PENTANDRIA DIGYN1A 183 



Obs. This species is generally dioicous; but I have seon several specimens 

 where the fertile flowers were perfec^—ln which cases the petals were compare 

 lively large, and the ovaries not quite so urceolate, as in the merely pistillate om f 



These two are the only species hitherto known in the U. States. Prof. Hooker de- 

 icribes a thirds (P. horridum -large, shrubby, and pricklyO wiuch grows west of 

 riie ilocky Mountains; and may yet, perhaps, be Lund within tho limits of the 

 Union* 



f f Fruit (fry: — twin carpels. True Umbelliferje, 

 Sl*h-Ohd. 1. Seed -with the face fat, or plane. Orthospermjk. DC. 



1. IIvdrocotyle Tkirb. Fruit laterally compressed. Carpels convex or acute 

 •n the back. IIydiiocotvj.e^e. DC. 



136. HYDROCOTYLE. L. J\*utt. Gen. 255. 

 < c Gt. Hydor, water, & Kotyle % n cup; in allusion, perhaps, to the form of the leaves*] 



Calyx with the limb obsolete* Petals ovate, acute, entire, with the 

 Apex straight. Fruit suborbicular, compressed at the .sides. Carpels 

 with 5 filiform ribs; the middle and lateral ribs often obsolete, the in- 

 termediate ones arched; without vittx % Involucre minute, few-leaved. 



1. II. ameuicaxa, L. Glabrous; leaves reni form-orbicular, obscure- 

 ly 7 or 9 lobed, doubly crcnate, 9-nervcd ; umbels few-flowered, subses- 

 sile, opposite the petioles. Beck, JJot. p. 140. 



American- Htdrocotylb, Vulgd — American Marsh Pennywort. 



Root perennial, tuberous, Mx. Stem to 12 inches long, very slender, procum- 

 bent, angularly flexuose, or geniculate, compressed, nerved, with long filiform 

 itolones, or runners, branching from the axils of the leaves. Leaves nearly or 

 bicular, about an inch or an inch and a half in diameter, rather wider than lorn* 

 pale green, thin and membranaceous, somewhat crenately lobed, divided to the 

 petiole at base; petioles I to 2 inches long, compressed, nerved, resembling the 

 item, often with a lew white scarious bristles near the leaf. Umbels or glome rub \h 

 1 or o to 6 llowered, nearly sessile, at the axils, or joints, but opposite the petioles, 

 with a very minute few leaved involucre. Flowers small. Petals greenish white. 

 / % ruit orbicular-ovate. 



Bab. Swamps, and moist shaded places: frequent. Fl. July. Fr. Sept. 



Obs. Four additional species (as the genus is now constituted by De Candolh . • 

 have been found in the U. States :— of which, probably, the 11. umbellate may yet 

 be found along the Schuylkill, in this County,— as I have seen it in abundance al 

 die village of Mauayunk. 



b. Umbels imperfectly compound. 

 3.* Sanicula Tribe. Fruit ovoii>globose. Saniculeje. DC. 



137. SANICULA. L. Mat. C en. 258. 

 [Latin, Sanare, to heal ; from its supposed virtue in healing wounds. j 



MoxoitorsLT Poltgaxous: Stamixate Fl. pedicellate. CaU/J 

 smooth, with 5 segments. Perfect Fl. sessile. Calyx echinate"at 



— ^" 



* I retain, for the sake of correspondence, the numbers of the Tribes, as an an; 

 «d by Prof. De CandolU. We have no plants, here, belonging to his 2ud, Sth, 9th. 

 10th and 1 1th Tribes. 



