31 



Oil-tubes solitary iii tlio intervals. 

 Stylopodiuin conical. 



Leaflets (at least the upper) linear t(< lilifomi. 

 Involucre wanting: introduced. 



Flowers white Cokiandkitm, .i 



Flowers yellow FoiniccIjUM, 32 



Involucre present: (lowers white (e.\cei)ting Aninio- 

 Me'inuin). 

 Low and difl'use, with ternatcly divided leaves. . .\MMOsEiiiNiM, :il 

 Leaves finely nissected. 

 Fruit linear-oblong: invohicral bracis few and 



linear TREPOcAKPrs, 3 



Fruit ovate: involucre foliaeeous DiscopLErRA, 54 



Fruit ovate, tuberculate Leptoc.vulis. 53 



Leaves with few leallets. 



Lateral ribs thick and corky: southern Cyxohciadium, 2S 



Hibs all fUiform: western Carum, 50 



Leallets broader. 



Seed-face concavt; Ch.*:kophyllim, 40 



Seed face plane. 



Fruit oblong to orbicular Ck'UTA, 51 



Fruit linoar-oblong Oryptot^nia, 52 



Stylopodiuni depressed. 

 Flowers white. 



Fruit with all the ribs conspicuously winged Cymopterus, 1»; 



Fruit with ecjual, broad and corky ribs, and no 

 strengthening cells. 

 Fruit small ( not ovej- a line loiigi. flattened later- 

 ally Apxim, 4(i 



Fruit larger, ovoid-globose -Ethusa, 2:5 



Fruit with thick corky lateral libsand filiforni dor- 

 sals, all with strengthening cellb: aquatic 



Leaves reduced to hollow jointed petioles Crantzia, 2(5 



Leaves pinnate or decompound: western CEnanthe, 27 



Fruit with obscure or obsolete ribs Api.\strum, 35 



Flowers yellow. 



Fruit with ribs conspicuously winged. 



Low and often cespitoso. with finely divided 



leaves: western Cymoi-teris. 1^ 



Tall and branching, with largei-. more coarsely 



divided leaves Thaspum, 20 



Fruit with eijual, broad and ct)rky ribs: Rocky Mts. 



Low, eespitose: high alpine Oreoxis, 22 



Foot or more high: in the foot-hills •. .Harbouria. 47 



Fruit with filiform tibs. 

 Tall and branching, with broad leallets: mostly 



f astern Zizia. 4!) 



