IOWA ACADEMY OF SCIENCES. 
227 
GENTIANACE^. 
Gentiana. 
484. G. quinqiiefolia occidentalis (Gray) Hitch. {G. 
quinqueflora occidentalis Gray.) Borders of 
woods and thickets, mostly on dry ground; 
common. 
485. G, jqwherulaMichx. Prairie; frequent. 
486. G, andrewsii Griseb. Wet meadows and along 
streams; infrequent. 
487. G. Jiavida Gxduj. (G, alba Muhl.) Thickets and 
roadsides in moist ground; infrequent. 
APOCYNACE^. 
Apooynum. 
488. A. androsmmifolktm L. Dry thickets and road- 
sides, especially sandy ground; common. 
489. A.cannabimtmh. Moist fields and along streams; 
common. 
ASCLEPIADACE^. 
Asclepias. 
490. A. twberosa L. Dry, open ground; common. 
491. A. pwrpwrascens h. Thickets; scarce. 
492. A. incarnata L. Swampy ground; common. 
493. A. sidlivaniii Eng. Dry, sandy, open ground; 
scarce. 
494. A. syriaca L. {A. cornuti Dec.) Fields and 
meadows; abundant. 
495. A. ovalifolia Dec. Dry, stony or sandy ground; • 
scarce. 
496. A. verticillata L. Sandy, open ground; frequent. 
Acerates. 
497. A. viridiflora (Raf.) Eat. Dry, open ground; fre- 
quent. 
498. A, lanuginosa (Nutt.) Dec. Dry, sterile ground: 
rare. 
