UMBELLIFERAE 159 



Leaves, at least seme of them, compound. 

 Fruits bristly. 3-7 mm. long. 



Bristly on the wings only, flowers white or pink, with the central 

 one purple. 21. Daucus. 



Bristly all over with hooked bristles. 1. Sanicula. 



Fruits not bristly, sometimes tuberculate. 

 Fruits not strongly flattened dorsally. 

 Fruits about 12 mm. long, 2 mm. wide, umbels few-rayed, 

 flowers white. 3. Washingtonia. 



Fruits not over 7 mm. long. 



Fruits tuberculate, less than 2 mm. long. 4. Apiastrunfi. 



Fruits not tuberculate, 2 mm. or more long. 

 Plants acaulescent, or low and decumbent or ascending less 

 than 3 dm. high. 

 Fruits not winged, 2-4 mm. long. 5. Musineon. 



Fruits broadly winged, 6 mm. long. 14. Cymopteris. 



Plants with erect leafy stems, 3-20 dm. high. 

 Fruits not broadly winged. 



Length of fruits less than 4 mm., flowers white. 

 Involucres of numerous bracts. 



Fruits 3 mm. long with prominent ribs. 9. Slum. 

 Fruits less than 2 mm. long with slender inconspic- 

 uous ribs. 10. Berula. 

 Involcure of a few small bracts or wanting. 



Leaves temately compound, flowers yellow, fruit 



nearly 4 mm. long. 6. Zlzia. 



Leaves pinnately compound, flowers white, fruits 



2-3 mm. long. 7. Cicuta. 



Length of fruits 4-6 mm. 



Leaves ternately compound, leaflets broad. 

 Leaves 3-parted, leaflets often incisd, flowers white. 



8. Derlngla. 

 Leaves once to thrice ternate, leaflets merely ser- 

 rate, flowers yellow, 6. Zlzia. 

 Leaves dissected into capillary segments, flowers 

 yellow. 11. Foeniculum. 

 Fruit with 7-10 of its ribs broadly winged. 12. Thaspium. 



Fruits strongly flattened dorsally ,carpels usually with marginal 

 wings. 

 Plants acaulescent or nearly so. 



Involucre present, flowers white. 15. Phellopterls. 



Involucre wanting. 



Fruits 4-6 (7) mm. long. 



Both dorsal and lateral ribs broadly winged, flowers 

 white. 14. Cymopterrs. 



Only the lateral ribs winged. ' 17. Lomatium. 



Fruits 8-12 mm. long, 4 mm. wide, flowers yellow. 



18. Cynomarathrum. 

 Plants with tall erect leafy stems. 



Fruits about 4 mm. long; leaves pinnately decompound; 

 flowers white. 13. Conioselinum. 



Fruits 5-12 mm. long. 



