70 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



B. ALBA L. (B. PUBESCENS Ehrh.) Two thousand trees were 

 planted in 1901 in Gourdeau Park and a few are still growing there, 

 but are not over two feet in height. H. St. John, no. 1,199 (H). 



POLYGONACEAE. 



Rum ex Britannic a L. Occurring only along the swampy mar- 

 gins of the fresh-water ponds extending beyond the eastern end of 

 Wallace Lake, near Life Saving Station No. 3. J. Macoun (C. no. 

 22,595); H. St. John, no. 1,200 (H). 



FL August. Fr. September. 



[R. OCCIDENTALS Wats. The plant so listed by J. Macoun is 

 R. Britannica.] 



R. CRISPUS L. Introduced and common near the Life Saving 

 Stations, rare elsewhere. J. Macoun; H. St. John, nos. 1,201, 1,202, 

 and 1,203 (H). 



Fr. August and September. 



R. maritimus L., var. fueginus (Phil.) Dusen. See St. John 

 Rhodora, xvii. 81 (1915). Abundant on the brackish beaches of 

 Wallace Lake, and appearing as a weed in the gardens through the 

 use as a fertilizer of sea-weed collected on the beach of the lake. 

 J. Macoun (C. no. 22,549); H. St. John, nos. 1,204, 1,205,1,206,1,207, 

 and 1,208 (H). 



Fl. August. Fr. September. 



R. ACETOSELLA L. Thoroughly established on the drier parts of 

 the island, especially near the Life Saving Stations. Mentioned by 

 J. Dwight, Jr. (D. pp. 13 &.42). Listed by J. Macoun; and H. T. 

 Gussow; H. St. John, no. 1,209 (H). 

 Fl. August. 



Polygonum Rail Bab. Wet dune hollow, possibly brackish. 

 Known only from the collection, H. St. John, no. 1,210 (H). 

 Fl. August. 



[P. FOWLERI Robinson. The plant so listed by J. Macoun is P. 

 aviculare.] 



P. AVICULARE L. Well established near the Life Saving Stations. 

 J. Macoun (C. no. 22,599, also as door-weed M. p. 218A); H. St. 

 John, nos. 1,211, and 1,212 (H). 

 FL, Fr. August and September. 



