UMBELLIFER^E. 



233 



the ovary. Stamens 5, alternate with the petals. Ovary of 2 

 united carpels, 2-celled, with I ovule in each cell. Styles 2, dis- 

 tinct, or united and thickened at the base. Fruit consisting of 2 

 dry carpels, which adhere by their opposite faces (commissure) 

 to a common axis (carpophore), at length separating, and sus- 

 pended from the forked summit of the carpophore. Each carpel 

 is indehiscent, mar.ked with 5 longitudinal primary ribs, and often 

 with secondary ones alternate with the first. In the substance of 

 the pericarp, little oil-tubes (vittce) are usually imbedded opposite 

 the intervals between the ribs, or opposite the ribs themselves. 



{ Flowers in simple umbels Hydrocotyle, 



f Fruit prickly Sanicula, 

 f Flowers greenish-^ 



[ Fruit not prickly Archangelica. 



( Leaves 3-parted Cryptotcemia. 

 \ Leaves (lower) pinnately parted Apium. 

 Leaves bi-pinnatifid Carum. 



Flowers 

 in com- 

 pound 

 umbels. 



f Calyx teeth | 

 obsolete -{ 



Flowers 

 white 



Flowers yellow 



Leaves bi-ternately divided Osmorhiza. 



Leaves bi- or tri-ternately decompound Co- 

 nium. 



f Leaves pinnate Stum. 

 Calyx teeth small < 



[ Leaves ternately parted Hera.leum. 



f Fruit with prickles Daucus. 

 Calyx teeth broad 4 



[Fruit smooth Cicuta. 



[Calyx with distinct tube Coriandrum. 

 f Fruit winged Pastinaca. 

 [Fruit not winged Faeniculum. 



1. Hydrocotyle. Calyx obsolete. Petals ovate, entire, acute, 

 spreading, with the point not inflexed. Fruit flattened laterally, with 

 a narrow commissure. Carpels without vittae. ^ 



H. AMERICANA (Penny-wort). Smooth and shining ; stem branching, 

 often decumbent ; leaves orbicular-reniform, somewhat lobed, doubly cre- 

 nate ; flowers minute, greenish, in axillary, sessile, few-flowered, greenish, 

 capitate umbels ; fruit very minute, orbicular. In wet places. 2-4' long. 

 June- A ugust. 



2. Sanicula. Flowers polygamous. Calyx-tube echinate. Petals 

 obovate, erect, with a long inflexed point. Fruit sub-globose, armed with 

 hooked prickles. Carpels not ribbed, furnished with numerous vittse. y. 



S. MARILANDICA (Sanicle). Leaves digitately 5-y-parted ; segments ob- 

 long, incisely serrate ; cauline leaves few, nearly sessile ; flowers greenish, 



