Family ASTERACE# 198 
Tribe 8. ANTHEMIDEZ. 
Rays usually present, white or pink; receptacle chaffy. 
Achenes fiattened; heads small. 1. Achillea. 
Achenes terete; heads large, 25 cm. or more broad. 2. Anthemis. 
Rays wanting or rudimentary, receptacle not chaffy. 
Heads corymbed; pappus a short crown. Tanacetum. 
Heads racemose, spicate or panicled; pappus none. 4, Artemisia. 
1. Achillea. 1013. 
1. Achillea millifolium L. Yarrow, Milfoil. 
A common weed in the eastern part of the state. Fairbury; Hat 
Creek basin; Lincoln; Nebraska City; Ponca; Red Cloud. 
2. Anthemis. 1014. 
1. Anthemis cotula L. Mayweed, Dog-fennel. 
Common in waste places in the western part of the state. Brown 
county; Lincoln; Nebraska City; St. Paul. 
4. Artemisia. 1017. 
Marginal flowers pistillate, central flowers perfect, mostly herbs. 
eel flowers sterile, not producing seeds, mostly with entire 
styles. 
Herbs, sometimes woody at the base; heads 2-4 mm. broad. 
Leaves pinnately dissected into narrow linear lobes. 
Heads 2 mm. broad, in a broad panicle. 1. A. caudata. 
Heads 4 mm. broad, in a narrow panicle. 2. A. canadensis. 
Leaves linear, mostly entire, sometimes 3-cleft or the lower 
more divided. 
Leaves glabrous. 3. A. dracunculoides. 
Leaves finely and densely pubescent. 4, A. glauca. 
_Shrubs, heads small, numerous, about 1 mm. broad. 5. A. filifolia. 
Central flowers fertile, producing seeds, their styles 2-cleft. 
Receptacle with long woolly hairs. 
Plants 2-3 dm. high, leaf segments linear-filiform, less than 1 
mm. wide. 6. A. frigida. 
Plants 6-12 dm. high, leaf segments oblong or linear-oblong, 
over 1 mm. broad. 7. A. absinthium. 
Receptacle glabrous, or slightly pubescent. 
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, the bracts ex- 
ceeded by the branches of the inflorescence. 9. A. annua. 
Heads in axillary clusters forming leafy spikes, the clus- 
ter 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 glab- 
rous above. 13. A. longifolia. 
Leaves lanceolate, shorter, 5-8 cm. long, tomentose on 
both sides. 12. A. gnaphalodes. 
Lower leaves lobed. 14. A. ludoviciana. 
