Fig. 78.—Pokeweed (Phytolacca decandra), one-half natural size.
* Delphinium tricorne.—The dwarf larkspur, or stagger weed, of the north-eastern quarter of the United States has been especially reported from Ohio as fatal to cattle in April, when the fresh leaves appear.
* Delphinium consolida.—The seeds of the commonly introduced field larkspur are well known to be poisonous; the leaves are known in Europe to be fatal to cattle.
* Delphinium menziesii.—The purple larkspur of the north-western quarter of the United States is very common throughout Montana. In one case of poisoning reported by Dr. E. V. Wilcox, of the Montana Experiment Station, over 600 sheep were affected, 250 of which were claimed to have been killed by the weed. An experiment made by Dr. S. B. Nelson, Professor of Veterinary Sciences in the Washington State Agricultural College, shows that it is possible to feed as much as 24¾ lbs. of the fresh leaves to a sheep within a period of five days without any apparent ill effect taking place. An experiment made by Dr. Wilcox shows that the extract from less than an ounce of the dried leaves killed a yearling lamb in two hours, the dose having been given by way of the mouth.
Fig. 79.—Corn cockle (Agrostemma githago). a, Sprays showing flowers and seed capsule, one-third natural size; b, seed, natural size; b′, seed, four times natural size.
Fig. 80.—Aconite (Aconitum columbianum). a, Flowering plant; b, seed capsule—both one-third natural size.