IOWA ACADEMY OF SCIENCES. 
231 
Mentha. 
542. M, canadensis L. Damp ground; abundant, 
SOLANACE^, 
Physalis. 
543. P. virginiana Mill. (P. lanceolata Michx.) Fields 
and waste ground; abundant. 
544. P. hetero^phylla Nees. (P. virginiana Gray.) 
Abundant in cultivated ground. 
SoLANUM. 
545. S. nigrum L. Abundant in cultivated ground. 
546. S. rostratum Dunal. Locally a troublesome weed^ 
but not generally distributed. 
Datura. 
547. P. stramonium L. Rich ground, especially about 
buildings; frequent. 
548. D. tatnla L. With the preceding. 
SCROPHULARIACE^. 
Verbascum. 
549. V. thapsus L. Dry, open woods and pastures; 
abundant. 
Linaria. 
550. L. linaria (L.) Karst. (P. vulgaris Mill.) In streets 
and about houses; locally abundant. 
ScROPHULARIA. 
551. S. marglandica L. {S. nodosa marylandica Gray). 
Waste ground and along streams; common. 
552. S. leporella Bick. With the preceding. It seems 
difficult to separate these two forms. 
Chelone. 
553. C. glabra h. Swampy ground; frequent. 
Pentstemon. 
554. P, grandiflorus Dry, sandy ground; rare. 
Mimulus. 
555. M. ringens L. Wet ground; abundant. 
