KEY. 163 



301. Seed loose in the cell, covered witli vittae. 



Archangelica. 

 Seed not loose , ^ 302 



30^. Carpels with 3 wings on the back, half as narrow 

 as those of the margins. Fruit longer than the pedicels. 

 Leaves twice- to thrice-pinnate ; leaflets pinnately-cleft. 

 Calyx-teeth obsolete. 



Conioselinum Canadense, Torr. & Gr. 

 Marginal and dorsal wings alike. Involucre none 

 or scanty. Involucels many-bracted, small. Petioles mem- 

 branaceous at the base. Leaves twice ternate, or the divi- 

 sions quinate ; leaflets dentate. Calyx-teeth obsolete. 



Angelica Curtisii, Buckley. 



303. Fruit flattened laterally, or contracted at the 

 sides, wingless 304 



Fruit not flattened either dorsally or laterally, at 

 least not remarkably so. Cross-section of the fruit nearly 

 orbicular, or square. Each carpel with 5 wings or strong 

 ribs 309 



304. Flowers yellow. Involucre none 305 



Flowers white 306 



305. Fruit oval, somewhat twin. Leaves twice- to 

 thrice-ternate ; leaflets entire. Calyx-teeth obsolete. 



Zizia integerrima; D. C. 

 Fruit ovoid-oblong. Leaves all simple, entire, 

 broadly ovate, perfoliate. Calyx-teeth obsolete. 



Bupleunun rotuudif olium, L. 



306. Involucre none, or almost none 307 



Involucre of 2 to 8 bracts 308 



307. Fruit broader than long. Involucels many- 

 bracted. Leaves thrice-pinnate or ternate; veins of the 

 leaflets terminating in the notches. Cicuta. 



Fruit elliptic-oblong. Leaves large, 3-foliolate, 

 serrate. Involucels few-leaved. Calyx-teeth obsolete. 



Cr3rptot3enia Canadensis, D. C. 



308. Calyx-teeth obsolete. Leaves pinnate, with serrate 

 leaflets. Sium. 



Calyx-teeth subulate. The leaflets bristle-form. 



Discopleura. 



