186 TENTANDRIA. DIGYNI A. 



Umbell large, many-rayed, spreading-; umbellet dense, 

 subhemisphei-ic; involucell about S-leuved. Leaves large, 

 often biternalely pseudo-pinnate. (Seed with longitudinal 

 alated margins, extending int>.rnally over the wiiole sur- 

 face of the commissure in Jl. triquinata.) Calix 5-toothed; 

 petals inflected. 



Species. 1. A. triquinata. Oes. Leaves sharply and 

 incisel}' serrate, very smooth, lateral leaflets oblong-ovate. 

 Involucrum none. Peduncle, pedicell, and immature 

 seed, minutely pubescent. Jnvolucell 7 or 8-leaved, leaves 

 almost filiform and subulate, long'er on one side. Umbel- 

 let unequal, dense; flowers white. Petals oval, obcor- 

 dately -inflected, inflected point long and subulate. Styles 

 long and deflec;.ed. Seeds roundish-elliptic, dorsally com- 

 pressed; margin alated, ancipital; dorsal or approximat- 

 ing ridges o, acutely margined, alm.ost rectilinear. — Hab. 

 'From Canada to Carolina- Common aroimd Philadelphia. 

 Certainly a genuine species, and admirably accordijig 

 with the improved generic character of the ingeniotis 

 bprengel, '^ 



2* atropvrpvrea. 3. lucida. 



of this genus there are about 8 species enumerated, 

 which, excepting the above, are all indigenous to Europe. 



sri. SIUM. X. (Water- Parsnep.) 



Calioc obsolete, v. Petals cordatcly inflected. 

 Fruit siibovate, laterally compressed, and 

 striate. 



Involucre and involucell many-leaved; leaves mostly 

 pseudo-pinnate, and serrated on the margin. Styles rather 

 long, persistent and deflected; stigmas capitate. Fruit 

 small; oblong or oval, laterally or obversely compressed, 

 giving a narrow oblong commissure. Seed ovate, gib- 

 bously convex, equally scored with 5 elevated ridge.';, and 

 4 intervening grooves. (Character from Siiun latifoUum ^ 

 as it appears in America.) Nearly allied to Canarii which 

 produces an involucrum of a single leaf. 



Species. 1. S- latifoliinn. (Calix obsolete, and not 

 5-toothed in the American plant-) 



2. lineare. Stem deeply grooved; leaves pseudo-pin- 

 nate, 2 to 4 pair; uppermost ternate, terminal leaflet 

 petiolate; leaflets long, sublanceolate -linear, margin sub- 

 ciliately-serrate, serratures nearly equal, small and some- 

 times rather distant, umbells terminal, (involucre and 

 involucell many-leaved.) — Obs. Stem various in height, 

 generally .tall; m the smaller plants, the strrutures 



