24 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Ribs conspicuously winged ....2....------------- Thaspium, 145. 
Ribs filiform. 
Tall and branching, with broad leaflets......-..-.---- Zizia, 90. 
Acaulescent and cespitose.........--...----------- Aletes, 106. 
Oil tubes more than one in the intervals. 
Stylopodium conical. 
Fruit round, with globose carpels and very slender inconspicuous ribs. 
Berula, 116. 
Fruit ovate to oblong. 
Fruit with prominent equal ribs........-.--------- Ligusticum, 129. 
Fruit with filiform or almost obsolete ribs. 
Involucre usually present; ribs equal and filiform..Eulophus, 110. 
Involucre usually wanting; ribs almost obsolete... .Pimpinella, 254. 
Stylopodium flat or wanting. 
Seed face sulcate or decidedly concave. 
Carpels flattened dorsally. 
Ribs filiform. ...........-2.2.----.-----------00-- Musineon, 76. 
Ribs with broad, thin wings..........-..---- Aulospermum, 174. 
Carpels terete or flattened laterally. 
Carpels terete. 
Seed face involute, inclosing a central cavity. 
Drudeophytum, 80. 
Seed face with a deep sulcus. 
Ribs filiform; calyx teeth obsolete ......... Museniopsis, 83. 
Ribs prominent and very acute; calyx teeth prominent. 
Deweya, 79. 
Carpels strongly flattened laterally -............-..... Erigenia, 73. 
Seed face plane, or but slightly concave. 
All the ribs conspicuously winged. 
Wings corky-thickened; tomentose seashore plants..Glehnia, 165. 
Wings thin; plants of the mountains and plains. 
Leaves pinnate, with short, crowded, and more or less confluent 
segments; flowers usually purple....-. Phellopterus, 166. 
Leaves ternate-pinnate, with short linear and more or less pun- 
gent segments; flowers usually yellow..... Pteryxia, 170. 
Ribs not winged. 
All the ribs filiform. 
Acaulescent, mountain plants. 
Flowers yellow; calyx teeth obsolete. ..... Hesperogenia, 75. 
Flowers white or pinkish; calyx teeth prominent. 
Podistera, 125. 
Caulescent, low-ground plants _............----- Taenidia, 109. 
Ribs corky, at least the laterals. 
Lateral ribs thick and corky, the dorsals filiform..Orogenia, 74. 
All the ribs corky and equally prominent. 
Fruit not flattened either way -.......... Coelopleurum, 140. 
Fruit flattened laterally. 
Oil tubes continuous about seed cavity....-. Bupleurum, 84. 
Oil tubes one to three in the intervals........... Sium, 114. 
