ST. JOHN: SABLE ISLAND. 71 
P. LAPATHiFOLiUM L. In a potato field, East End Post, J. Macoun 
(C. no. 22,590). 
Fl, f r.— July. 
P. LAPATHIFOLIUM L., \ar. PROSTRATUM Wimmer. Brackish 
beach of Wallace Lake near the Main Life Saving Station. //. St. 
John, no. 1,361 (H). Material of this number was distributed 
under an unpublished manuscript name. 
FL, Fr. — September. 
P. SCABRUM Moench (P. tomentosum Schrank). A weed at the 
Main Life Saving Station. //. St. John, no. 1,213 (H). 
FL, Fr. — August. 
P. Hydropiper L. Introduced around buildings. Main Life Sav- 
ing Station, J . Macoun (C. no. 22,582). 
FL, Fr. — August. 
P. Persicaria L. a weed at the Main Life Saving Station. //. 
St. John, no. 1,214 (H). 
FL, Fr. — August. 
P. hydropiperoides Michx., var. psilostachyum, n. var., 
P. hydropipcroidviu sinuilans sed differt ocreolis glabris eciliolatis, 
marginibus pellucidis; foliis glabris vel glabratis brevioribus, 4-8 
cm. longis, 0.8-2.4 cm. latis. 
Differing from P. hudrojiiprroidc.'i, which has loaves pubescent at 
least on the midril) and near the margins and often throughout, in 
having glabrous eciliolate ocreolae which have scarious transparent 
margins, and in the glabrous or glabrate comparatively short leaves, 
4-8 cm. long, 0.8-2.4 cm. wide. 
Nova Scotia: in muddy ponds and by their borders. Sable Is- 
land, Aug. 3, 1899, ./. Macoun (C. no. 22,583); Sable Island, Sept., 
1911, //. T. Giissow (E); shallow fresh-water pond, Sable Island, 
Aug. 1(), 1913, //. *S7. John, no. 1,215 (H); swampy edge of fresh- 
water pond, Sable Island, -Vug. 23, 1913, //. .S7. John, no. 1,210 
(type in (iray Herb.). Washington: White Salmon, Oct., 1880, 
W. N. Suk!>-dorf, no. 483 (11); Columbia River Bottom, Klickitat 
Co., Oct. 12, 1881, ir. iV. Sulmlorf, no. 5(; (H & P). 
To the last-cited specimen there is a reference in a letter from W. 
N. Suksdorf to Dr. Scrcno Watson, dated Oct. 20. 1S81. " It is an 
indigenous plant no doubt, very frequent on low bottom lands near 
the Columbia River; perennial, tlie prostrate stems rooting at the 
joints, tlie flowering portion mostly ascending." On the list is a 
note in Dr. Watson's handwriting, "but bracts not ciliatc." So it 
