UMBELLIFEK^E. 623 



ORDER UMBELLIFERJ3. 

 LEPTOCAULIS, Nutt. 



L. echinatus, Nutt. Leaves, &c. as in L. divaricatus, but the fruit 

 beset with rigid spreading hooked bristles. Mobile (Mohr) and westward. 



HELOSCIADIUM, Koch. 



H. leptophyllum, DC. Stem erect or diffuse ; leaves ternately or 

 biternately divided, the divisions linear or setaceous ; umbels nearly sessile, 

 1-3-rayed; involucre and involucel none; fruit ovate. East Florida, and 

 westward. Introduced. Stem -2 high. Fruit very small. 



CYNOSCIADIUM, DC. 



Calyx-teeth subulate. Fruit ovate, terete. Carpels with 5 obtuse ribs, 

 the two lateral ribs united with the thick corky margin. Intervals with sin- 

 gle vitta?. Smooth annuals, with finely divided leaves, and very small white 

 flowers. Leaves of the involucre few or none. 



C. pinnatum, DC. Leaves pinnately divided into few long linear seg- 

 ments ; petals roundish, obtuse ; fruit ovate-oblong, the ribs not prominent. 

 Alabama (Prof. E. A. Smith), and westward. August. JStem 6' - 12' high. 

 Lowest leaves often entire. 



POLYTJENIA, DC. 



Calyx 5-toothed. Fruit oval, compressed, the margins thickened ; carpels 

 obscurely ribbed, with two vittae in the intervals, and six on the commis- 

 sure. A smooth biennial 1 herb, with pinnately divided leaves, and yellow 

 flowers. 



P. Nuttallii, DC. St. Tammany Parish, Louisiana (Mohr), Tennessee 

 (Dr. Gattinger). April. Stem l-2 high. Upper leaves opposite. 



TREPOCARPTTS, Nutt. 



Calyx-teeth subulate, deciduous. Fruit linear-oblong, acute, nearly terete, 

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

 spongy, grooved in the middle, with two minute vittse next the seed. A 

 smooth annual, with 3-pinnately finely dissected leaves, and 3 - 5-rayed long- 

 peduncled umbels. 



T. JEthusa, Nutt. Low banks near Mobile (Mohr). Stem 2 high. 

 Peduncles longer than the leaves. Flowers white. 



ERIGENIA, Nutt. 



Calyx-teeth obsolete. Petals obovate. Fruit didymous, the carpels kid- 

 ney-shaped, incurved at each end, with 5 slender ribs ; intervals with several 

 vittae. A low (6'- 10' high) smooth herb from a deep round tuber; the 



