106 DICOTYLEDOXOUS. 



lucre many leaved, subulate, persistent ; involucel similar, but smaller. Flow- 

 ers sessile ; filaments red near the summit. Seeds compressed. 

 White. J*. Aug.— Sept. Middle Georgia. 3-6 feet. 



Genus XVII. ARCHEMORA. 



Li?nh of the calyx 5-toothed. Petals obcordate with an inflex- 

 ed point. Fruit somewhat eliptic lenticularly compressed. Car- 

 pels ribbed, lateral ones dilated. Perennial aquatic herbs. 

 Involucre wanting or few leaved ; involucels many leaved. 



1. A. RiGiDA. Stem erect, rigid, terete, striate fistulous. Leaves pinnate- 

 ly divided ; segments ovate, oblong, remotely toothed, or entire, with a car- 

 taliginous margin. Umbel of many slender rays. Fruit with the dorsal 

 ribs greenish, lateral ones with a membranaceous margin. 



White. %. Sept. Georgia— Florida. 3-5 feet. 



2. A. Terxata. Stem striate, slender. Leaves ternately divided, on long 

 petioles ; segments linear, acute, entire, alternate. Involucre nearly wan- 

 ting; involucel 5-6 leaved, i^rui^ oblong eliptic, surrounded with a thick 

 win fired margin. 



"White. %. Middle Car. & Geo. 2-3 feet. 



Gexcs XVIIl. DAUCUS. 



Margin of the calyx S-toothed. Petals obovate, emargin- 

 ate, with an inflexed point, the exterior ones often larger, and 

 deeply 2.cleft. Fruit compressed, ovate or oblong. Carpels 

 with 5 iiliform, bristly ribs. Biennial plants, with pinnately 

 divided leaves. 



1. D. Carota. Root fusiform. Stem hispid, branching. Leaves 2-3 pin- 

 natified ; segments pinnatifid, with lanceolate, cuspidate lobes. Involucre 

 consisting of pinnatifid leaves, about the length of the umbel. Umbels con- 

 cave, the central one of each secondary one abortive. Carrot. 



Yellow. (^. Naturalized. 



2. D. PusiLLus. »S^em retrorsely hispid, ieares bipinn ate, with pinnatifid 

 segments, with narrow, linear lobes ; leaves of the involucre bi-pinnatifid. 

 Seeds muricate, with 8 crested ribs. 



Greenish yellow. ^. May — July. Common in middle Ga. 1-2 feet. 



Genus XiX. CH.EROPHYLLUM. 



Limb of the calyx obsolete. Petals cordate emarginate, 

 with an inflexed point. Fruit compressed. Carpels ribbed. 

 Seed convex. Leaves compound, with toothed or many cleft 

 segments. Involucel many leaved. 



1. C. Procumbens. Stem decumbent, glabrous, small. Leaves alternate, 

 bi-pinnately divided ; segments pinnatifid, divisions lanceolate, mucronate. 

 Involucre none. Umbels usually sessile, opposite the leaves, consisting of 2-4 

 rays ; involucels 4-5-leaved. Fruit oblong, striate pointed at the summit. 

 White. #. April — May. Shady places. 6-18 inches. 



Genus XX. OSMORHIZA. 

 Margin of the calyx obsolete. Petals oblong, with an in- 



