146 TJMBELLIFER^. 



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, scapif orm HYDROCOTYLE 1 



Stems trailing; peduncles short, not scape-like BOWLESIA 



Rigid, branching; leaves elongated, firm, setaceously 



toothed or lobed ...ERYNGIUM 3 



Umbels irregularly compound: fruit without 



ribs, subglobose, 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 3 in the intervals VEL^A 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 



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



flat on the face (ENANTHE 9 



Styles not elongated; oil-tube 1 to the interval: seed terete APIUM 10 



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



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



each interval CARUM 12 



Carpeln 5-angled; ribs slender; oil-tubes 



several to the interval PIMPINELXA 13 



Calyx with turgid border and no teeth FCENICULDM 14 



Ribs of carpel beset with hooked prickles; 



Seed nearly flat on the face DAUCUS 23 



Seed deeply channeled on the face CAUCALJS 24 



f attenuate at base MYRRHIS 20 



Carpels much elongated ] short-beaked CH^EROPHYLLUM 21 



'long-beaked ..SCANDIX 22 



Fruit not compressed; ribs corky (ENANTHE 



Fruit slightly compressed dorsally; some of the 



ribs narrowly winged SELJNUM 15 



Fruit strongly compressed dorsally and winged; 



Lateral wings broad; dorsal less prominent ANGELICA 16 



Lateral wings thick, corky: dorsal obscure LEPTOT^ENIA 17 



Lateral wings thin, coherent until maturity; 



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



Oil-tubes obnlavate, 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. 



