182 UMBELLIFEU.E. (PARSI.KV KAMn.V.) 



21. POLYT^NIA, l»('. 

 Calyx 5-11)111110(1. Fruit oval, i()iii])r«'ss<il, ilic iiiar^ijiiis tliickened; carpels 

 ohsi'iirt'ly rildifd, with two vitta; in the iiitcr\als, and six on the t'oininissurt'. 

 — AsniDDih Ipitimial '. herb, with j)iiiuately divideil leaves, and yelhjw Howers. 



1. P. Nuttallii, DC. Stem ereet from a tliitk tap-root, l°-3° hif,'h ; 

 loaves :2 - .'3-))iiinate, witii coarse toothed lolies, the upper opposite, 3-parted ; 

 inviilucri' none; iuviilncels liristiv. — Al.-ihania, Tenncs.see, and ucst«ard- 

 April. 



22. TREPOCARPUS, Nutt. 



Calyx teeth suljulate, deciduous. Fruit lincarolilong, acute, nearly terete, 

 8-augled ; carpels 4 ribbed, each rib covering a single vitta. Commissure 

 spougy, grooved in tiie middle, witli two minute vittaj next the seed. — A 

 smooth annual, with 3-pinuately tinely dissected leaves, and S-.O-rayed long- 

 l)eilunclcd unil)els. 



1. T. JEthusa, Nutt. — Low lianks near Mobile (Mohr). — Stem 2° high. 

 I'ediuicles longer tlian tlie leaves. Flowers white. 



23. DAUCXJS, Touru. Carrot. 



Calyx 5-toothed. Corolla irregular. Fruit ovate or oblong. Carpels with 

 3 jiriinary inconspicuous ribs, ciliate on the back, and one at each margin 

 witliin, and 4 secondary wings divided into barbed prickles, with a single 

 vitta under each, and 2 on the inner face. — Annual or biennial lierbs, witli 

 2-3pinuately finely divided leaves, many-leaved involucres and involucels, 

 and white or yellowish flowers. Fruiting umbels concave at the top. 



1. D. Carota, L. Stem 2°-4° high, hirsute; fruit oldong; wings of 

 the carpels divided to the base into 12 or more bristly prickles. — Waste 

 places. Iiii rod need. 



2. D. pusilla, Michx. Stem ^''-2= high, bri.^tly ; frnit oblong-ovate; 

 wings of the carpels deeply parted into 6-8 flattened prickles; umbel I' -2' 

 wide. — Sandy old fields. May - June. 



24. CHJEROPHYLLUM, L. 



Calyx teeth obsolete. Fruit oblong or linear, tapering at the apex, con- 

 tracte<l at the sides. Carpels (loo])ly furrowed on the commissure, witli .5 

 obtuse equal ribs. Intervals with single vittaj, — Herbs, with compound 

 finely dissected leaves, and white liowers. Involucre few-leaved or none. In- 

 volucel many-leaved. 



1. C. procumbens, Lam. Stem weak, .slightly pubescent ; leaves ter- 

 nately divided; the divisions bipiunatifid, with oblong obtuse lolies; umbel 

 sessile, of 2-3 long rays; involucel 4-.5-leaved, few-flowered; fruit oblong, 

 abruptly pointed, finely ribbed. — Shady river banks. April -May. (l) or 

 (2) — Stems C - 1 8' long. 



2. C. Teinturieri, Hook. & Arn. More pubescent ; lobes of the leaves 

 narrower and aculo ; fruit oblong-linear, more strongly ribbed and tajieriiig 

 at the apex; otherwi.se like the last. — Banks of the Apalacliicola Kiver, 

 Florida, and westward. March - Ajiril. — Stem erect, 1° higli. 



