52 
IOWA ACADEMY OP SCIENCE 
Bohioiia Pseudacacia L. Black Locust. Sioux City 16 (HBC)^ 
19 (EST), Missouri Valley 71 (HBC). 
Wisteria fratescens (L.) Poir. ’Wisteria. This handsome 
woody climber is frequently cultivated. 
Caragana arhorescens Lam. Siberian Pea Tree. Occasionally 
cultivated. 
RUTACE^ Rue Family. 
Zanthoxylum americanurn Mill. Prickly Ash. Oto 34 (HBC)^ 
Sioux City 23 (HBC), Payne (HBC & LHP), Missouri Valley 
79 (HBC), Council Bluffs 57 (LHP & HBC), Hamburg 30 
(LHP & HBC), Sioux City. Thickets in ravines. Common. 
SIMARUBACEiE Quassia Family, 
Ailantkus glandulosa Desf. Tree of Heaven. Occasionally 
cultivated but an undesirable tree. Council Bluffs. 
ANACARDIACE^ Sumach Family. 
Rhus glahra L. Smooth Sumach. Sioux City 5, 13 (HBC), 
Oto 41 (HBC), Missouri Valley (HBC), Council Bluffs 54 
(LHP & HBC). Abundant in loess bluffs. 
Rhus Toxicodendron L. Poison Ivy. Poison Oak. Common 
everywhere in thickets from Lyon to Fremont counties. 
CELASTRACE^ Staff Tree Family. 
Evonymus atropurpureus Jacq. Wahoo. Burning Bush. Sioux 
City (LHP) (HBC), Plymouth county, Payne (LHP & HBC), 
Missouri Valley (HBC) (Olive F. Brown), Common in ra- 
vines. 
Celastrus scandens L. Climbing Bitter-sweet. Sioux City 
(LHP), Hamburg 15 (LHP & HBC). Common in thickets. 
STAPHYLEACE^ Bladder Nut Family. 
Staphylea trifolia L. American Bladder Nut. Sioux City 
(Bandusia Wakefield). Not common. In ravines. 
ACERACE^ Maple Family. 
Acer nigrum Michx. Black Hard Maple. Cultivated in Sioux 
City, Whiting, Missouri Valley, Hamburg, and other places in 
western Iowa. The species is native about Sioux Eapids and 
Lake Okoboji (LHP). 
Acer platanoides L. Norway Maple. Frequently cultivated. 
Acer saccharinum L. Soft Maple. Sioux City 5, 8 (HBC), 
6 (RST), Oto 27 (HBC), Hamburg 13, 35 (LHP & HBC), 
