IOWA ACADEMY OF SCIENCES. 231 



Strophostyles Ell. 



349. S. Iielvoia (L.) Brittoii. {S. aiujulosa Ell; Pliaseolus: 



diveysifnliiis Pers.) River banks near Arm- 

 strong^ ; rare. 



350. N. jxiHciffoya (Bentli.) S. Watson. {Phaseolus 



pancifforus Benth.) Sandy shore of Swan Lake; 

 rare. 



OX.'\LlDACE.E. 

 OXALIS L. 



851. (). ciolacea L. Violet Wood-sorrel. Woods and 



prairies; very common. 



852. 0. sU'icfa L. {(). corn icii lata var. strict a Sav.) Yel- 



low Wood-sorrel. Very common. 



LINAGES. 

 LiNUM L. 



853. L. stdcdtuiii Riddell. Wild Flax. Frequent on 



dry prairies. 



854. L. uxitatissinuim L. Flax. Escaped from cultiva- 



tion to roadsides, where it persists for a year or 

 two. 



RUTACS^E. 



Xanthoxylum L. 



855. A'. (uucricauKiii Mill. Prickly Ash. A prickly 



shrub, frequent in woods. 



polygalace^. 

 Polpgala L. 



856. P. rerticilUitd L. Frequent on low prairies. 



857. 1\ r/ridescen.s L. (7^ saiujidnca L.) Very rare; 



prairies near Armstrong. 



EUPHORBIACE^. 

 ACALYPHA L. 



85S. A. riryinica L. Common in the w^oods south of 

 Iowa Lake. 



