164 
IOWA ACADEMY OF SCIENCE 
Native to Europe, occasionally cultivated. The seeds of this plant are 
poisonous. The Euphorbia resinifera contains euphorbon C13H22O. 
173. Euphorbia cyparissias, L. Cypress Spurge. 
Frequently escaped from cultivation, especially near cemeteries. Poiosnous 
to the skin, produces a dermatitis. 
SAPINDALES. Anacardiaceae. 
174. Rhus toxicodendron, L. Poison Ivy. 
The leaves and stems are poisonous to many people. The form of derma- 
titis produced, and the seriousness of the case varies according to the sus- 
ceptibility of the individual. The plant is widely distributed in the state. 
Celastraceae. 
175. Celastrus scandens, L. Climbing Bittersweet. 
The aril is red and has a somewhat disagreeable, sweetish taste. The leaves 
are said to be poisonous to horses. Bittersweet is quite widely ditributed in 
Iowa. 
Hippocastanaceae. 
176. Aesculus hippocastanum, L. Horse-Chestnut. 
The seed of this species has long been recognized as poisonous in Europe. 
Frequently cultivated in the state, especially Southern Iowa. The glucosides 
aesculin CisHieOgl^^O, argyraescin C 27 H 42 O 12 . 
177. Aesculus glabra, Willd. Ohio Buckeye. 
Found in Southern Iowa, along river courses as far north as Fort Dodge. 
Cases of poisoning have been reported to one of us, especially where cattle 
eat the young shoots and seeds of the plant. 
Balsaminaceae. 
178. Impatiens fulva, Nutt. Spotted Touch-me-not. 
Widely distributed in the state, especially low grounds. The leaves are 
acrid. The plant is suspected of being poisonous to live stock. 
RHAMNALES. Rhamnaceae. 
179. Rhamnus cathartica, L. Buckthorn. 
Frequently cultivated. Used as a hedge plant. Chiefly in Eastern and 
Southeastern Iowa. Ripe fruit is said to be poisonous. Contains the gluco- 
sides rhamnin C 23 H 2 SO 14 , rhamnetin C 2 sHi 6 0 n and rhamno-cathartin. 
180. Rhamnus lanceolata, Pursh. Buckthorn. 
Native to southern Iowa, occurs as far north as Boone County. Has the 
same properties as the preceding species. 
V ITACEAE. 
181. Ampelopsis quinquefolia, Michx. Virginia Creeper. 
The fruit is looked upon with suspicion by some people, but there are no 
records of poisoning, so far as we know. 
MALVALES. Malvaceae. 
182. Abutilon avicennae, Gaertn. Velvet-Leaf. Indian Mallow. Butter 
Print. 
Widely naturalized in the state. The plant gives off a very disagreeable 
odor, and is suspected of being poisonous. 
