IOWA ACADEMY OF SCIENCES. 
225 
POLYTiENIA. 
457. P. nuttallii DC. Prairies; frequent. 
Thaspium. 
458. T. harhinode (Michx.) Nutt. Damp woods. 
Infrequent. 
Aethusa. 
459. A, cynapium L. Roadsides; infrequent. 
Erynoium. 
460. E, aqwatic'wm L. (E. yucccefoUum Michx.) 
Meadows; common. 
Sanicula. ‘ 
461. S, marylandica L. Woods; abundant. 
PiMPINELLA. 
462. P. integerrima (L.) Gray. Dry or stony ground; 
- common. 
Washingtonia. 
463. W. claytoni (Michx.) Brit. (Osniorrhiza hrevi- 
stylis D C.) Abundant in woods. 
SlUM. 
464. S, cicutcefolium Gmel. Swamps; infrequent. 
Apium. 
465. A. petroselimcm L. Rarely escaped. 
ZiZIA. 
466. Z. aurea (L.) Koch. Woods and meadows; abun- 
dant. 
CiCUTA. 
467. C. maculata L. Wet meadows and swamps; 
abundant. 
Deringa . 
468. B. canadensis (L.) Kuntze. {Cryptotcenia canaden- 
sis DC.) Abundant in woods. 
CORNACE^. 
CoRNUS. 
469. C, circinata L’Her. Rocky river banks; Common . 
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