98 THE AMERICAN MIDLAND NATURALIST. 
Helianthus scaberrimus El. ROUGH SUNFLOWER. 
Prairie and roadsides. Common. July 30. . 
Helianthus maximilianit Schrad. *NARROW-LEAVED SUNFLOWER. 
Fields and roadsides. Common. July 30 (29). 
Helianthus tuberosus \. JERUSALUM ARTICHOKE. 
Low fields and roadsides; especially near the woods. Common. 
Aug. 20 (18). The records of H. giganteus and grosse-serratus 
are considered as errors, the specimens being maxzmuiliant. 
Bidens cernua \,. BUR MARIGOLD. 
Riverbank or other low places. Occasional. Aug. 20. . 
Bidens comosa (A. Gray) Wiegand. 
Riverbank, low fields ete. Common. Aug. 20. I prefer to call 
our form B. acuta (Wiegand) Britton. 
Bidens frondosa \. - BEGGARTICKS. 
Riverbank. Common. Aug. 20. 
Bidens vulgata Greene. *LARGE BEGGARTICKS. 
Riverbank and. fields (not especially in low places). Common. 
vb aie a 
Galinsoga parviflora Cav. 
C. H. Waldron in 1911 near Oak Grove. 
Gaillardia aristata Pursh. GAILLARDIA. 
Lee in 1891. Unknown to me in immediate vicinity. I have 
seen it on a knoll near the Sheyenne River at Christine, June 20 
(a7). 
Achillea lanulosa Nutt. MILFOIL. YARROW. 
Prairie. Common. June 15 (14). 
Anthemis cotula \. DOG FENNEL. 
Along railroad and streets. Frequently introduced but little 
persisting. June 20. 
Chrysanthemum leucanthemum L,. OX-EYE DAISY. 
C. H. Waldron in 1910. 
Artemisia caudata. Michx. PRAIRIE WORMWOOD. 
Along railroad, introduced in gravel. Aug. 10. 
Artemisia frigida Willd. LITTLE SAGE. 
Bergman in 1g1o. 
Artemisia absinthium:\,. ABSINTH. 
Along railroad and streets. Occasional. Aug. ro. 
Artemisia biennis Willd. WORMWOOD. 
Riverbank, sloughs and low fields. Common. Aug. 30. 
