14 
Colorado Experiment Station 
Species — 
llelianthus petiolaris — Sunflower 
Iva ciliata — Rous:h marsh elder . 
Iva xanthifolia — Marsh elder 
Kochia scoparia — Fireweed or burning- bush 
Eactuca scariola — Wild lettuce 
Lappula occidentale — Beggar’s lice 
Leonurus cardiaca — Motherwort 
Lepidium apetalum — Peppergrass 
Lupinus species — Lupine 
Lycopus americanus — Water horehound 
Malvastrum coccineum — False mallow 
Medicago lupulina — Black medick 
Melilotus alba — White sweet clover 
Mentha species — Mint 
Nepeta cataria — Catnip 
Opuntia polycantha — Prickly pear 
Oxalis stricta — Wood sorrel 
Papaver species — Poppy 
Panicum capillare — Witchgrass 
Panicularia grandis — Manna grass 
Polygonum aviculare — Knot-v\'eed 
Polygonum convolvulus— Wild buckwheat 
Polygonum dumetorum — Smartweed 
Polygonum engelmanii — Smartweed 
Polygonum pennsylvanicum — Pennsylvania smartweed 
Polygonum persicaria — Lady’s thumb 
Portulaca oleracea — Purslane 
Potentilla monspeliensis — Cinquefoil 
Ranunculus species — Buttercup 
Rosa species — Wild rose 
Rumex acetosella — Sheep sorrel 
Rumex crispus — Curled dock 
Salsola tragus — Russian thistle 
Salvia species — Sage 
Salvia lanceolata — Sage 
Setaria glauca — Yellow foxtail 
Setaria viridis — Green foxtail 
Solanum rostratum — Buffalo bur 
Solanum species — Wild potato 
Sonchus asper — Rough sow thistle 
Stellaria media — Chickweed 
Syntherisma humifusum — Small crabgrass 
Taraxacum officinale — Dandelion 
Teucrium occidentale — Wood sage 
Thalictrum species — Meadow-rue 
Tragopogon sp. — Oyster plant 
Urtica gracilis — Slender nettle 
Verbena hastata — Blue vervain 
No. of samples in 
which occurred 
16 
2 
106 
1 
1 
6 
16 
2 
2 
1 
5 
1 
2 
17 
8 
1 
3 
32 
3 
3 
133 
88 
1 
12 
1 
70 
14 
2 
23 
1 
. . .122 
.. . X 
. . . 4 
. . . 1 
. . . 2 
. . . 20 
. . . 28 
. . . 2 
. . . 3 
3 
104 
12 
1 
1 
11 
25 
