Upham.] 
162 
[May 21, 
Arctium Lappa, L. ( Common Burdock ), frequent or common on 
vacant lots in towns, along roadsides, etc., especially southward. 
Cnicus lanceolatus , Hoffm. ( Common Thistle ), frequent, but not 
yet generally plentiful or troublesome. 
Cnicus arvensis, Hoffm. (“ Canada Thistle”), too common about 
Winnipeg and along the Red river in Manitoba, but infrequent in 
other parts of the basin. Prof. W. J. Beal, as quoted by L. H. 
Pammel in his list of the “ Weeds of southwestern Wisconsin and 
southeastern Minnesota,” says of this species : — “Its course west- 
ward is likely to be checked by the fact that it has usually failed 
to produce seeds on the prairies.” 
Lygodesmia juncea, Don., observed as a weed in cultivated fields 
on the “First Pembina Mountain,” near Walhalla, North Dakota. 
Taraxacum officinale, Weber ( Common Dandelion ), frequent 
along roadsides, in pastures, etc., about Winnipeg, and plentiful 
at the w'est end of the main street in Saint Vincent; generally rare 
or absent throughout the Red river valley and westward, but it may 
be expected to become abundant. 
Sonclius oleraceus, L. ( Common Sow-Thistle ), occasional in 
waste places around dwellings. 
Sonclius asper, Vili. ( Spiny Sow-Thistle) , more frequent, and 
occurring in cultivated fields. 
Apocynum androssemifolium, L. (Spreading Dogbane) , frequent 
along fences and on fallow land. 
Asclepias speciosa, Torr., and A. Cornuti, Decaisne (Milkweed, 
Silkweed), are occasionally troublesome in grain-fields. 
Cynoglossum officinale, L. ( Common Hound's- Tongue, Sheep 
Bur) , becoming a frequent weed of pastures, roadsides, and waste 
places. 
Echinospennum Virginicum, Lehm. (Beggar’s Lice), frequent on 
borders of fields adjoining woodlands and thickets. 
Ecliinospermum Lappula , Lehm. (Stick seed, Small Sheep Bur), 
frequent, occasionally abundant, by roadsides, in pastures, and es- 
pecially in the vicinity of towns. 
Echinospennum Redowskii, Lehm., var. occidentale, Watson, in 
habit and frequency nearly like the last. 
Convolvulus sepium, L. (Hedge Bindweed, Bracted Bindweed), 
sometimes troublesome in grain-fields, in the same way as Polygo- 
num Convolvulus, which is more abundant in cultivated ground. 
Solanum triflorum, Nutt. (Three-flowered Nightshade), a fre- 
