UMBELLIFER^. (PARSLET FAMILY.) 161 



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

 acute, twice as long as the calj-x. (E. filiforme, *!5/(««/.) — Damp sandy soil 

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

 Leaves somewhat fleshy. Flowers very small, blue. 



5. DAUCUS, Toum. Carrot. 



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

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

 nual or biennial herbs, with pinnately finely dissected leaves and involucre, and 

 white or yellowish flowers. 



1. D. pusillus, Michx. Annual; stem rough with rigid reflexed hairs; 

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

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

 high. Umbels long-peduncled. 



6. CICUTA, L. Water-Hemlock. 



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

 tervals with single vittae, and 2 on the inner face. — Smooth perennial marsh 

 herbs, with hollow stems, and twice pinnately or ternately divided leaves. Invo- 

 lucels many-leaved. Flowers white. 



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

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

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



7. CRYPTOT^NIA, DC. 



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

 5-ribbed, with very slender single vittte 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. (Chaerophyllum Canadense, Pers.) — 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 vittse, and 2 on the fiice. — 

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

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



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

 leaves 2-3-pinnatifid, with the divisions filiform; umbel 3-4-raycd. (Sison 

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

 very small, roughened with minute scales. 

 14* 



