228 
IOWA ACADEMY OF SCIENCES. 
CONVOLVULACE^. 
Ipomcea. 
499. I. purpurea (L.) Roth. Sparingly escaped along 
roads. 
Convolvulus. 
500. C. sepiam L. A^bundant in fields and meadows. 
CUSCUTACE^. 
CuSCUTA. 
501. C. orvensis Bryrich. On species of Leguminosce ; 
infrequent. 
502. C. polygonorum Eng. (C. chlo7^ocarpa Eng.) Fre- 
quent on Polygonum and other weeds in low 
ground. 
503. C. cephalanthiEng. {C. temii flora ^ng.) Common 
on various coarse weeds. 
504. C. paradoxa Raf. (C. glomerata Choisy). Fre- 
quent on various coarse weeds and shrubs. 
POLEMONIACE.®. 
Phlox. 
505. P. paniciilata h. Rarely escaped. 
506. P. maculata L. Frequent in swampy meadows. 
507. P. pilosa L. Abundant in meadows. 
508. P. divaricata L. Abundant in damp woods. 
POLEMONIUM. 
509. P. reptans L. Abundant in woods. 
HYDROPHYLLACE^. 
Hydrophyllum. 
510. H. virginicum h. Woods; ab.undant. 
511. H. appendicu latum Michx. Woods; rare. 
Macrooalyx. 
512. M. nyctelea (L.) Kuntze. (Ellisia nyctelea L.) 
Moist, shady places; abundant. 
