UMBELLIFER^E. (PARSLEY FAMILY.) 157 



2O. CICtJTA, L. WATER HEMLOCK. 



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

 the carpels with 5 flattish 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 white. 

 (The ancient Latin name of the Hemlock.) 



1. C. maciilata, L. (SPOTTED COWBANE. MCSQUASH-KOOT. BEA- 

 VER-Poisox.) Stem streaked with purple, stout ; leaflets oblong-lanceolate, 

 coarsely sen-ate, sometimes lobed, pointed. Swamps, common. Aug. Plant 

 8 - 6 high, coarse ; the root a deadly poison. 



2. C. Imlfoifera, L. Leaflets linear, remotely toothed or cut-lobed ; upper 

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

 ing fruit. 



21. SlUJfl, L. WATER PARSNIP. 



Calyx-teeth small or obsolete. Fruit ovate or globular, flattish 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 

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

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

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

 * Pericarp thin betiveen 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 

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



- Sept. 



S. LATIFOLIUM, L., of Europe, I have never seen in tiiis region. 



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



quite marginal. (Bemla, Koch.) 



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

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

 and westward. (Eu.) 



22. CRYPTOT^NIA, DC. HOXEWORT. 



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 KpvTrro?, hidden, and ram'a, 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. 



