IOWA ACADEMY OF SCIENCE 
69 
GERANIACEAE. 
GERANIUM (Tourn) L. 
570. Geranium maculatum L. Wild Geranium. Common in woodlands, 
and as a weed in open places. 
571. Geranium carolinianum L. Carolina Cranesbill. Much less com- 
mon; occurs in sandy soils. 
RUTACEAE. 
ZANTHOXYLUM L. 
572. Zanthoxylum americanum Mill. Prickly Ash. Common in woods 
and thickets. 
POLYGALACEAE. 
POLYGALA (Tourn) L. 
573. Polygala verticillata L. Whorled Milkwort. Not uncommon in 
dry soils in open places. 
574. Poly gala senega L. Seneca Snakeroot. Common in woods and 
thickets. 
575. Polygala sanguinea L. Field or Purple Milkwort. Common in 
moist meadows. 
EUPHORBIACEAE. 
CROTON L. 
576. Croton glandulosus L. Yar. septentrionalis Muell, Arg. Glandu- 
lar Croton. Locally abundant in sandy places. 
ACALYPHA L. 
577. Acalypha virginica L. Three Seeded Mercury. Common in fields 
and wooded places. 
EUPHORBIA L. 
578. Euphorbia polygonifolia L.. Seaside Spurge. Not rare in sandy 
places, 
579. Euphorbia gey eri Engelm. Geyer’s Spurge. Common everywhere. 
580. Euphorbia serpens H. B. K. Round-leaved Spreading Spurge. 
Scarce on moist banks. 
