UMBELLIFER.E. (PARSLEY FAMILY.) 161 



of the involucre subulate, as long as the hemispherical head ; bracts subulate 

 acute, twice as long as the cah'x. (E. iWitovmc, S/iuttl.) — Damp sandy soil 

 along the coast of West Florida. July and August. (5) — Stems 1° -2° long. 

 Leaves somewhat fleshy. Flowers very small, blue. 



5. CAUCUS, Tourn. Carrot. 



Calyx 5-toothed. Corolla irregular. Fruit ovate or oblong ; the carpels with 

 9 unequal bristly or prickly ribs, and a single vitta under the larger ribs. — An- 

 nual or biennial herbs, witli pinnatcly finely dissected leaves and involucre, and 

 white or yellowish flowers. 



1. D. pusillus, Michx. Annual; stem rough with rigid rcflexed liairs ; 

 leaves twice pinnate, with the divisions linear; bristles of the fruit barbed. — 

 Dry sterile soil, Florida to South Carolina, and westward. June. — Stem 1° - 3° 

 high. Umbels long-pedunclcd. 



6. CICUTA, L. Water-Hemlock. 



Calyx .5-toothed. Fiiiit roundish. Carpels witli 5 flattish equal ribs ; the in- 

 tervals with single vittoe, and 2 on the inner face. — Smooth perennial marsli 

 herbs, with hollow stems, and twice pinnatcly or ternately divided leaves. luvo- 

 lucels many-leaved. Flowers white. 



1. C. maeulata, L. Stem large (.3° -6° high), purplish; leaflets ovate- 

 lanceolate, acute, coarsely serrate ; umbels large, many-rayed. — Marshes, Florida 

 to Mississippi, and northward. July. — Plant very poisonous. 



7. CKYPTOT^NIA, , DC. 



Calyx-teeth obsolete. Fruit oblong, contracted .it the sides. Carpels equally 

 5-ribbed, with very slender single vitta; in each interval, and one under each rib. 

 — A smooth perennial herb, with trifoliolate leaves on long petioles. Leaflets 

 large, ovate, doubly serrate and mostly lobcd. Rays of the umbel few and very 

 unequal. Involucre none. Involucels filiform. Flowers white. 



1. C. Canadensis, DC (Cha^rophyllum Canadcnsc, Prr.^.) — Rich 

 shady soil, North Carolina to Mississippi, and northward. July. — Stem 2° high. 



8. LEPTOCAULIS, Nutt. 



Calyx-teeth obsolete. Fruit ovate, compressed on the sides, often rough or 

 bristly. Carpels 5-ribbed, the intervals with single vittae, and 2 on the face. — 

 Slender smooth herbs, with finely dissected leaves, and white flowers. Umbels 

 few-rayed. Involucre none. Involucel few-leaved. 



1. L. divaricatUS, DC. Annual; stem (6' -18' high) widely branched ; 

 leaves 2-3-pinnatifid, with the divisions filiform; uml)cl 3-4-rayed. (Sison 

 pusillum, Michx.) — Dry sandy soil, Florida to North Caroliua. April. — Fruit 

 very small, roughened with minute scales. 

 14* 



