Family UMBELLIFERAs 165 
2. UMBELLIFER2. 
Carrot Family. 
Leaves simple; flowers in dense capitate clusters, white or blue. 
2. Eryngium. 
Leaves, at least some 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. 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. 
Perennials; fruits 2-4 mm. long. 5. Musineon. 
Annuals, ours with procumbent stems. 
22. Chaerophyllum. 
Fruits broadly winged 6 mm. long. 14. Cymopterus. 
Plants with erect leafy stems, 3-20 dm. high. 
Fruits not broadly winged. 
Length of fruits less than 4 mm. 
Involucres of numerous bracts. 
Fruits 3 mm. long with prominentribs. 9. Sium. 
Fruits less than 2 mm. long with slender in- 
conspicuous ribs. 10. Berula. 
Involucre of a few small bracts or wanting. 
Leaves ternately compound; serrate; flowers 
yellow. 6. Zizia. 
Leaves pinnately compound; flowers. white; 
fruits 2-3 mm. long, rhizome and roots 
tuberous. 7. Cicuta. 
Length of fruits 4-6 mm. 
Leaves ternately compound, leaflets broad. 
Leaves 3-parted, leaflets often incised: flowers 
white. 8. Deringa. 
Leaves once to thrice ternate, leaflets merely 
serrate; 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 mar- 
ginal wings. 
Plants acaulescent or nearly so. 
Involucre present; flowers white. 15. Phellopterus. 
Involucre wanting. 
Fruits 4-6 (7) mm. long. 
Both dorsal and lateral ribs broadly winged; flowers 
white. 14. Cymopterus. 
