Polytaenia 



Umbelliferae 



727 



Oxypolis rigidior (L 



50 



Map 1549 



Pastmaca sativa L. 



0~~ -^3 

 Map 1550 



Heracleum lanatum Michx. 



6102. POLYTAENIA DC. 



1. Polytaenia Nuttallii DC. {Pleiotaenia Nuttallii (DC.) Coult. & 

 Rose.) Map 1547. In a prairie habitat in a few of the northwestern 

 counties. Also found by Dr. Clapp in the "barrens west of the lake" (Har- 

 rison County, southwest of Palmyra). His specimen is in the herbarium 

 of Wabash College. Rare. 



Mich. ( ?) to Wis., southw. to Ala. and Tex. 



6107. OXYPOLIS Raf. 



1. Oxypolis rigidior (L.) Raf. Cowbane. Map 1548. Infrequent 

 throughout the state in marshes, wet borders of lakes, wet woods, swamps 

 and wet interdunal flats. In some large marshes it is common and in 

 these a study of its variation may be made. I have done so and found plants 

 of varying size with all of the leaflets toothed, usually above the middle, 

 some with nearly all of the leaflets entire or some with all of the leaflets 

 entire. Usually the larger plants have larger leaves and the leaflets are 

 more toothed, and the leaves of the smaller plants have fewer teeth or are 

 entire. The form with entire leaflets has been given a varietal name but 

 I believe this is only a form of the species without taxonomic significance. 

 The plants with entire leaflets conform to the type in other characters. 

 The width of the widest leaflets of the plants with entire leaflets is as 

 follows : 2.5 mm ; 5.5 mm ; 6 mm ; 7 mm ; 8 mm ; and 15 mm. 



Wilson reports this species as "common" in Hamilton and Marion 

 Counties. No doubt this report should be referred to Cicuta maculata 

 which is a common plant in those counties and which he does not report. 



N. Y. to Minn., southw. to the Gulf. 



6120. PASTINACA L. 



1. Pastinaca SATiVA L. Parsnip. Map 1549. A weed throughout the 

 state. Rare in only a few areas and infrequent to common along roadsides 



