164 
Aster canescens viscosus Gray, Syn. Fl. i, pt. ii, 206 (1881); Dieteria viscosa Nutt. 
Trans. Amer. Phil. Soc. vii, 300 (1841). 
Gray cites Diplopappus incanus! as a synonym, but to me this seems to be some- 
thing else, Mullen, Septem ber 18 (No. 1834). 
Erigeron bellidiastrum Nutt. Trans. Amer. Phil. Soc. n. ser. vii, 307 (1841). 
Smaller forms of this can not be separated from /, divergens, except by the achenes, 
In F. bellidiastrum these are truncate, tipped with a whitened disk, which bears a 
simple pappus. The pappus of £, divergens is double, the outer of squamellate, 
short bristles. On rich soil, especially among bushes, it becomes 6 to 8 dm. high, 
with larger leaves and heads: Thedford, June 17; Forks of Middle Loup River, 
July 26; Dismal River, June 27 (No. 1850). On poorer soil it becomes lower, 1 to 3 
din. high, more grayish, and with smaller heads and leaves. This form has been 
mistaken for /, divergens: Forks of Dismal River, July 11 (No. 1536). 
Erigeron ramosus beyrichii (Fisch. & Mey.) Smith & Pound, Bot. Surv. Nebr. ii, 
11 (1893); Stenactis beyrichit Fisch. & Mey., Ind. Sem. Petrop. v, 27 (1838). 
This is the common form of /’. ramosum (Walt.) B.S. P., in the central and western 
parts of Nebraska: Plummer Ford, July 3; Dismal River, July 11 (No, 1451). 
Erigeron canadensis L. Sp. Pl. ii, 863 (1753), 
This is a very variable plant. The height varies from 2 m. down to a few em. 
The taller and simpler, or more typical form, was collected on the South Dismal, 
August 12 (No. 1678). In a prairie-dog town near Thedford all specimens were low, 
much branched from the base and very diffuse, These could not be distinguished 
from EF, divaricatus except by their slightly broader leaves, the more racemosely dis- 
posed panicle, and the white rays: August 19 and September 8 (No. 1699). 
Antennaria plantaginifolia (L.) Richards. Bot. App, ed, 2, 30 (1823); Gnaphalium 
plantaginifolium L. Sp. Pl. ii, 850 (1753). 
This is the common Antennaria of the plains extending into the Black Hills of 
South Dakota and the Rocky Mountains. The general habit is that of .1. dioica 
except that the stolons are short, but the heads are more like those of 4, plantagini- 
folia. The leaves are spatulate, 3 to 4 em. long, l-nerved or indistinctly 3-nerved; 
heads about Lem. high; bracts of the sterile heads broad and obtuse; those of the 
fertile ones narrow, acute or obtuse, in both the base light-brown with a papery por- 
tion, constituting more than half the length of the seale. All western forms I have 
seen which were labeled A. plantayinifolia belong here, so also a few labeled 4. 
dioica. It never has those large thin leaves which characterize the eastern 4. planta- 
ginifolia, Tt is common in Nebraska and the Black Hills, but rare in the sand-hill 
region: Thedford, June 15 (No. 1292), 
Iva xanthifolia Nutt. Gen. ii, 185 (1818), 
In old fields: Thedtord, September 7; near Whitman, September 19 (No. 1740). 
In brackish soil near a dry lake, in Grant County, I found a low form with small 
leaves, 3 to 5 em. long, entire or 5-lobed, oblong to ovate, more green beneath; with 
more rounded teeth than in the typical form, and with the heads more or less 
crowded together in glomerules: September 19 (No, 1783). 
Ambrosia artemisizfolia [.. Sp. P1. ii, 988 (1753). 
Not common in the region: West Cody’s Lake, August 10; Thedford, September 
11 (No. 1667). 
Ambrosia psilostachya DC. Prodr. v, 526 (1836), 
As the preceding, very variable. When young, they are very hard to distinguish 
fromeach other, A. psilostachya is very common throughout the region: East ( ‘ody’s 
Lake, August 10; Plummer Ford, August 22; Grant County, near Whitman, August 
‘Lindl. Bot. Reg, t. 1693. 
