CoNiosELiNUM. UMBELLIFER JJ. 275 



12. CONIOSELINUM. Fisch. in Hoffm. Urnh. ed. 2. p. 185 tit. f. .5, ex DC. prodr. 4. 



p. 163; Endl. gen. 'i4:i8. CONIOSELINUM. 



[ Name compounded of Conium and Selinnm.'] 



Calyx-teeth obsolete. Petals obcordate or obovate, with an inflexed point. Styles slender, 

 at length reflexed. Fruit convex or compressed on the back. Carpels with 5 winged ribs ; 

 the lateral ones twice as broad as the others, and marginal. Lateral intervals with 3 vittae ; 

 dorsal ones often with 2 vittje. Commissure with 4-8 unequal vittas. Carpophore 2- 

 parted. Seed flat on the face. — Biennial (and perennial ?) smooth herbs, with branching 

 and fistulous stems. Leaves with very large and inflated petioles, ternately divided ; the 

 divisions bipinnately parted, with oblong-linear lobes. Involucre none, or few-leaved. 

 Involucels of 5 - G linear-subulate leaves. Flowers white. 



1. CoNiosELiNUM Caivadense, T. 5)' G. (PI. XXXV.) Canadian Conioselinum. 



Fruit oval, nearly twice the length of the pedicels ; dorsal ridges narrowly winged. — Torr. 

 <J- Gr.Jl. N. Am. \. p. 619. Selinum Canadense, Michx.fl. 1. p. 165 ; Pursh,fl. \.p. 192. 

 Cnidium Canadense, Spreng. in Schult. syst. 6, p. 415 (excl. syn.) ; DC. prodr. 4. p. 153. 



Root perennial. Stem 3-5 feet high, terete, branching above, finely striate. Leaves with 

 inflated sheathing petioles, 3-parted, the divisions pinnately compound ; segments pinnalifid, 

 the lobes linear-oblong, acute. Umbel of 10 - 16 slender rays, which arc about two inches 

 long. Involucre none, or merely 1-3 small subulate leaflets. Involucels 5 — 6-leaved, 

 nearly as long as the umbellets. Styles slender, diverging. Calyx-teeth nearly obsolete. 

 Petals spreading, emarginate ; the point short and inflexed. Fruit about 3 lines long, com- 

 pressed on the back : dorsal ribs decidedly, though rather narrowly winged ; lateral ribs dilated 

 into a conspicuous wing. Vitta3 of the lateral intervals sometimes solitary, but usually 2 or 3 ; 

 those of the dorsal intervals often solitary, frequently 2 or even 3, sometimes running into 

 each other ; in the commissure at least 4, and sometimes several other shorter ones, besides 

 occasionally one in the margin of the wing. 



Swamps, usually in shady places. Oriskany, Oneida county ; and on the banks of Che- 

 nango River {Dr. Knieskern). Fl. August - September. Fr. October. 



Since the description of this plant in the Flora of North America was published, I have 

 obtained perfectly ripe fruit, and its resemblance to that of C. Fisheri is found to be very 

 close indeed ; the chief difference being in the breaddi of the dorsal ridges. 



35' 



