626 MINNESOTA BOTANICAL STUDIES. 
8. Horseweed (Lefizlon canadense). On the higher ridges, 
where common rush grew in ’98. 
II. Aquatics, marsh plants and cryptogams which were still 
struggling along in a few spots. July of this year, the most im- 
portant month of growth for annual and perennial herbs in this 
region was unusually dry, showing a monthly deficiency in 
precipitation of 1.75 inches.* This condition was unfavorable 
for aquatics and marsh plants, but favorable for such plants as 
horseweeds and common ragweeds. 
1. Wild rice (Zizanza aquatica). 
Water plantain (Alisma plantago-aquatica). 
Common rush (Juncus effusus). 
Broad-leaved cattail (Zypha latifolia). 
. Tuberous white water lily (Castalia tuberosa). Identi- 
fied fre leaves only. 
6. Large yellow pondlily (Wymphea advena). Leaves 
only, a flower bud found an inch deep in wet soil. 
7. Horsetails ; mosses, amongst them Funarza hygrometrica ; 
liverworts, with Marchantia polymorpha fairly common. 
III. Plants of which only a few scattered specimens were 
found. 
as eS i) 
i 
. 
Slender nettle (Urtica gracilis). 
Swamp milkweed (Asclepias ‘ncarnata). 
Smooth bur-marigold (Bzdens levis). 
Marsh skullcap (Scutellaria galericulata). 
Blue vervain ( Verbena hastata). 
White vervain ( Verbena urticifolia). 
Beggarticks (Bzdens frondosa). 
Aster-like boltonia (Boltonza asterotdes). 
g. Rough cinquefoil (Potentilla monspeliensis). 
10. Great ragweed (Ambrosia trifida). 
11. American cocklebur (XNanthrum canadense). 
12. Prickly lettuce (Lactuca scariola). 
13. Lactuca sp. 
14. Heart-leaved willow (Sax cordata). 
15. Salix sp. 
16. Cottonwood (Populus deltoides). 
17. American aspen (Populus tremulordes). 
18. Sullivant’s milkweed (Asclepias sullivantii). Identified 
from leaves only. 
On ame WwW bv 
* The rainfall data of this paper are taken from the Monthly Meteorological 
Summary of the United States Weather Bureau for St. Paul, Minn. 
