476 " CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Stylopodium wanting; 

 calyx teeth minute 

 or obsolete; dorsal 



ribsfiliform 19. Cogswellia (p. 484). 



Stylopodium present; 

 calyx teeth evi- 

 dent; dorsal ribs 



sharp or winged. . .25. Cynomarathrum (p. 485). 

 Plants caulescent, branching. 

 Flowers white; dorsal 



ribs prominent 13. Angelica (p. 481). 



Flowers yellow; dorsal 



ribsfiliform 23. Pastinaca (p. 485). 



Oil tubes more than one in the inter- 

 vals between the ribs. (See 

 also Aulospermum.) 

 Plants caulescent, branching. 



Leaves ternately or pinnately 



compound 13. Angelica (p. 481). 



Leaves several times com- 

 pound 12. Conioselinum (p. 480). 



Plants acaulescent or nearly so. 

 Lateral wings of the fruit 



thin 19. Cogswellia (p. 484). 



Lateral wings of the fruit 

 thickened. 

 Dorsal ribs very promi- 

 nent or slightly 



• winged 17. Pseudocymopterus (p. 482). 



Dorsal ribs filiform 16. Cymopterus (p. 482). 



Fruit not strongly flattened dorsally, 

 usually more or less laterally corn- 



Oil tubes more than one in the inter- 

 vals between the ribs. 

 Stylopodium conical. 



Fruit spherical, with globose 

 carpels and very slen- 

 der inconspicuous ribs. 9. Berula (p. 479). 

 Fruit ovoid or oblong, with 



prominent equal ribs. .10. Ligusticum (p. 480). 

 Stylopodium flat or wanting. 



Seed face sulcate or concave. .15. Aulospermum (p. 481). 

 Seed face plane or but slight- 

 ly concave. 

 Leaves pinnate, with 

 short crowded seg- 

 ments; flowers pur- 

 plish 14. Phellopterus (p. 481). 



Leaves ternate-pinnate, 

 with distant seg- 

 ments; flowers yel- 

 low 26. Pteryxia (p. 485). 



