78 PROCEEDINGS: BOSTON SOC: IF/IT NATURAL HISTORY. 
P. palustris (L.) Scoj). Occasional on tlic wet pond margins. 
Listed by ./. Maconn: 11. St. .lohti, nos. 1,254, 1,255, and 1,362 (H). 
Fr. — Septcnil)cr. 
P. palustris (L.) Scop, approaching var. parvifolia (Raf.) Fernald 
& Long. See Kliodora, xvi. 10 (1914). Swampy edge of a fresh 
pond, near the east end of Wallace Lake, growing in the same colony 
with P. palitfifris. II. St. John, no. 1,256 (H). 
Fr. — September. 
P. tridentata Ait. Occasional on the sand dunes. Listed by 
J. Macoun; and //. T. Gilssoiv. II. St. John, no. 1,257 (H). 
Fl. — August. 
P. pacifica Howell. See Rhodora xi. 8 (1909). Abundant along 
the brackish beaches of Wallace Lake. //. T. Gilssow (E); //. 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 P>rnald & St. John, n. sp., arcuans deinde pros- 
tratus; turionibus aculeis 3-4.5 mm. longis robustis curvatis re- 
tro rsis valde armatis; foliis plerumque trifoliolatis aliquando quin- 
quefoliolatis vel subquinquefoliolatis; 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- 
aceis 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 spatula tis, 7-11 
mm. longis; fructibus globosis. 
Arching and becoming prostrate: canes of the first year thickly 
beset with strong cur\ed 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 lea\'es ; the coriaceous leaf- 
