36 Rhodora [February 



this species tends to be restricted to dry situations and the other to 

 wetter places. 



Alnus incana (L.) Moench. 



URTICACEAE. 



Urtica lyalli Wats. — One colony on rocky shore; mature fruit. 



POLYGONACEAE. 



Rumex crispus L. — The common dock of fresh water marshes, 

 etc.; mature fruit. 



Rumex pallidus Bigel. — The beach dock; mature fruit. 



Rumex acetosella L. — Common. 



Polygonum fowleri Robinson. — Only one mat observed; on 

 beach; immature fruit. 



Polygonum aviculare L. var. littorale (Link) Koch. — On 

 tennis court; flowers to immature fruit. 



Polygonum hydropiper L. — In bogs; mature fruit. 



Polygonum persicaria L. — "Heart's ease." In gardens, flow- 

 ers to mature fruit. Decoctions of this plant and of pennyroyal are 

 used as driving potions, as in measles and colds, also for pain in gen- 

 eral. 



CHENOPODIACEAE. 



Chenopodium album L. — In gardens; mature fruit. 

 Atriplex patula L. var. hastata (L.) Gray. — Common along 

 shore; mature fruit. 



Salsola kali L. — On sandy beaches; mature fruit. 



CARYOPHYLLACEAE. 



Spergularia rubra (L.) J. & C. Presl. — The typical form occurs 

 in dense tufts or colonies of short plants on bare banks along shore; 

 occasionally one encounters a long lax variety referable to var. peren- 

 nans (Kindb.) Robinson. Referred to this also is a compact fleshy 

 mat collected in a wet peaty pasture; mature fruit. 



