UHBELL1EER.X. (PARSLEY FAMILY.) 157 



20. CICUTA, L. Watek Hemlock. 



Calyx minutely 5 toothed. Fruit subglobose, a little contracted at the sides, 

 the carpels with 5 flatfish and strong ribs : intervals with single oil-tubes. — 

 Marsh perennials, very poisonous, smooth, with thrice pinnately or ternately 

 compound leaves, the veins of the lanceolate or oblong leaflets terminating in 

 the notches. Involucre few-leaved : involucels many-leaved. Flowers wliite. 

 (The ancient Latin name of the Hemlock.) 



1. C nuscaalista, L. (Spotted Cowbane. Musquash-root. Bea- 

 ver-Poison.) Stem streaked with purple, stout ; leaflets oblong-lanceolate, 

 coarsely senate, sometimes lobed, pointed. — Swamps, common. Aug. — Plant 

 3° - 6° high, coarse ; the root a deadly poison. 



2. C. 1)Ulbit'era, L. Leaflets linear, remotely toothed or cut-lobed ; upper 

 axils bearing dusters of bulUets. — Swamps ; common northward : seldom ripen- 

 ing fruit. 



21. SiUM, L. Water Parsnip. 



Calyx-teeth small or obsolete. Fruit ovate or globular, flatfish or contracted 

 at the sides; the carpels with 5 rather obtuse ribs: intervals with 1 -several 

 oil-tubes. — Marsh or aquatic perennials, smooth, poisonous, with grooved 

 Btems, simply pinnate leaves, and lanceolate serrate leaflets, or the immersed 

 ones cut into capillary divisions. Involucre several-leaved. Flowers white. 

 (Name supposed to be from the Celtic siu, water, from their habitation.) 



# Pericarp thin between the strong projecting ribs : lateral ribs marginal. 



1. S. lineare, Michx. Leaflets linear, lanceolate or oblong-lanceolate, 

 tapering gradually to a sharp point, closely and very sharply serrate ; calyx- 

 teeth scarcely any; fruit globular, with corky and very salient ribs, or rather 

 wings; oil-tubes 1 - 3 in each interval. — Swamps and brooks; common. July 

 -Sept. 



S. latifolium, L., of Europe, I have never seen in tins region. 



* Pericarp of a thick texture, concealing the oil-tubes : ribs not strong, the lateral not 

 quite marginal. (Berula, Koch.) 



2. S. angMStifolilim, L. Low (9' -20' high); leaflets varying from 

 oblong to linear, mostly cut-toothed and cleft ; fruit somewhat twin. — Michigan 

 and westward. (Eu.) 



22. CRYPTOTJENIA, DC. Hone wort. 



Calyx-teeth obsolete. Fruit oblong, contracted at the sides; the carpels 

 equally and obtusely 5-ribbed : oil-tubes very slender, one in each interval and 

 one under each rib. Seed slightly concave on the inner face. — A perennial 

 smooth herb, with thin 3-foliolate leaves, the umbels and umbellets with very 

 unequal rays, no involucre, and few-leaved involucels. Flowers white. (Name 

 composed of kovtttos, hidden, and raivla, a fillet, from the concealed oil-tubes.) 



1. C. Canadensis, DC. — Rich woods, common. June -Sept. — Plant 

 2° high. Leaflets large, ovate, pointed, doubly serrate, the lower ones lobed. 



