236 
IOWA ACADEMY OF SCIENCES. 
APIACE^. 
Heracleum L. 
896. H. lanatum Michx. Cow Parsnip. Infrequent in 
woods. 
Pastinaca L. Parsnip. 
897. P. sativa L. Escaped from gardens; a native of 
Europe. 
Thaspium Nutt. 
898. T. trifoliatum aureum (Nutt.) Britton. (T. 
aureum Nutt.) Meadow Parsnip. Woods west 
of Estherville. 
Eryngium L. 
899. E. aquaticum L. ( E . yucccefolium Michx.) Rattle- 
snake Master. Very common on prairies. 
Sanicula L. 
400. S. canadensis L. Snakeroot. Common- in woods. 
PlMPINELLA L. 
401. P. integerrima (L.) A. Gray. Woods, Iowa lake, 
infrequent. 
Washingtonia Raf. Sweet-Cicely. 
402. W.claytoni (Michx.) Britton ( Osmorrhizabrevistylis 
D C.) Frequent in rich woods. 
Sium L. 
403. S. cicutcefolium Gmel. Common in sloughs, and 
margins of ponds. 
Zizia Koch. 
404. Z. aurea (L.) Koch. ( Thaspium aureum var. 
apterum A. Gray.) Meadow-parsnip. Very 
common on low prairies. 
405. Z. cor data (Walt.) D C. ( Thaspium trifoliatum 
var. apterum A. Gray.) Frequent on dry 
prairies. 
Carum L. Caraway. 
406. C. carui L. Adventive from Europe. 
