142 PENTANDRIA, DIGYNIA. 



139. GEXANTHE. Gen. pi. 484. ( Umbellifevce.) 



Fruit ovate -oblong, corticate, solid, apex 

 denticulate, crowned with the persistent 

 style, ridges (or stria?) (on each seed) 3 or 

 5 obtuse. Universal involucrum scarcely 

 any. — Sjprengel. 



rigidius. i. (E. leaves all pseudo-pinnate; leaflets sessile, 

 oblong-lanceolate, entire or incisely toothed ; 

 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, ail sessile, 

 circumscribed by a whitish and somewhat sca- 

 brous margin. Involucell about 8-leaved, subu- 

 late. Calix 5-toothed, acute. Petals cordately 

 inflected; many of the central sessile flowers 

 sterile. Styles persistent, peltately dilated at 

 the base, scarcely a line in length, divaricate, 

 obtuse or rather truncate, and distinctly groov- 

 ed on the upper side. Fruit elliptic-ovate, dor- 

 sally 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; 

 strise 5. — Nutt. 



Shim rigidius, Willd., Mich., Pursh, &c. 



Sison marginatum, Mich ? 



About three feet high. The leaves are often entire ; some- 

 times deeply and remotely toothed. In swampy ground bor- 

 dering the Delaware and Schuylkill, common. 



amhigua. 2. (E. stem even, with few leaves ; leaves all pseu- 

 do-pinnate, leaflets three to five pair; narrow- 

 linear, long and entire, all sessile and acute, 

 under side glaucous ; involucrum 2 or 3 -leaved ; 

 umbels terminal, nearly solitary. Obs. Root 

 perennial, tuberous ? Stem tall, smooth, striate, 

 fistulous and cylindric. Leaves distant, with 



