30 



Slender and glabroub: loaves simply pinnate or re- 

 duced to petioles Tiedemannia, 10 



Stout and pubescent: leaves large andternately com- 

 pound Heracleitm, 1 1 



Stylopodiura depressed. 

 Caulescent and branching. 

 Flowers white. 



Slender: leaves pinnately dissected: dorsal ribs 



fdiform: Texan Et-kyt.jenia, (I 



Stout: leaves ternately or pinnately compound: 



dorsal ribs prominent .\n-geli('a, 7 



Stout: leaves pinnately decompound: dorsal ribs 



winged Selinxjm, S 



Flowers yellow Pastinaca, U 



Acaulescent or nearly so Pextcedanum, l(i 



Oil-tubes more than one in the intei'vals. 

 Caulescent and branching. 

 Dorsal ribs obsolete; laterals corky thickenecj: flow- 

 ers yellow POLYT.^^NIA, U 



Dorsal ribs prominent; laterals not corky thickened: 

 flowers white. 



Leaves ternately or pinnately compound Angelica, 7 



Leaves much more compounded Conioselinttm, i) 



Acaulescent or nearly so. 

 Lateral wings corky-thickened: dorsal ribs filiform. 



Dwarf, with small pinnate or lobed leaves Coi-optera, 14 



Tall and stout, with large pinnately decompound 



leaves Leptot.:Enia, 1."^ 



Lateral wings membranous: dorsal ribs filiform Pet'ceuanxim, Ki 



Lateral wings thickened; dorsal ribs very prominent 



or sUghtlv winged Pseudocymoptekus, 17 



* * Priiit lut strong-Iy Jiattcned dorsally [iisically some- 

 what laterally fattened). 



Oil-tubes none. 

 Seed-face concave. 

 Stylopodium conical. 



Fruit linear-oblong, glabrous Anthrischs, 38 



Fruit linear-oblong, bristly Osmokhiza, 41 



Fruit of nearly distinct globose carpels Bifoka, 4 



Stylopodium depressed. 



Leaves simple and perfoliate Bt'pIiEttrum, 39 



Leaves large and decompound Conium, 44 



Seed-face plane. 



Leaves simple and lobed: southwestern BowiiEsiA, 57 



Loaves biternate: Introduced at the east .Sgopodium, .'iti 



