UMBBLLIFBE^. 623 



Ordee UMBELLIFER^. 



LEPTOCAULIS, Nutt. 



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

 beset with rigid spreading hooked bristles. — Mobile (Mo/ir) 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 J" -2° high. Fruit very small. 



CYWOSCIADIUM, DC. 



Calyx-teeth subulate. Fruit ovate, terete. Carpels with 6 obtuse ribs, 

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

 gle vittae. — 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. — Stem 6' -12' high. 

 Lowest leaves often entire. 



POLYT.^NIA, DC. 



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

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

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

 flowers. 



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

 {Dr. Gattinger). April. — Stem 1°- 2° high. Upper leaves opposite. 



TBEPOCARPUS, 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 vittae next the seed. — A 

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

 peduncled umbels. 



T. .Sjthusa, Nutt. — Low banks near Mobile (Mahr). — Stem 2° high. 

 Peduncles longer than the leaves. Flowers white. 



EEIGENIA, 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 (O'-IO' high) smooth Kerb from a deep round tuber; the 



