PLANTS OF IOWA 203 



GENTIANACE^S. GENTIAN FAMILY. 

 GENTIANA, L. 



2617. G. crinata, Froel. Fringed Gentian. 

 Common in shaded, boggy places. 



2618. G. detonsa, Rottb. Small Fringed Gentian. 

 In wet places, infrequent. 



2619. G. quinquefolia, L. Stiff Gentian. 

 Moist hillsides, common. 



2620. G. quinquefolia occidentalis, (A. Gray) A. S. H. 

 Chiefly on dry, rocky slopes. 



2621. G. puberula, Michx. Prairie Gentian. 

 In moist woods. 



2622. G. andreivii, Griseb. Closed Gentian. 

 On dry prairies. 



2623. G. flavida, A. Gray. Yellowish Gentian. 

 Not common. In deep woods. 



2624. G. rubricaulis, Schwein. Red-stemmed Gentian. 



MENYANTHACEJE. BUCKBEAN FAMILY. 



MENYANTHES, L. 



2625. M. trifoliata, L. Buckbean. 

 In wet ground, not common. 



APOCYNACE^I. DOGBANE FAMILY. 



APOCYNUM, L. 



2626. A. androscemifolium, L. Spreading Dogbane. 

 In thickets, common. 



2627. A. cannabinum, L. Indian Hemp. 



On prairies and in open places. Not rare. 



2628. A. hypericifoUum, Ait. Clasping-leaved Dogbane. 

 Not common. 



2629. A. pubescens, R. Br. Velvet Dogbane. 

 Infrequent. 



ASCLEPIADACE-ffi. MILKWEED FAMILY. 

 ASCLEPIAS, L. 



2630. A. tuberosa, L. Pleurisy-root. 



On dry prairies and ridges ; common. 



