232 BOTANY. 
PoLyGonuM ImBRIcATUM, Nutt. (Watson, in Am. Naturalist, 7, p. 665).— 
Low, 1 to 8 inches high, slender, often diffusely branched, smooth; spikes 
short, dense; bracts loosely imbricated, linear or oblong, 2 to 4 lines long, 
with sometimes a narrow scarious margin, acute; sepals colored; stamens 
3 or 5; styles one-third as long as the ovary; achenium glabrous.—South 
Park, Colorado, July, 1873, Wolf (36). 
Potycgonum ampuisium, Linn.—Utah, 1871, 1872, Watson’s Report; 
Colorado, 1873, Wolf (38). 
PoLyGonuM ampuisiuM, L., var. MuHLensercu, Meisn. in DC. Prod. 
14, p. 116—Camp Crittenden, Arizona, at 5,000 feet elevation, Septem- 
ber, 1874, Rothrock (670). As in some of our Eastern specimens, the 
peduncles are glandular-scabrous. 
Potyconum Persicaria, Linn—Utah, 1871, 1872, Watson’s Report. 
. Introduced. 
Potygonum novosum, Pers. (Meisner in DC. Prod. 14, p- 118)—Stem 
with the nodes much enlarged, 2 to 6 feet high; ochrez loose, becoming 
glabrate, minutely ciliolate; leaves oblong or lanceolate, glandular-punctate 
beneath, the lowest short-oval or ovate, the highest linear, the middle ones 
6 to 8 inches long and 1 to 2 wide, tapering into a long acumination; spikes 
racemose, linear, attenuated upward, loose, nodding, on glabrous peduncles; 
bractlets ovate, acute, naked, longer than the pedicels; calyx flesh-colored 
or white, without glandular dots, slightly nerved, including the 6 stamens 
and 2-parted style; achenium lenticular, rarely triangular—San Luis 
Valley, Colorado, September, 1873, Wolf (40); Zuni Village, New 
Mexico, at 6,500 feet elevation, July, 1874, Rothrock (160); Camp 
Lowell, Southern Arizona, August, 1874, Rothrock (702). 
Potycoxnum Hyproprrrr, Linn.—Sanoita Valley, Arizona, at 4,500 feet 
elevation, September, 1874, Rothrock (688). Introduced ? 
Potyeoxum viviparum, Linn.—South Park, Colorado, J uly, 1873, 
Wolf (438). 
PoLygonuM Pare Linn.—South Park, Colorado, July, 1873, Wolf 
(44). Var. ostoneirotium, Meisner, Willow Spring, Arizona, at 7,202 feet 
elevation, July, 1874, Rothrock (228). 
