Jones: Flora of Illinois, 119. Umbelliferae 195 



3. Ovary and fruit with hooked or barbed bristles. 



4. Plants glabrous; leaves palmately 3-7-foliolate ; ovary and fruit with hooked 



bristles 4. Sanicula 



4. Plants pubescent; leaves pinnately decompound. 



5. Ovary and fruit with hooked bristles; rays of the umbel short 3. Torilis 



5. Ovary and fruit with barbed bristles; rays long 2. Daiicus 



2. Ovary and fruit not at all bristly or prickly (rarely tuberculate) . 

 6. Fruit 2-4 times longer than wide; flowers white. 



7. Leaves trifoliolate with ovate leaflets; mvolucels none 6. Cr^piolaenia 



7. Leaves ternately compound, the leaflets pinnatifid; involucels present 



10. Chaerophyllum 



6. Fruit less than twice as long as wide. 



8. Leaves palmately or ternately divided. 



9. Leaves copiously soft-pubescent; umbels 15-30 cm. broad; outer petals 



larger, 2-cleft 23. Heracleum 



9. Leaves usually glabrous; none of the petals enlarged. 



10. Plants annual; leaves divided into filiform segments; flowers white; fruit 



ovoid, tuberculate, 1 mm. long II. Spermolepis 



10. Plants perennial; leaf -segments broader; fruit not tuberculate. 



II. Central flower and fruit of the umbellet sessile; flowers yellow; fruit 



flattened laterally, the ribs filiform 12. Zizia 



I I. Central flower and fruit not sessile. 



12. Plants tall, with elongated roots; involucre absent or inconspicuous. 

 13. Leaflets not entire. 



14. Flowers yellow; calyx-teeth prominent; fruit slightly 

 flattened dorsally, the ribs strongly winged.... 18. Thaspiitm 

 14. Flowers white; calyx-teeth small or obsolete. 



15. Leaves finely divided; plants of wet ground 



24. Conioselinum 



15. Leaves not finely divided 21. Angelica 



13. Leaflets entire; plants glaucous and glabrous 13. Taenidia 



12. Plants small, with a tuber, flowering early in spring; anthers 



purple; petals not mflexed at the tip; involucre present 



7. Erigenia 



8. Leaves pinnately divided. 



16. Involucre present, conspicuous; flowers white. 



17. Stem mottled with purple; leaflets ovate or lanceolate, incised or ser- 

 rate; ribs of the fruit prominent; oil-tubes none 14. Conium 



17. Stem net purple-marked. 



18. Leaflets filiform 15. Plilimnium 



18. Leaflets linear to lanceolate or ovate. 



19. Leaflets regularly and sharply serrate to the base. 



20. Fruit with slender inconspicuous filiform ribs; stylopodium 



conical; oil-tubes numerous and contiguous 9. Deriila 



20. Fruit with equal, prominent corky ribs; stylopodium 



depressed; oil-tubes 1-3 in each interval 16. Sium 



19. Leaflets remotely and irregularly dentate usually only above the 

 the mi(Sdle, or entire 25. Oxvpolis 



16. Involucral bracts none, or few and soon deciduous. 

 21. Flowers white; fruit scmev.hat flattened laterally. 



22. Leaflets serrate 17. Cicula 



22. Leaflets not serrate 8. Eulophus 



21. Flowers yellow; fruit flattened dorsally. 



23. Leaf-segments filiform; slender annuals 19. Aneihum 



23. Leaf-segments broader. 



24. Stem terete; fruit with thick corky margin, obscure ribs, and 

 numerous oil-tubes; plants perennial 20. Polylaenia 



24. Stem grooved; fruit with filiform dorsal ribs, thin wings, and 

 solitary oil-tubes; stout biennial 22. Pastinaca 



