Voi,. II.] CARROT FAMILY. 509 



Fruit winged or wingless, not flattened either dorsally or laterally. 



All its ribs winged n. Cymopterus. 



Ribs distinct, but not winged. 



Leaves finely dissected; segments narrow. 14. AEthusa. 



Leaf -segments broad. 



Fruit with numerous oil-tubes between the ribs. 13. Ligusticum. 



Fruit with solitary oil-tubes between the ribs. 15. Coelopleurum. 



Leaves entire, or with a few narrow segments. 17. Cynosciadium. 



Fruit laterally flattened. 



Fruit linear or linear-oblong. 



Leaves 3-foliolate, 37. Deringa. 



Leaves decompound or finely dissected. 



Fruit long-beaked, smooth, ribless. 26. Anthriscus. 



Fruit short-beaked or beakless, ribbed. 28. Chaerophyllum . 



Fruit ovoid or oval. 



Umbels opposite the leaves. 33. Apium. 



Umbels terminal or axillary. 



Leaves finely dissected into filiform segments. 



Ribs of the fruit equal, prominent. 39. Ptilimnium. 



Lateral ribs much thickened. 33. Apium, 



Ribs filiform, inconspicuous. 35. Carum, 



Leaves pinnate or decompound; segments linear to ovate-oblong. 

 Plants acaulescent, or nearly so. 



Calyx-teeth obsolete; fruit nearly orbicular. 44. Erigenia. 

 Calyx-teeth prominent; fruit oblong. 24. Musineon. 



Plants leafy-stemmed. 



Oil-tubes of the fruit none. 



Leaves biternate with broad segments. 41. AEgopodium. 

 Leaves decompound into small pinnatifid segments. 



31. Conium. 

 Oil-tubes solitary between the ribs; leaves pinnate. 



36. Cicuta. 

 Oil-tubes numerous. 



Leaves pinnately compound; segments linear. 



25. Eulophus. 



Leaves pinnate; the segments sometimes pinnatifid. 

 Tall native marsh perennials. 



Oil-tubes 1-3 in the intervals between the prominent 



ribs. 32. Stum. 



Oil-tubes numerous and close together along inner side 



of the pericarp; ribs filiform. 40. Berula. 

 Introduced plant of dry ground. 22. Pimpinella. 



Flowers yellow or purple. 

 Fruit dorsally flattened. 



Plants acaulescent; leaves finely dissected. 10. Peucedanum. 



Plants leafy-stemmed. 



Leaves pinnate; segments ovate; fruit with thin lateral wings. 7. Paslinaca. 

 Leaves pinnately compound; fruit-wings thick and corky. 9. Polytaenia. 



Fruit not flattened; ribs or some of them winged. 12. Thaspium. 



Fruit laterally flattened; leaves decompound (except in Zizia}. 



Leaf-segments oval or ovate, entire. 22. Pimpinella. 



Leaf-segments crenate, lobed or incised. 



Leaf-segments broad, crenate or dentate. 34. Zizia. 



Leaf-segments deeply incised. 



Plant native, western; ribs of the fruit filiform. 24. Musineon. 



Plant sparingly escaped from cultivation; ribs prominent. 33. Apium. 

 Leaf-segments filiform; fruit prominently ribbed. 21. Foeniculum. 



i. DAUCUS L. Sp. PL 242. 1753. 



Biennial or annual, mostly hispid-pubescent herbs, with pinnately decompound finely 

 divided leaves, and compound umbels of white or reddish flowers. Involucre of several 

 foliaceous pinnately parted bracts in our species. Involucels of numerous entire or toothed 

 bracts. Calyx-teeth obsolete. Petals obovate, the apex in flexed, those of the outer flowers 

 often dilated and 2-lobed. Stylopodium depressed or none. Umbels very concave in fruit. 

 Fruit oblong, somewhat flattened dorsally. Primary ribs 5, slender. Secondary ribs 4, 

 winged, each bearing a row of barbed prickles. Oil-tubes solitary under the secondary ribs, 

 and 2 on the commissural side of each carpel. [The ancient Greek name.] 



About 25 species, of wide geographic distribution. Besides the following, another occurs in 

 the southwestern United States. 



