200 PITTONIA. 
on 1 
ocre 2 inches long or more, thinnish, at 
spike oblong, 14 inches long ; bracts ovate: remotely dentate, 
subaristate-pointed : flowers white. 
A rank species of wet lowlands in Idaho and eastern 
Washington, not montane. It is well represented in Sand- 
berg’s n. 400, from Potlatch River, 16 June, 1892, and as 
collected by L. F. Henderson near Moscow, 27 May, 1894; 
both from Idaho, and seen in U. S. Herb. 
The Persicaria section is in need of a thorough revision, 
especially as to the group of aquatic species; but the fol- 
lowing new ones are properly terrestrial. 
P. omissum. Annual, erect, a foot or two high, somewhat 
dichotomous, the whole stem as well as branches and pe- 
duncles rough with rather sparse stipitate glands, but foliage 
glabrous even to the margin; stipules very short, cup- 
shaped or some almost saucer-shaped, none in any part 
truly investing or sheathing the stem, scarious, glabrous, 
naked and even nerveless: leaves about 2 inches long, in- 
cluding the rather long petiole, oblong-lanceolate, puncticu- 
late but not pellucid-glandular: racemes all short and nearly 
oval; perianths large, deep pink, styles exerted: achenes 
round-ovate, cuspidate-mucronate, black and shining, nearly 
flat on one face, notably convex on the other. 
Type specimens collected by myself at Greeley, Colorado, 
20th September, 1872. It is no rarity there and elsewhere 
along the Platte River, and has long been allowed to pass 
for P. Pennsylvanicum. 
P. FALLAX. Annual, erect, rather slender, 1 to 2 feet high, 
simple below, paniculately branched above and copiously 
floriferous, the cylindric spiciform racemes small and nar- 
row: leaves rather narrowly lanceolate, 2 to 4 inches long, 
