412 



POLYGONACEAE 



Polygonum 



55 



Map 837 



Polygonum neglectum Besser 



50 



Map 839 

 Polygonum natans A.Eaton 

 f. genuinum Stanford 



S. F. Gray, Persicaria fluitans (Eaton) Greene, Polygonum amphibium L., 

 and Polygonum amphibium var. aquaticum Willd. I am referring to this 

 species. The nomenclature of this and the next species has long been so 

 involved that their distribution in the state can not be determined from 

 the published records. It is, no doubt, restricted to the lake area of the 

 state. 



Newf., P. E. I., N. S., Que., southw. to Pa. and westw. across the con- 

 tinent to the Pacific Coast States. 



8a. Polygonum natans f. Hartwrightii (Gray) Stanford. Map 840. I 

 am referring to this form all of our reports for Polygonum amphibium var. 

 Hartwrightii (Gray) Bissell, Persicaria ammophila Greene, Persicaria 

 carictorum Nieuwl., and Persicaria Hartwrightii (Gray) Greene. 



Mostly in sedge marshes and on the borders of lakes. 



Newf. and Ont., southw. to N. Y., and westw. to the Pacific Coast States. 



9. Polygonum coccineum Muhl. Map 841. This species is an aggregate 

 to which, since I am not able to separate it satisfactorily into forms and 

 varieties, I am referring all reports from Indiana of the following: 

 Persicaria coccinea (Muhl.) Greene, Persicaria coccinea var. asprella 

 Greene, Persicaria coccinea var. tanaophylla Nieuwl., Persicaria emersa 

 (Michx.) Small, Persicaria grandifolia Greene, Persicaria lonchophylla 

 Greene, Persicaria mesochora var. arenicola Nieuwl., Persicaria Muhlen- 

 bergii (Wats.) Small, Persicaria pratincola Greene, Persicaria tanaophylla 

 Nieuwl., Polygonum coccineum var. pratincola (Greene) Stanford, Poly- 

 gonum emersum (Michx.) Britt., Persicaria mesochora Greene, and Poly- 

 gonum Muhlenbergii (Meisn.) Wats. 



The named variations of this species and the segregates from it are 

 based mostly upon leaf characters, such as the general shape and base 

 of the blades. Using these characters, I have one specimen which belongs 

 to three species. I have a series of specimens of this species all from the 

 same rootstock which might be referred to different species. The species is 

 perennial. One year it may be in deep water, the next year it may be in 



