COCKLEBURS AS POISONOUS PLANTS 
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Salina, Utah, June 20, 1921. 
Salina, Utah, June 24, 1921. 
do 
Salina, Utah, July 1, 1921. 
do 
do 
Grown at station... 
do 
do 
do 
Salina, Utah, June 16, 1921. 
Grown at station 
Salina, Utah, June 16, 1921. 
Grown at station 
Salina, Utah, June 20, 1921. 
Salina, Utah, early in 
summer. 
Salina, Utah 
Grown at station 
Salina, Utah, June 28 
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Salina, Utah, July 10 
do 
Salina, Utah, July 20 
Salina, Utah, July 21 
Salina, Utah 
Sterling, Utah, Aug. 29. _. 
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Stems and roots, young cot- 
yledon stage. 
Whole plant, young cotyle- 
don stage. 
Cotyledons, young cotyle- 
don stage. 
Whole plant, young cotyle- 
don stage. 
do 
do 
Cotyledons, young cotyle- 
don stage. 
Whole plant, young cotyle- 
don stage. 
do 
Cotyledons, young cotyle- 
don stage. 
Whole plant, young cotyle- 
don stage. 
Cotyledons, medium coty- 
ledon stage. 
Cotyledons, young cotyle- 
don stage. 
Whole plant, young cotyle- 
don stage. 
Seeds from green burs 
Cotyledons, young cotyle- 
don stage. 
do 
do 
Stems and roots, young co- 
tyledon stage. 
Cotyledons 
do .- 
do 
Whole plant except cotyle- 
dons. 
Cotyledons 
Whole plant, young cotyle- 
don stage. 
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June 21, 1921 
June 27, 1921 
do 
July 5, 1921 
July 9, 1921 
July 11, 1921 
Aug. 18, 1921 
Aug. 24, 1921 
Aug. 29, 1921 
do.. 
Sept. 5, 1921 
Sept. 9, 1921 
do 
Sept. 11, 1921 
Sept. 14, 1921 
do 
Sept. 22, 1921 
do 
June 29, 1922 
July 5, 1922 
do 
July 10, 1922 
July 14, 1922 
do 
Aug. 3, 1922 
Aug. 9, 1922 
Sept. 12, 1922 
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