PENTANDRIA. DIGYNIA. 183 



Species. 1. F. viUoso. An active poison. 2. *fceni- 

 cuJacea. Stemless and pubescent; leaves radical, supra- 

 decompound, subbiternately f pseudo-])innate, primary di- 

 visions decussating- at the base, seg-ments rather short, 

 narrow-linear and subacute, \iltimate lacinire trifid; involu- 

 crum none; involucell dimidiate, menibranaceous, 5 to T 

 lobed; flowers yellow. 



Descript. Root perennial, fusiform. Leaves partly 

 resembling- those of the Carrot (Daucus Carola) but more 

 numerously divided, and with shorter segments. Scape 

 about 1 foot hig-h, grooved and smooth, bearing a single 

 umbell. External rays about 5, 10 to 15 lines long, with 

 several internal ones whicli are abortive. Involucell on 

 one side, consisting of a single membranaceous lobed leaf 

 nearly equal with the flowering umbellirt; peduncles short. 

 Calix minute, 5-toothed. Petals yellow, equal, oval, invo- 

 lute. Styles long and persistent; stigmas capitate. Fruit 

 compressed, suborbiculate-eiliptic, surrounded with an 

 alated margin, on either side slenderly striate; strix 5, 

 3 more conspicuous than the rest; commissure flat, naked, 

 the marginal membrane of the seed, not extending over 

 the centre. The seeds somewhat resemble those of Pas- 

 tinaca sativa and are nearly as large. 



Allied to Pastinaca. Hab. On the high plains of the 

 Missouri, commencing about the confluence of the river 

 Jauke. Flowering in April and May. This species pos- 

 sesses somewhat the scent of Fennel. 



3. jiudicatde. Nearly stemless, smooth and somewhat 

 glaucous; leaves supradecompound, subbiternately pseu- 

 do-pinnate, pimary divisions decussating at the base, 

 segments confluent, narrow-linear and acute; ultimate 

 lacinae irregularly subtrifid; involucrum none; invelucell 

 dimidiate, membranaceous, 7 to 9-parted; flowers white. 



Smyrniiim midicaule. Pursh, Flor. Am. 1. p. 196. v, s. 

 under this name in Herb. Lambert. 



Obs. Nearly allied to the preceding, but producing a 

 minute stem or elevated caudex; in this also the segments 



•j- This word, which will be hereafter used, is analogous to 

 pinnate of others; though, strictly speaking, there is not perhaps 

 a single instance of this kind of leaf in the whole order of the 

 Umbellat^e. A true pinnate leaf, has the partial leaves or 

 leaflets articulated to the common midrib, from whence they are 

 spontaneously soluble at the period of defoliation; such are the 

 leaves of Fraxinus, Robima, Amorpha^ Bignoiiia, &c. On the 

 other hand, the pseudo-pinnate leaves are always? more or less 

 confluent at their extremities. 



