1890. ] 
161 
[UphaiH. 
Ambrosia artemisisefolia, L. (Roman Wormwood, Bitterweed), 
common along railways, and in fields and towns. 
Ambrosia psilostachya, DC., similar with the preceding in habit, 
but less plentiful. 
Xanthium Canadense, Mill. (Cocklebur), frequent in waste 
places, and especially on alluvial soil of rivers. 
Rudbeckia hirta, L., frequent in fallow fields and along rail- 
ways ; also frequent, occasionally abundant, on the general prairie. 
Helianthus annuus, L. (Common Sunflower, indigenous), fre- 
quent, sometimes persisting as a rank weed, on alluvial bottom- 
lands. 
Helianthus rigidus, Desf., very common on the natural prairie, 
one to three feet high ; continuing as a bad weed in wheat-fields 
during the first two or three years of cultivation, there growing 
from three to five feet in height. 
Helianthus Maximilian!, Schrader, the most noteworthy species 
of sunflower in the Red river basin, more plentiful than the last, 
preferring somewhat moister land ; usually from nine to eighteen 
inches high, or sometimes three to five feet, on the prairie, but 
persisting as the most troublesome weed in wheat-fields, where it 
commonly grows four to six feet in height and sometimes eight feet 
or more. 
Bidens frondosa, L. (Common Beggar-ticks), frequent on road- 
sides and in waste places, on rich, moist soil. 
Anthemis Gotula , DC. ( May-weed , Dog Fennel ), common, often 
abundant, in door-yards, on roadsides, etc., preferring rather hard, 
clayey soil, through the southern two-thirds of Minnesota ; scarce 
or absent from Ada northward in the Red river valley, but likely 
to spread over this entire basin. 
Achillea Millefolium, L. (Yarrow, Milfoil), frequent in fields 
and along roadsides ; indigenous and common throughout the dis- 
trict. 
Chrysanthemum Leucanthemum , L. (Ox-eye Daisy, White-weed ), 
rare and local in Minnesota and Manitoba ; not observed by me in 
the Red river basin. 
Tanacetum vulgar e, L. (Common Tansy), frequent along roads 
and fences, near dwellings. 
Artemisia Canadensis, Michx., A. dracunculoides, Pursh, A. 
Ludoviciana, Nutt., and A. biennis, Willd. (Wormwood species), 
are common in fallow fields, on roadsides, and along railways. 
11 FEBRUARY, 1891. 
PROCEEDINGS B. S. N. H. 
VOL. XXV 
