282 UMBELLIFERiE. Osmorhiza. 



2. Osmorhiza brevistylis, DC. Spurious Sweet Cicely. 



Styles conical, their length scarcely equal to the breadth of the ovary ; fruit somewhat 

 tapering at the summit. — DC. prodr. 4. p. 232 ; Hook. fl. Bor.-Am. 1. p. 271. t. 97 ; Beck, 

 hot. p. 150; Darlingt.fl. Cest. p. 200; Torr. ^ Gr.fl. N. Am. 1. p. 639. Myrrhis Clay- 

 toni, Michx. fl. I. p. 170 ; Torr. fl. 1. p. 308, excluding most of the synonyms. Chaero- 

 phyllum Claytoni, Pers. syn. 1. ;*. 320. Uraspermum hirsutum, Bigel. fl. Bost. p. 112. 



Root sweetish, but rather nauseous, and without the anise-flavor of the preceding species. 

 Stem pale green, often hoary-pubescent when young, but finally (especially in shady places) 

 almost smooth. Leaves slightly hairy on both sides ; secondary divisions pinnatifid ; segments 

 oblong, incisely and sharply serrate. Umbel with longer rays than in the preceding species. 

 Involucre and involucels at length deciduous. Fruit shining, nearly black. 



Moist rocky woods. Fl. May. Fr. August. This species is much more common than 

 the preceding in the southern part of the State : both are frequent in the northern and western 

 counties. 



Tribe IX SMYRNIEjE. Koch; DC. 



Fruit turgid, mostly laterally compressed or contracted. Carpels loithflve ribs ; the lateral 

 ones marginal or placed opjwsite the margin, sometivnes nearly obliterated. Seed 

 involute, or sulcate 07i the face. — Umbels coinpound. 



19. CONIUM. Linn. ; Endl. gen. 4532. POISON HEMLOCK. 



[ " The koTiciun of Theophrastus ; from konos, a cone or top, whose wliirling motion resembles the giddiness produced on 

 the human constitution by the poisonous juice of this plant." Hooker.] 



Margin of the calyx obsolete. Petals obcordate, with a short inflexed point. Fruit ovoid, 

 compressed at the sides. Carpels with 5 prominent, equal, undulate or crenate ribs ; th^ 

 lateral ones marginal. Intervals without vitta;. Seed with a deep narrow groove on the 

 face. — Biennial, poisonous herbs. Root fusiform. Stem terete, branched. Leaves de- 

 compound. Involucre and involucels 3 — 5-leaved, the latter one-sided. Flowers white. 



1. CoNiuM MAcuLATUM, Linn. Common Poison Hemlock. 



Stem smooth, spotted ; segments of the leaves lanceolate, pinnatifid, the lobes acute ; leaflets 



of the involuccl lanceolate, shorter than the umbellets. — Linn. sp. 1. p. 243; Engl. bot. 



t. 1191 ; Pursh, fl. \.p. 195; Bigel. med. hot. I. p. 113. t. 11, and fl. Bost. p. 195; Torr. 



fl. l.p. 312; Hook. fl. Bor.-Atn. I. p. 272 ; Beck, bot. p. 150 ; Durlingt. fl. Cest. p. 201 ; 



Torr. <^ Gr. fl. N. Am. 1. p. 640. 



Root white and fleshy, often forked. Stem 2-4 feet high, much branched, striate and 

 spotted with purple. Leaves petiolate, bright green, ternately much divided ; ultimate lobes 

 about a line wide. Umbels terminal : rays numerous, about an incli long. Involucre and 



