. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 1012 Sh •;;___ _____ 1 <s&r&su Contribution from the Bureau of Animal Industry JOHN R. MOHLER, Chief. &J?*&-SU Washington, D. C. PROFESSIONAL PAPER April 17, 1922 THE DEATH CAMAS SPECIES, ZYGADENUS PANICULATUS AND Z. ELEGANS, AS POISONOUS PLANTS. By C. Dwight Marsh, Physiologist in Charge of Investigations of Stock Poisoning by Plants, and A. B. Clawson, Physiologist, Pathological Division. CONTENTS. Page. Purpose and scope of paper 1 Zygadenus paniculatus .- 2 Description and distributi
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 1012 Sh •;;___ _____ 1 <s&r&su Contribution from the Bureau of Animal Industry JOHN R. MOHLER, Chief. &J?*&-SU Washington, D. C. PROFESSIONAL PAPER April 17, 1922 THE DEATH CAMAS SPECIES, ZYGADENUS PANICULATUS AND Z. ELEGANS, AS POISONOUS PLANTS. By C. Dwight Marsh, Physiologist in Charge of Investigations of Stock Poisoning by Plants, and A. B. Clawson, Physiologist, Pathological Division. CONTENTS. Page. Purpose and scope of paper 1 Zygadenus paniculatus .- 2 Description and distribution of plant 2 Experimental feeding 3 Discussion and results 10 Symptoms 10 Duration of symptoms 12 Time required to produce symptoms ... 13 Toxic and lethal dosage 13 Zygadenus elegans 16 Description and distribution of plant 16 Experimental feeding 17 Discussion and results 20 Symptoms 20 Duration of symptoms 21 Time required to produce 21 Results of autopsy 22 Toxic and lethal dosage 22 Comparative toxicity of Z. gramineus, Z. paniculatus, and Z. elegans 24 Z. elegans not especially dangerous for sheep 25 Summary 25 PURPOSE AND SCOPE OF PAPER. In Bulletin 125, United States Department of Agriculture, page 35, the following statement was made with regard to the comparative toxicity of different species of Zygadenus:1 In the course of the experiments four species of Zygadenus were used—Z. venenosus, Z. elegans, Z. paniculatus, and Z. coloradensis—by far the greater part of the work be- ing done with Z. venenosus. The number of experiments with Z. elegans and Z. pani- culatus was very small, and the material, especially in the case of Z. paniculatus, had been shipped a long distance, so that there was some question of the water content of the plant. Apparently, however, Z. elegans and Z. paniculatus do not differ materially in toxicity from Z. venenosus. Z. coloradensis, however, produced no toxic effects whatever, with the exception of slight symptoms in one s
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