92. Umbelliferae 171 



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



7. Leaves trifoUolate with ovate leaflets; involueels none 



6. Cryptotaenia 



7. Lca\es ternatcly compound, the leaflets pinnatifid, or leaves tri- 

 foliolate with narrow leaflets; involueels present. 



8. Leaves ternately compound, the leaflets never falcate 



11. Chaerophyllum 



8. Leaves with 3 principal divisions, the leaflets falcate 12. Falcaria 



6. Fruit less than twice as long as wide. 

 9. Leaves palmately or ternately divided. 



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



petals larger, 2-cleft 25. Heracleum 



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



11. Plants annual; leaves divided into filiform segments: flowers 



white; fruit ovoid, tuberculate, 1 mm long ....13. Spermolepis 

 11. Plants perennial; leaf-segments broader; fruit not tuber- 

 culate. 

 12. Central flower and fruit of the umbellet sessile; flowers 



yellow; fruit flattened laterally, the ribs filiform 



14. Zizia 



12. Central flower and fruit not sessile. 



13. Plants tall, with elongated roots; involucre absent or 

 inconspicuous. 

 14. Leaflets not entire. 



15. Flowers yellow (rarely purple) calyx-teeth 

 evident; fruit slightly flattened dorsally, the 



ribs strongly winged 20. Thaspium 



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

 16. Leaves finely divided; plants of wet 



ground 26. Conioselinum 



16. Leaves not finely divided 23. Angelica 



14. Leaflets entire; plants glaucous and glabrous 



15. Taenidia 



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

 anthers purple; petals not inflexed at the tip; in- 

 volucre present 7. Erigenia 



9. Leaves pinnately divided. 



1 7. In\olucrc present, conspicuous; flowers white. 



18. Stem mottled with purple; leaflets ovate or lanceolate, in- 

 cised or serrate; ribs of the fruit prominent; oil-tubes none 



16. Conium 



IB. Stem not purple-marked. 



19. Leaves with filiform divisions. 



20. Fruits flattened-ellipsoid, 4 mm long, the ribs filiform, 



all alike; plants perennial 10. Carum 



20. Fruits ovoid. 1-3 nun long, the ribs unlike, the lateral 



prominent, corky; annuals 17. Ptilirunium 



19. Leaflets linear to lanceolate or ovate. 



21. Leaflets regularly and sharply serrate to the base. 



22. Fruit with slender inconspicuous filiform ribs; 

 stylopodium conical; oil-tubes numerous and 

 contiguous 9. Berula 



