50 
IOWA ACADEMY OF SCIENCES 
OLEACEAE. 
Fbaxinus. 
594. F. 
595. F. 
596. F. 
Gentiana. 
597. G. 
598. G. 
599. G. 
600. G. 
americana L. Plenty in woods. 
lanceolata Borck. Common in deep woods. 
nigra Marsh. Plenty in moist woods. 
GENTIANACEAE. 
puberula Michx. Plenty on prairie hillsides. 
andreicsii Griseb. Abundant in swamps and marshes. 
flavida A. Gray. Plenty in moist thickets. 
ruhricaulis Schwein. Scarce in moist soil. 
MENYANTHACEAE. 
Menyanthes. 
601. M. trifoliata L. Scarce in swamps. 
apocynaceae. 
Apocynum. 
602. A. an dr osaemi folium L. Abundant in fields and woods. 
603. A. cannaMnum L. Very abundant in fields and waste places. 
604. ' A. hyper id folium Ait. Rather scarce in dry soil. 
asclepiadaceae. 
Ascleptas. 
605. A. tuherosa L. Common on prairies. “Pleurisy-root”. 
606. A. purpurascens L. Scarce in woods.; 
607. A. incarnata L. Common in svv'amps. 
608. A. suUivantii Engelm. Rare in open fields. 
609. A. syriaca L. Common in fields and waste places. (A. cornuti 
Dec.) 
610. A. ovalifolia Dec. Scarce in dry soil. 
611. A. vertidllata L. Common on prairies and in waste places. 
Acerates. 
612. A. viridiflora (Ra.f.) ' Eaton. Common on dry prairies. 
613. A. lanuginosa (Nutt.) Dec. Scarce on dry prairies. 
convolvulaceae. 
Ipomoea. 
614. I. purpurea (D).Rcth. Plenty; escaped from gardens. 
Convolvulus. 
615. C. sepium L. Abundant in fields and along streams. 
616. 0. arvensis L. Scarce in dry fields. 
cuscutaceae. 
CUSCUTA. 
617. C. arvensis Bej^rich. On Solidago serotina. Rare. 
618. G. polygonorum Engelm. Plenty on Polygonaceae. 
619. C. paradoxa Raf. Common on Compositae. Distinguished from 
our other species by the thick flower clusters. (0. glomer- 
ata Ghoisy. G. aphylla Raf.) 
