Ill 



POLYGONACEAE 



Polygonum 



50 



Map 843 

 -"olygonum pennsylvanicum 



var. laevigatum Fern. 



50 



Map 844 

 Polygonum pennsylvanicum 



ar. laevigatum f. pallescens Stanford 



50 



Map 845 



Polygonum lapathifolium L. 



10a. Polygonum pennsylvanicum var. laevigatum Fern. (See species 

 references.) Map 843. Frequent throughout the state in habitats similar 

 to those of the species. 



N. B. to S. Dak. and Colo., southw. to Fla. and Tex. 



10b. Polygonum pennsylvanicum var. laevigatum f. pallescens Stan- 

 ford. (See species references.) Map 844. Frequent throughout the state 

 in habitats similar to those of the species. It is probable that some of the 

 specimens referred to this form belong to the preceding variety since it 

 is difficult to distinguish this form in dried specimens. 



Distribution given by Stanford is Vt. to Pa. No doubt it is frequent 

 throughout Ind. if I understand the form. 



11. Polygonum lapathifolium L. (Persicaria lapathifolia (L.) Small.) 

 Map 845. Frequent in low and wet grounds throughout the state, pre- 

 ferring the low borders of streams. It is also found in cultivated and 

 fallow fields. 



Throughout temperate N. A. and also in Eurasia. 



12. Polygonum Careyi Olney. (Persicaria Careyi (Olney) Greene.) 

 Carey Smartweed. Map 846. Very local but usually common where it is 

 found. It prefers a black, sandy soil in pin oak and low black and white 

 oak woods. I found it abundant in black, mucky soil in a fallow field north 

 of Ora in Starke County. The plants are usually about a yard high with 

 few or many branches. 



This species was reported from Jefferson County by Young, but since 

 neither Coulter nor Barnes mention it in their lists of Jefferson County 

 plants, this report may be safely ignored. It has also been reported from 

 Kosciusko and Noble Counties. These reports, no doubt, are correct. 



Maine, Ont., and Mich., southw. to N. J., Pa., and Ohio. 



13. Polygonum Hydropiper L. var. projectum Stanford. (Polygonum 

 Hydropiper L. in part, and Persicaria Hydropiper (L.) Opiz.) (Stanford. 

 Polygonum Hydropiper in Europe and North America. Rhodora 29: 77-87. 



