1917] Fernald,— Variations of Polygonum pensylvanicum 73 
1895, Ida A. Keller; swamp, Cold Spring, August 22, 1915, O. H. 
Brown, no. 188 (white-flowered); wet ground east of Briar Island, 
Cold Spring, September 10, 1911, O. H. Brown; dry water hole, Cape 
May, September 10, 1911, O. H. Brown; low ground along marsh, 
Cape May, September 14, 1911, O. H. Brown; waste places in low 
grounds, Cape May, September 24, 1912, O. H. Brown; Race Course 
Pond, West Cape May, September 6, 1911, O. H. Brown. PENNSYL- 
VANIA: Tinicum, Delaware Co., September 23, 1899, B. H. Smith. 
DetawarE: Ruthby, September 12, 1893, A. Commons. VIRGINIA: 
Norfolk, September 6, 1893, A. A. Heller, no. 1241. Sourn Caro- 
LINA: Santee Canal, Ravenel. Misstsstpr1: Saratoga, October 2, 1903, 
Tracy, no. 8768. Muissourr: St. Louis, September, 1848, Geo. Engel- 
mann; Meremac Highlands, St. Louis Co., October 30, 1910, E. B. 
Bartram; common along Swan, Swan, October 1, 1899, Bush, no. 705. 
ONTARIO: marsh at Arnes, near Kingsville, August 9, 1901, J. Macoun, 
Herb. Geol. Surv. Can. no. 54,758. 
A. Leaves glabrous or at most sparsely strigose on the midrib beneath: 
ocreae usually all eciliate: achenes mostly 2.5-3.5 mm. broad. 
B. Stems erect or strongly ascending: leaves lanceolate, acuminate: 
spikes cylindric, long-peduncled: flowers ovoid-oblong. 
Var. laevigatum, n. var., a forma typica recedit foliis subtus 
glabris. — The very common form of the species, occurring from New 
Brunswick to South Dakota, Colorado, and southward. TYPE: 
Rumford, Rhode Island, July 6, 1903, E. F. Williams, in Gray Herb. 
B. Stems depressed or subascending: leaves elliptic to oval, not acumi- 
nate, obtuse or rounded at apex: spikes short-ellipsoid to subglobose, 
short-peduncled to sessile: flowers suborbicular. 
Var. nesophilum, n. var., depressum vel subadscendens, ramis 1-2.5 
dm. longis; foliis glabris ellipticis vel ovalibus nec acuminatis apice 
obtusis vel rotundatis crassis 3-5 cm. longis breviter petiolatis vel 
subsessilibus; spicis breviter ellipsoideis vel subglobosis 0.5-1.8 cm. 
longis breviter pedunculatis vel sessilibus; floribus suborbicularibus 
roseis.— Sandy pond-shores near the sea, Nantucket Island, Massa- 
chusetts, and Block Island, Rhode Island. Massacmuserrs: de- 
scribed by Bicknell as the prevailing form on Nantucket.— Bull. 
Torr. Bot. Club, xxxvi. 452 (1909). Ruopr Istan: sandy border of 
a pond close to the ocean, northern end of Block Island, September 28, 
1916, J. F. Collins, Perley Spaulding and G. F. Gravatt (TYPE in Gray 
Herb.). 
Gray HERBARIUM. 
