IOWA ACADEMY OF SCIENCES. 
239 
432. A. verticillata L. Open woods and prairies; fre- 
quent. 
Acerates Ell. 
433. A. lanuginosa (Nutt.) Decaisne. Frequent on high 
prairies. 
CONVOLVULACE^;. 
Convolvulus L. 
434. C. sepiarn L. ( Calystegia sepium R. Br.) Wild 
Morning-Glory* Woods and prairies; very com- 
mon and troublesome in cultivated fields. 
, ' , ■ > « 
CUSCUTACE,®. 
Cuscuta L. Dodder. 
435. C. arvensis Beyr. Parasitic on Artemisia on a dry 
knoll east of Armstrong. 
436. C. polygonorum Engelm. (C. chlorocarpa Engelm.) 
Iowa Lake; common on various tall herbs. 
437. C. cephalanthi Engelm. ( C . tenuiflora Engelm.) 
South of Iowa Lake; the last three species de- 
termined by Prof. B. Shimek. 
438. C. paradoxa Raf. (C. glomerata Choisy.) Our 
commonest species, looking like rope wound 
round tall herbs. 
POLEMONIACEJE. 
Phlox L. Phlox; Wild Sweet William. 
439. P. pilosa L. Very common; woods and prairies. 
The flowers occasionally pure white, 
440. P. divaricata L. Very common in woods. 
HYDROPHYLLACE^E . 
Hydrophyllum L. 
441. H. virginicum L. Water-leaf. Common in low 
woods. 
Macrocalyx Trew. 
442. M. nyctelea (L) Ivuntze. ( Ellisia nydelea L.) 
Common in low woods. 
