PENTANDRIA. DIGYNIA. 181 



Leaves ternate; (involiicellum in /. ostruthium 1 or 2- 

 leaved, minute.) 



Species. 1. 1. lucida. Sp. Angelica lucida. L. Selinum 

 Canadense? Mich. 



The plant quite smooth, and scarcely inferior in size 

 to Heraclenm Sphondfjlium. Leaves primarily 3-parted, 

 and decempound, the segments conflaent in 5's, of which 

 the more complete are oblong-ovate, acute, mucronately 

 and deeply serrate; sheaths remarkably large and ventri- 

 cose, towards the summit of the stem nothing is produced 

 but tliese large and membriinaceous sheatlis, and no 

 other kind of involucrum; the flowering umbell consist- 

 ing of many rays is so dense as to appear nearly he- 

 mispherical; partial involucrum minute and setaceous: 

 flowers white and regular; with the seed I am unac- 

 quainted; advanced germ truncated, roundish, somewhat 

 gibbous and compressed, slightly striated. Whether^this 

 be Sprengel's plant or not, I have not the means of 

 ascertaining, being unacquainted with the mature fruit, 

 in the absence of which the definition becomes an insol- 

 vable riddle, 



A genus now, according to Sprengel, including 6 spe- 

 cies, chiefly separated from Angelica and Selinum. 



264. HERACLEUM. X. (Cow-Parsnip.) 

 Calix nearly entire. Petals emarginately in- 

 flected, often of 2 forms. Fruit elliptic, dorsally 

 compressed, flat, apex emarginate, margin mem- 

 branaceous. iS^eei/with 3 stride, «* intervals ma- 

 culate halfway down, — commissure flat, bima- 

 culate." Spreis^gel. — Iiivolucnini none. 



Umbell and umbellet many-rayed; invplucell 3 to 7- 

 leaved, outer leaves longer; central flowers sometimes 

 abortive, radial ones in H. angustifoUum not differently 

 formed. 



Species. 1. TI. lanahnn. A genuine species, and 

 scarcely distinct from H. Sphondylium. 2. * Sphondylium. 

 On the banks of the river Missouri. Inner part of the 

 young stems eaten by the savages of Columbia river. 



Chiefly an European genus, of about 16 species. 



265. PEUCEDANUM. L. (Sulpliur-wort.) 

 Calix minute, ^-toothed. Petals oblong, in- 

 curved, equal. -Fruit oval, dorsaily and flatly 



K 



