12 
Colorado Experiment Station 
Papaver species 3 
Malvastrum coccineum 2 
Verbena bracteosa 2 
Salvia lanceolata 1 
Atriplex truncata 1 
Vlentha species 4 
Leonurus cardiaca 1 
•letaria viridis 1 
:iarex species 1 
TEST No. 133. DITCH No. 1. 
Date, May 22, 1919. Duration, 1,*> min. 
Species of weed seeds, 11. 
Number of seeds, 208. 
Taraxacum officinale 158 
Chenopodium album 22 
Amaranthus blitoides 10 
Amaranthus retroflexus 7 
Polygonum aviculare 4 
Ambrosia artemisaefolia 1 
Iva xanthifolia 1 
Rumex crispus 2 
Setaria viridis 1 
Verbena bracteosa 1 
Lepidium apetalum 1 
TEST No. 136. DITCH No. 1. 
Date, May 23, 1919. Duration, 10 min. 
Species of weed seeds, 14. 
Number of seeds, 69. 
Taraxacum officinale 1 
Amaranthus blitoides 15 
Amaranthus retrofiexus 5 
Chenopodium album 13 
Iva xanthifolia 8 
Polygonum aviculare 9 
Polygonum persicaria 2 
Papaver species 5 
Polygonum convolvulus 3 
Rumex crispus 1 
Grindelia squarrosa 1 
Verbena bracteosa 3 
Setaria viridis 2 
Melilotus alba 1 
TEST No. 137. DITCH No. 1. 
Date, May 23, 1919. Duration, 1,5 min. 
Species of weed seeds, 14. 
Number of seeds, 287. 
Taraxacum officinale 174 
Chenopodium album 26 
Amaranthus blitoides 7 
Amaranthus retroflexus 39 
Iva xanthifolia 13 
Polygonum aviculare 12 
Carex species 4 
Polygonum persicaria 3 
Polygonum convolvulus 1 
Solanum rostratum 1 
Verbena bracteosa 3 
Rumex crispus 1 
Grindelia squarrosa 2 
Papaver species X 
TEST No. 140. DITCH No. 1. 
Date, May 24, 1919. Duration, 1,5 min. 
Species of weed seeds, 16. 
Number of seeds, 213. 
Taraxacum officinale 3 
Chenopodium album 58 
Amaranthus retroflexus 51 
Amaranthus blitoides 44 
Iva xanthifolia 12 
Polygonum aviculare 19 
Polygonum convolvulus 2 
Papaver species 8 
Panicularia grandis 1 
Mentha species 2 
Verbena bracteosa 5 
Teucrium occidentals 1 
Setaria, viridis 2 
Carex species 1 
Helianthus annuus 2 
Bidens frondosa . . . 1 
TEST No. 141. DITCH No. 1. 
Date, May 24, 1919. Duration, 15 min. 
Species of weed seeds, 17. 
Number of seeds, 391. 
Taraxacum officinale 245 
Amaranthus blitoides 28 
Amaranthus retroflexus 34 
Chenopodium a’ bum 38 
Polygonum aviculare 23 
Polygonum persicaria 1 
Iva xanthifolia 5 
Polygonum convolvulus 2 
Verbena bracteosa 3 
Rumex crispus 2 
Ambrosia trifida 1 
Cleome serrulata 1 
Carex species 4 
Papaver species 1 
Melilotus alba 1 
Grindelia squarrosa 1 
Mentha species 1 
TEST No. 144. DITCH No. 1. 
Date, May 24, 1919. Duration, 15 min. 
Species of weed seeds, 16. 
Number of seeds, 748. 
Taraxacum officinale 461 
Chenopodium album 64 
Amaranthus retroflexus 63 
Amaranthus blitoides 73 
Polygonum aviculare 59 
Iva xanthifolia 5 
Polygonum convolvulus 4 
Sonchus a*sper 7 
Rumex crispus 6 
Cleome serrulata 2 
Polygonum persicaria 1 
Verbena bracteosa 2 
Argemone intermedia 1 
Malvastrum coccineum 1 
Ambrosia artemisaefolia 1 
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