60 IOWA ACADEMY OF SCIENCE 
ASCLEPIDACEAE. * 
ASCLEPIAS (Tourn) L. 
701. Asclepias tuberosa L. Butterfly Weed. Common on prairies. 
702. Asclepias purpurasecns L. Purple Milkweed. Rather scarce in 
dry places. 
703. Asclepias incarnata L. Swamp Milkweed. Common in swamps 
and marshes. 
704. Asclepias syriaca L. Common Milkweed. Common everywhere in 
open places. 
705. Asclepias sullivantii Engelm. Sullivant’s Milkweed. Much less 
common but not rare. 
706. Asclepias amplexicaulis Sm. Blunt-leaved Milkweed. Locally 
abundant in sandy soils'. 
707. Asclepias pJiytolaccoides Pursh. Poke Milkweed. Rare in thick- 
ets; Turkey Creek. 
708. Asclepias ovalifolia Dene. Oval-leaved Milkweed. Not rare in 
woods and thickets. 
709. Asclepias verticillat a L. Whorled Milkweed. Rather scarce in 
dry soils. 
710. Asclepias stenopkylla Gray. Narrow-leaved ' Milkweed. Rather 
scarce in dry open places. 
ACERATES Ell. 
711. Acerates viridiflora Ell. Green Milkweed. Common in dry 
meadows. 
712. Acerates lanuginosa (Nutt.) Dene. Woolly Milkweed. Scarce in 
sandy fields. 
CONVOLYULACEAE. 
IPOMOEA L. 
713. Ipomoea coccinea L. Small Red Morning Glory. Sparingly in- 
troduced in waste places. 
714. Ipomoea hederacea Jacq. Ivy-leaved Morning Glory. Not un- 
common in waste places. 
715. Ipomoea purpurea (L.) Roth. Morning Glory. Common along 
streams and in waste places. 
