146 UMBELLIFER^. 



slender prolongation of the axis between these faces is called a carpo- 

 phore, which, in maturity, is apt to split into 2 branches, with a carpel 

 suspended from each. 



* Umbels simple, or imperfectly or irregularly compound. 



Low, flaccid; leaves simple; 



Stems creeping; peduncles erect, scapiform Hydrocotyle 1 



Stems trailing; peduncles short, not scape-like Bowlesia 2 



Rigid, branching; leaves elongated, firm, setaceously 



toothed or lobed Erykgium 3 



Umbels irregularly compound; fruit without 



ribs, snbglobose, prickly or tuberculate Sanicula 4 



* * Umbels regularly compound; leaves compound, often finely dissected- 



Fruit somewhat flattened laterally, not broadly winged; 



Oblong or rounded; oil-tubes 2 or S in the intervals Yel^ia 5 



Broadly ovate; ribs obtuse; oil-tubes none Conium 6 



Ovate or oblong; ribs corky; oil-tubes 2 or more Sium 7 



Broad-ovate or rounded; ribs broad; oil-tubes solitary — Cicuta 8 

 Styles elongated; oil-tube 1 in each interval; seed 



flat on the face CEnanthe 9 



Styles not elongated; oil-tube 1 to the interval: seed terete Apium 1U 



Fruit very small; ribs obscure: oil-tubes solitary Apiastrum 11 



Fruit ovate or oblong; ribs filiform; oil-tubes 1 to 



each interval Carum 12 



Carpels 5-augled; ribs slender; oil-tubes 



several to the interval Pimpinella 13 



Calyx with turgid border and no teeth Fceniculum 14 



Ribs of carpel beset with hooked prickles; 



Seed nearly flat on the face Daucus 23 



Seed deeply channeled on the face Caucalis 24 



( attenuate at base Myrrhis 20 



Carpels much elongated < short-beaked Chjerophyllttm 21 



' long-beaked Scandix 22 



Fruit not compressed; ribs corky CEnanthe 9 



Fruit slightly compressed dorsally; some of the 



ribs narrowly winged Selinum 15 



Fruit strongly compressed dorsally and winged; 



Lateral wings broad; dorsal less prominent Angelica 1& 



Lateral wings thick, corky: dorsal obscure Leptotjenia 17 



Lateral wings thin, coherent until maturity; 



Oil-tubes running the whole length of the carpel Peticedanum 18 



Oil-tubes obclavate, running from the apex to 



below the middle of the carpel Sphondylium 19 



1. HYDROCOTYLE, Tourn. (Marsh Pennywort). Low glabrous 

 herbs, growing in or near water, with creeping stems. Leaves rounded, 

 toothed or lobed, sometimes peltate; stipules scale-like. Flowers incon- 

 spicuous, in simple umbels, or in whorls one above another, on a scapi- 

 form erect peduncle. Calyx-teeth obsolete. Petals entire, acute. Fruit 

 flattened laterally, suborbicular, acutely margined, and with 2 or more 

 less prominent ribs or nerves on each side; oil-tubes 0; carpels coherent. 



