254 



AMMIACEAE. 



20. 



19. 



EURYPTERA. 

 COGSWELLIA. 



Bristles barbed at tip. 22. Daucus. 



Bristles short, neither hooked nor 



barbed. 5. Osmorhiza. 



Bristles hooked. 6. Caucalis. 



Fruit not bristly. 



Oil-tubes obsolete or obscure. 



Leaves decompound. 8. Conium. 



Leaves simple. 



Fruit strongly flattened later- 

 ally. 1. Hydrocotyle. 

 Fruit not strongly flattened 



laterally. 2. Bowlesia. 



Oil-tubes distinct. 



Fruit strongly flattened dorsally. 

 Flowers white. 



Caulescent. 18. Sphenosciadium. 



Acaulescent or nearly so. 19. Cogswellia. 

 Flowers yellow. 



Plants leafy-stemmed. 21. Pastinaca. 



Plants with mostly basal 

 leaves. 

 Leaflets large, sharply 



toothed. 

 Leaflets narrow or small, 

 not sharply toothed. 

 Fruit not strongly flattened dor- 

 sally, usually flattened later- 

 ally. 

 Oil-tubes solitary in the inter- 

 vals. 

 Stylopodium conical. 



Flowers yellow. 17. Foeniculum. 



Flowers white. 



Leaflets, at least the 

 upper, linear or fili- 

 form. 13. Carum. 

 Leaflets broader. 12. Cicuta. 

 Stylopodium flat or wanting. 

 Ribs thick and corky. 



Dorsal ribs filiform. 16. Oenanthe. 

 All the ribs promi- 

 nent and corky, 11. Apium. 

 Ribs obscure or obsolete. 7. Apiastrum. 

 Oil-tubes more than 1 in the 

 intervals. 

 Stylopodium conic. 15. Berula. 



Stylopodium flat or wanting. 

 Seed-face involute, in- 

 closing a central cav- 

 ity. 10. Drudeophytum. 

 Seed face deeply sulcate. 9. Deweya. 

 Seed-face plane. 14. Sium. 



