UMBELLIFERAE 159 
Leaves, at least some of them, cu;npound. 
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. Apiastrum. 
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. Sium. 
Fruits less than 2 mm. long with slender inconspic- 
uous ribs. : 10. Berula. 
’ Involeure of a few small bracts or wanting. 
Leaves ternately compound, flowers yellow, fruit 
nearly 4 mm. long. 6. Zizra. 
Leaves pinnately compound, flowers white, fruits 
2-8 mm. long. 7. Cicuta. 
Length of fruits 4-6 mm. 
Leaves ternately compound, leaflets broad. 
Leaves 3-parted, leaflets often incised, flowers white. 
8. Deringia. 
Leaves once to thrice ternate, leaflets merely ser- 
rate, flowers yellow. 6. Zizia. 
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. Phellopteris. 
Involucre wanting. 
Fruits 4-6 (7) mm. long. 
Both dorsal and lateral ribs broadly winged, flowers 
white. 14. Cymopxerts. 
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. 
