. DIGINIA. 189 



pears to liave been very complete, and collected also by a 

 botanist, 1 dare not for the preserit announce it as a dis- 

 dinct species. This genus appears to be somewhat allied 

 to Sison, but certainly distinct. To Hydrocotyle it can 

 have no pretensions. 



274. (ENANTHE. i. (Water Dropwort, Fili- 

 pendula.) 



" Fruit ovate-obloni^, corticate, solid, apex 

 denticulate, crowned with tlie persistent style, 

 ridges (or striae) (on each seed) 5 or 5 obtuse. 

 Universal involucium scarcely any."SpRENGEL. 



Umbell formed of few rays; umbellets subglobose, with 

 the flowers often sessile. Involucell many-leaved. Poi- 

 sonous plants, mostly aquatic, having- roots with pendu- 

 lous tubers, fistulous striated stems, and pseudo-pinnated 

 leaves, commonly twice compounded near the root, often 

 laciniated, segments mostly entire on the margin. 



Species. 1. (E. carolinensis. -f- 2. Fhellavdrium. Lam. 

 DecandoUe. Fliellandrium aqxiaticnm. L. Hab. On the 

 Hocky Mountains? Ph. 3. rigida. Leaves all? pseudo- 

 pinnate; leaflets sessile, oblong-lanceolate, entire or in- 

 cisely toolhed; involucrum none; styles peltately dilated 

 at the base, extremely short; fruit subelliptic. Obs. 

 Stem erect, rigid, terete, even, striate, and fistulous. 

 Leaflets 4 or 5 pair, all sessile, circumscribed by a whitish 

 and somewhat scabrous margin. Involucell about 8- 

 leaved, subulate. Calix 5-toothed, acute. Petals cor- 

 dately inflected; many of tjie central sessile flowers ste- 

 rile. Styles persistent, pcl'alely dilated at the base, 

 scarcely a line in length, divaricate, obtuse or rather 

 truivcutc, and distinctly grooved on the upper side. Fruit 

 elliptic-ovate, dorsally compressed, flat, (as in Pastinaca 

 sativa.) Seeds rather large, with a suberose prominent 

 subalated margin continued inwards so as to cover the 

 seed, slenderly striated on the back; stri?e 5. 



Shim rigidius. Willd. sp. pi. 1. p. 1433 Pursh, Flor. 

 Am. 1. p. 194. Probably Sisoii marginatum. Mich. Fl. 

 Am. 1. p. 163. 



3, *atnbigua. Stem even, v.'ith ^cw leaves; leaves all 

 pseudo-pinnaie, leaflets three to five pair; narrow-linear, 

 long and entire, all sessile and acute, under side glau- 

 cous; involucrum 2 or S-leaved; umbells terminal, near- 

 ly solitary. Obs. Root perennial, tuberous? Stem tall, 

 smooth, striate, fistulous and c\lindric. Leaves dis- 

 t^ntji. with small sheaths, only about 4 or 5 on the whole 



