22 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
OIL TUBES DISTINCT. 
FRUIT STRONGLY FLATTENED DORSALLY, with lateral ribs more or less promi- 
nently winged. 
Oil tubes solitary in the intervals. 
Stylopodium conical. 
Slender and glabrous..................--2------------ Oxypolis, 192. 
Stout and pubescent, at least in the umbel. 
Leaves once or twice pinnate............---- Sphenosciadium, 127. 
Leaves large and ternately compound __._...-.---- Heracleum, 248. 
Stylopodium flat or wanting. 
Caulescent and branching. 
Flowers white. 
Slender; leaves pinnately dissected; dorsal ribs filiform. 
Lateral wings thick and prominent; Texan....Eurytaenia, 126. 
Lateral wings narrow; introduced ............---- Anethum, 255, 
Stout, leaves ternately or pinnately compound; dorsal ribs promi- 
nent .-.-.. 222.22 ee eee eee eee eee eee Angelica, 153. 
Flowers yellow. 
Dorsal ribs prominent ..................-..-.2----- Levisticum, 255. 
Dorsal ribs filiform ........2...... ween eee n eee eee Pastinaca, 255. 
Acaulescent, or nearly so. 
Stylopodium wanting; calyx teeth minute or obsolete; dorsal ribs 
filiform. 
Leaves ternate to dissected, with narrow or small leaflets. 
Lomatium, 204. 
Leaves once or twice compound, with broad and sharply toothed 
leaflets. 22-22-2222. ..2..202220222------ Euryptera, 240. 
Stylopodium flat but evident; calyx teeth evident; dorsal ribs sharp 
or winged. ...........------.----- Cynomarathrum, 244. 
Oil tubes more than one in the intervals. 
Caulescent and branching. 
Dorsal ribs obsolete; laterals corky-thickened; flowers yellow. 
Polytaenia, 191. 
Dorsal ribs prominent; laterals not corky-thickened; flowers white. 
Leaves ternately or pinnately compound. 
Leaves once ternate, with broad, stalked segments. 
Imperatoria, 255. 
Leaves more than once ternate or pinnate......... Angelica, 153. 
Leaves much more compounded...............- Conioselinum, 149. 
Acaulescent or nearly so. 
Lateral wings thin. 
.Stylopodium wanting; calyx teeth minute or obsolete; dorsal ribs 
filiform. 
Leaves ternate to dissected, with narrow or small leaflets. 
Lomatium, 204. 
Leaves once or twice compound, with broad and sharply toothed 
leaflets ........02...2.22-2-20222-2-.0-0- Euryptera, 240. 
Stylopodium flat but evident; calyx teeth evident; dorsal ribs sharp 
or winged ........-. eee eee eeeee Cynomarathrum, 244. 
Lateral - wings thick. 
Dorsal ribs very prominent or slightly winged. 
Pseudocymopterus, 187. 
Dorsal ribs filiform. 
Dwarf, with small pinnate or lobed leaves... ... Cymopterus, 179. 
Tall and stout, with large pinnately decompound leaves. 
Leptotaenia, 196. 
