150 OMBELLIFEKjE. (rARSLET FAMILY.) 



18. BCTLEURUM. Flowers yellow. Fruit ovoid-oblong : the carpels somewhat 5-ribbed 



Leaves all simple. 



19. DJSOOl'LEUKA. Flowers white. Fruit ovoid : the lateral ribs united with a thick corky 



margin. Leaves cut into capillary divisions. 



20. CICUTA. Flowers white. Fruit subglobose, twin : the carpels strongly and equally 6- 



ribbed. Leaves twice or thrice ternate. 



21. SIUM. Flowers white. Fruit ovate-globose : the carpels 5-ribbed. Leaves all simply 



pinnate. 



22. CKVI'TOT.ENIA. Flowers white. Fruit oblong. Leaves 3-parted. Umbel irregular. 



II. Inner tare of the seed hollowed out lengthwise, or the margins involute, 



so that the cross-section is semilunar. (Umbels compound.) 



23. CILEIIOI'IIYLLL'M. Fruit linear-oblong, narrowed at the apex : ribs broad. 



24. OSMOKIUIIZA. Fruit linear-club-shaped, tapering below : ribs bristly. 



25. CON1UM. Fruit ovate, flattened at the sides : ribs prominent, wavy. 

 20. EULOPHUS. Fruit ovoid, somewhat twin, nearly destitute of ribs. 



III. Inner face of the seed hollowed in the middle, or curved inwards at 



the top and bottom, so that the section lengthwise is semilunar. 



27. ERIGKN1A. Fruit twin; carpels nearly kiduey -form. Umbellets few-flowered. 



1. HYDROCOTYLE, Tourn. Wate* Pekny wobt. 



Calyx-teeth obsolete. Fruit flattened laterally, orbicular or shield-shaped, 

 the carpels 5-ribbed, two of the ribs enlarged ami often forming a thickened 

 margin: oil-tubes none. — Low and smooth marsh perennials, with slender 

 steins creeping or rooting in the mud, and round shield-shaped or kidney-form 

 leaves. Flowers small, white, in simple umbels or clusters, which are either 

 single or proliferous, appearing all summer. (Name from v8u>p, water, and 

 kotiXt), a jha cup, the peltate leaves of several species being somewhat cup- 

 shaped.) 



* Stems procumbent and brandling : flowers 3-5 in a sessile cluster. 



1. II. Americana, L. Leaves rounded kidney-form, doubly crenate, 

 somewhat lobed, short-pctiolcd ; fruit orbicular. — Shady springy places ; com- 

 mon northward. 



* * Umbels on scape-like naked peduncles, arising, with the long-pet ioled leaves, from 

 the joints of creeping and rooting stems. 



2. II. ramitlCUloidcS, L. Leaves round-rcnifurm, 3- 5-<7< 'ft, the lobes 

 crenate; peduncles much shorter than the petioles; umbel 5- 1 0-flowered ; ped- 

 icels very short; fruit orbicular, scarcely ribbed. — Penn. and southward. 



8. II. intcrrispta, Muhl. Leaves peltate in the middle, orbicular cre- 

 nate ; peduncles about the length of the leaves, bearing clusters of few and sessile 

 flowers interruptedly along its length ; fruit broader than long, notched at the 

 base. — New Bedford, Massachusetts, and southward along the coast. 



4. II. llinbollata, L. Leaves peltate in the middle, orbicular, notched 

 at the base, doubly crenate; peduncle elongated (3' -9' high), bearing a many- 

 flowered umbel (sometimes proliferous with 2 or 3 umbels); pedicels slender; 

 fruit notched at the base and apex. Massachusetts and southward near the 

 coast. 



