J. C. ARTHUK. CONTRIBUTIONS TO FLORA OF IOWA NO. IV. 169 



Contributions to the Flora of Iowa~No. IV. 



BY J. C. ARTHUR. 



The activity of resident collectors in extending- the state flora 

 has greatly increased since 1876. The quality of the specimens 

 sent has also improved, as well as the liberality with which they 

 are provided for determination or verification. 



It will be seen by the localities in the following list, that the 

 different portions of the state are quite fairly represented, except 

 the three southern tiers of counties west of the immediate vicinity 

 of the Mississippi. This large section when explored, will give a 

 long list of additions. All the western border of the state may be 

 expected to yield many very interesting species which do not ex- 

 tend further east; while no locality in the whole state yet seems to 

 be exhausted. 



The names of the present list are for the preceding two yeai-s. 

 The specimens for them have been furnished by the following per- 

 sons, to whoni 1 am wholly indebted for the material for the pres- 

 ent report: John Leiberg, Seney, Plymouth Co., M. E. Jones, 

 Grinnell, Mis. M. C. Carter, Hesper, Winneshiek Co., E. W. Hol- 

 way, Decorah, Geo. D. Butler, late of Almont, Clinton Co., Fred. 

 Reppert, Muscatine, Dr. Geo. E. Ehinger, Keokuk, R. Burgess, 

 Ames, Dr. J. J. Davis, formerly of Vinton. A specimen of No. 544* 

 is in the Harvard Herbarium at Cambridge, communicated by Dr. 

 Vasey. 



Sl'^ Nasturtium officinale, R. Br. Decorah. 



65*^ Arahis perfoliata, Lam. Vinton. 



84* Viola la/tceolata, L. Muscatine. 



90^ Viola jjedata, L., var. hicolor, Pursh. Muscatine. 



124* TaJinum teretifoUum^ Pursh. Lyons Co. 



237^ Geuni macrophyllwtn^ Willd. Clinton Co. 



344b PotcnUUa tridentata. Ait. Hesper. 



247* Ruhus trijforns, Rich. Hesper. 



299* Archemora rigida^ DC, var. amhlgua, T. & G. Kellogg 

 and Vinton. 



302* Thaspium aureum, Nutt., var. apterum^ Gr. Grinnell. 



306* Herula angustifoUa., Koch. Sioux Co. 



338 G aliifm circcezans, Michx. Keokuk. 



404* Silphiuni trifoliatuni^ L. Clinton Co. 



fProc. D. A. N. S., Vol. III.] 33 [Apr. 39, 1882.] 



