78 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



P. palustris (L.) Scop. Occasional on the wet pond margins. 

 Listed by J. Macoun; H. St. John, nos. 1,254, 1,255, and 1,362 (H). 

 Fr. September. 



P. palustris (L.) Scop, approaching var. parvifolia (Raf.) Fernald 

 & Long. See Rhodora, xvi. 10 (1914). Swampy edge of a fresh 

 pond, near the east end of Wallace Lake, growing in the same colony 

 with P. palustris. H. St. John, no. 1,256 (H). 



Fr. September. 



P. tridentata Ait. Occasional on the sand dunes. Listed by 

 J. Macoun; and H. T. Gussow. H. St. John, no. 1,257 (H). 



Fl August. 



P. pacifica Howell. See Rhodora xi. 8 (1909). Abundant along 

 the brackish beaches of Wallace Lake. H. T. Gussow (E); H. St. 

 John, no. 1,258 (H). 



FL, Fr. August. 



[P. ANSERINA L. Listed by J. Macoun, but is probably P. paci- 

 fica] 



Rubus hispidus L. Known from this area only by a small frag- 

 ment collected by J. Macoun (C. no. 21,139 in part) (H). 



Rubus arcuans Fernald & St. John, n. sp., arcuans deinde pros- 

 tratus; turionibus aculeis 3-4.5 mm. longis robustis curvatis re- 

 trorsis valde armatis; foliis plerumque trifoliolatis aliquando quin- 

 quefoliolatis vel subquinquef oliolatis ; foliolis obovatis acutis vel 

 suborbiculatis coriaceis supra nigri-viridibus subtus pallidi-viridibus 

 grosse dupliciterque serratis, 3.5-8.5 cm. longis, 2-6.2 cm. latis, 

 costa media subter aculeis raris instructa, costis minute pilosis: 

 ramis floriferis prostratis ; foliis trifoliolatis vel simplicibus ; foliolis cori- 

 aceio obovatis grosse dupliciterque serratis 2.5-8 cm. longis, 1.5-7 cm. 

 latis, costis subter pilosis; inflorescentia racemosa vel compositi- 

 racemosa foliosa interrupta, 0.6-3.2 dm. longa; pedicellis 1.5-4 cm. 

 longis, densissime pilosis aculeis aliquando glandulis paucis stipitatis 

 munitis; sepalis lanceolati-ovatis ; petalis albis spatulatis, 7-11 

 mm. longis; fructibus globosis. 



Arching and becoming prostrate: canes of the first year thickly 

 beset with strong curved retrorse bristles, which are 3-4.5 mm. in 

 length: the leaves normally 3-foliolate, but sometimes 5-foliolate 

 or imperfectly so; the leaflets obovate with an acute tip or nearly 

 orbicular, coriaceous, dark green above, light green beneath, coarsely 

 doubly serrate, 3.5-8.5 cm. long, 2-6.2 cm. wide; the midrib armed 

 beneath with scattered prickles; the veins finely pilose: fruiting 

 canes prostrate, with trifoliolate or simple leaves; the coriaceous leaf- 



