UMBE LLIFERAE 141 



1. M. pinnatum (Walt.) B.S.P. WATER MILFOIL. Emersed leaves 

 linear, serrate : fruit 2-ridged and scabrous. Ponds at Lake City and 

 near Sibley. Common at times. June-September. 



FAMILY 92. ARALIACEAE Vent. 



Plants with usually polygamous flowers. Calyx lobes and petals five. 

 Stamens five, alternate with the petals. Ovary inferior, 1-several-celled, 

 as many styles, and one ovule in each cell. 



1. PANAX L. 



Herbs from aromatic roots. Leaves verticillate, digitately compound. 

 Flowers in a terminal umbel. Fruit a reddish berry. 



1. P. quinquefolium L. GINSENG. 1 high : leaflets five, obovate, 

 stalked, acuminate, serrate : fruit usually two-seeded. Rocky woods 

 along the Missouri bluffs from Kansas City to Atherton. Local and un- 

 common. June-July. 



FAMILY 93. UMBELLIFERAE B. Juss. 



Herbs with usually compound leaves and umbellate flowers. Calyx 

 teeth five or obsolete. Petals and stamens five each, inserted on the disk 

 crowning the summit of the inferior 2-celled, 2-ovuled ovary. Styles 

 two. Fruit consisting of two carpels, each marked with five main and 

 often with four additional ribs, often with oil tubes between the ribs, or 

 the ribs winged. 



Leaves linear, spiny. 6. ERYNGIUM. 



Leaves digitately 3-7-foliolate ; fruit bristly. 7. SANICULA. 



Leaves 3-foliolate ; fruit smooth. 16. BERING A. 

 Leaves pinnately compound or decompound. 

 Flowers yellow. 



Plants acaulescent. 4. LOMATIUM. 



Plants caulescent 

 Plants caulescent 

 Plants caulescent 



leaflets capillary. 8. FOENICULUM. 



leaflets ovate, not toothed. 9. TAENIDIA. 

 leaflets not capillary, toothed. 



Fruit strongly flattened. 



Fruit with filiform ribs. 2. PASTINACA. 



Lateral ribs of fruit corky-thickened. 3. POLYTAENIA. 

 Fruit not strongly flattened. 



All the fruits pedicelled. 5. THASPIUM. 



Central fruit of each umbellet sessile. 14. ZIZIA. 

 Flowers white. 



Leaf divisions capillary. 



Fruit tuberculate. ' 10. APIASTRUM. 



Fruit not tuberculate. 17. PTILIMNIUM. 



Leaf divisions not capillary. 



Fruit covered with barbed prickles. 1. DAUCUS. 



Fruit not covered with barbed prickles. 

 Fruit linear to linear-oblong. 



Fruit glabrous. 11. CHAEROPHYLLUM. 



Fruit appressed-bristly. 12. WASHINGTONIA. 



Fruit ovoid, oval or oblong. 

 Stem-leaves simply pinnate. 13. SIUM. 



Stem-leaves decompound. 15. CICUTA. 



