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IOWA ACADEMY OF SCIENCE 
Eastern and northeastern Iowa, seldom west of the Iowa river. Taints 
milk like the preceding. 
61. Lilium superbum, L. Turk’s-cap lily. 
According to Schaffner, this species produces dermatitis. The bulbs pro- 
duce mental exhaustion and headache. 
62. Asparagus officinalis, L. Asparagus. 
According to Dr. White, in his Dermatitis Venenata, persons who con- 
stantly work with asparagus may have the skin somewhat blistered. 
63. Convallaria majalis, L. Lily-of-th e-valley. 
All parts of this plant are very poisonous to man and domestic animals. 
Contains two glucosides, convallamarin C 46 H 44 O 24 , and convallarin C 3 4 H 31 0 n. 
64. Trillium grandifiorum, Salisb. Large flowered Trillium. 
This is used as an emetic and contains a principle which has been called 
trilline, found in a few other species of the genus. 
65. Trillium erectum. L. Erect Wake-robin. 
The root stock of this species is somewhat poisonous. 
66 . Smilax rotundifolia, L. Round-leaved Greenbrier. 
Widely distributed in the state. Dr. Schaffner reports a case of poisoning 
from eating the young leaves of these plants. The spines are injurious in a 
mechanical way; they cause inflammation and pus formation. 
IRIDACEAE. 
67. Iris versicolor, L. Large Blue-flag. 
The underground root stocks of this plant are known to be very poisonous. 
Dr. Rusby thinks there is some danger “that it might be eaten in mistake for 
Calamus, which is commonly known as Sweet-flag. If so, it would prove 
seriously if not fatally poisonous, as its well-known emetico-cathartic proper- 
ties, even when toned by drying and keeping, are powerful, and in a fresh 
state would be decidedly violent.” It contains the resinous body iridin. 
MICROSPERMEAE. 
Orchidaceae. 
68 . Cypripedium spectabile, Swz. Showy Moccasin flower. 
Produces dermatitis resembling that produced by Poison Ivy. A great 
many persons are more or less susceptible to’ this form of dermatitis. Not 
abundant in Iowa. 
69. Cypripedium pubescens, Willd. Yellow Lady-slipper. 
Poisonous like the preceding. This species is more widely distributed. 
70. Cypripedium candidum, Muhl. Small white Lady-slipper. 
Poisonous like the preceding. At one time common in marshes in the 
state, but rapidly disappearing. Less poisonous than the preceding species. 
DICOTYLEDONEAE. 
JUGLANDACEAE. 
71. Juglans nigra, L. Black Walnut. 
It is commonly believed that the bitter principle Juglandin found in the 
fruit and leaves of the black walnut are more or less poisonous, at least it 
is thought that different species may poison the soil and prevent the growth 
of other plants; this is, however, not well substantiated. Probably contains 
nucin, an acrid body, causes irritation resembling scarlatina. 
