ASTERACEAE: AXTHEMIDEAE 189 



Leaves green, glabrous or pubescent, dissected. 



Heads 4 mm. broad, perennials. 8. A. abrotanum. 



Heads 2 mm, broad, annuals or biennials. 



Heads in a loose panicle, if leafy bracted tbe bracts ex- 

 ceeded by the branches of the inflorescence. 



9. A. annua. 



Heads in axillary clusters forming leafy spikes, the cluster 



much exceeded by the leaves. 10. A. biennis. 



Leaves densely white canescent or tomentose at least beneath. 



Leaves deeply pinnatifid, the segments incised. 



11. A. vulgaris. 

 Leaves not pinnatifid, lanceolate or linear, rarely 3-5 parted. 

 Leaves all entire. 



Leaves linear, elongated, 5-12 cm. long, at length glabrous 



above. A. longifolia. 



Leaves lanceolate, shorter, 5-8 cm. long, tomentose on 



both sides. 12. A. gnaphaloides. 



Lower leaves lobed. 14. A. ludoviciana. 



Flowers all perfect; all producing seeds; shrubs. 



Leaves cuneate, 3-toothed or 3-lobed. 15. A.tridentata. 



Leaves linear, entire. 16. A. cana. 



1. Artemisia caudata Michx. Wild Wormwood. 

 In dry soil in the western part of the state. Grand Island; Long Pine; 

 Riverton. 



2. Artemisia canadensis Michx. Canada Wormwood. 

 Common in dry soil in the western part of the state. Banner County; 

 Deuel County; Hat Creek Basin; Long Pine; Minden; Thedford. 



3. Artemisia dracunculoides Pursh. 



In dry prairies throughout the state. Deuel County; Chadron; Lin- 

 coln; Nebraska City; Scribner; Walton. 



4. Artemisia glauca Pall. 

 Ft. Robinson. 



5. Artemisia filifolia Torr. 



On dry prairies in the western part of the state. Antelope County; 

 Box Butte County; Callaway; Crawford. 



6. Artemisia frigida Willd. 



Common in dry soil in the western part of the state. Banner County; 

 Belmont; Box Butte County; Hat Creek Basin; Thedford; Long Pine. 



7. Artemisia absinthium L. Common Wormwood. 

 Sometimes escapes from gardens. Nebraska City. 



8. Artemisia abrotanum L. 



Nebraska according to Britton's Manual. 

 ^. Artemisia annua L. 

 In woods. Riverton. 



10. Artemisia biennis Willd. 



A common weed in the eastern part of the state. Kennedy; Lin- 

 coln; Nebraska City; Wahoo; Whitman; Red Cloud; Valentine. 



11. Artemisia vulgaris L. Common Mugwort. 

 Grand Island. 



12. Artemisia gnaphaloides Nutt. 



Common on dry prairies all over the state. Brown County; Cherry 

 County; Kearney; Kimball; Lincoln; Nebraska City; Thedford. 



