544 POLYGONACEAE. 
tp 5. Eriogonum annuum Nutt. Annual 
Xe, Eriogonum. (Fig. 1290.) 
XS Eriogonum annuum Nutt. Trans. Am. Phil. Soe. (II.) 
WEI or 5: 164. 1833-37. 5 ¢ 
Wins E, Lindheimerianum Scheele, Linnaea, 22: 149. 1849. 
Annual, white floccose-tomentose throughout, 
simple or branched, leafy below, naked above, 1°- 
3° tall. Leaves oblong, oblong-lanceolate or oblance- 
olate, acute or obtuse at the apex, narrowed or acu- 
minate at the base, petioled, the margins somewhat 
revolute or crisped; inflorescence cymose; inyolucres 
top-shaped, 1’//-1'4’’ long, secund, erect, 5-toothed, 
the teeth obtuse; bracts triangular, not foliaceous; 
calyx white or whitish, 14’/-1’’ long, campanulate, 
6-cleft to beyond the middle, the lobes obovate; 
achene pointed, less than 1’ long, its angles 
smooth, its base almost globular. 
Oo 
On pieing, Nebraska to Texas, west to New Mexico, 
i extending into Mexico, July—Sept. 
6. Eriogonum microthécum Nutt. 
Slender Eriogonum. (Fig. 1291.) 
Eriogonum microthecum Nutt. Journ. Acad. Phila. 
(II.) 1:.172. 1848. 
Perennial, woody, especially below, more or 
less floccose-tomentose throughout; stem erect or 
ascending, branched, especially from the base, 
leafy below, naked above, 6/-12’ high. Leaves 
oblong or oblanceolate, obtuse at the apex, nar- 
rowed into short petioles, 4’-2’ long, the upper 
bract-like; inflorescence compoundly cymose; 
involucres top-shaped, 114’’ long, 5-toothed, the 
teeth obtusish; bracts triangular; calyx yellow, 
white or pink, 114’’ long, campanulate, at length 
constricted near the middle; stamens and style- 
branches included; achene pointed, 1/’ long, 
rough on the angles. 
Western Nebraska to Washington, south to New 
Mexico and California. July—Oct. é 
Eriogonum microthécum effusum (Nutt.) T. & G. Proc. Am. Acad. 8:172. 1870. 
Eriogonum effusum Nutt. Journ. Acad. Phila. (II.) 1: 164. 1848. 
More densely floccose-tomentose; stem diffusely branched; leaves linear-oblong or linear; in- 
florescence 2-3 times compound, elongated; flowers white. Nebraska to Montana and New Mexico. 
7. Eriogonum corymbosum Benth. 
Crisp-leaved Eriogonum. (Fig. 1292.) 
EE. corymbosum Benth. in DC. Prodr. 14:17. 1856. 
Perennial, woody, densely floccose-tomentose 
throughout; stem erect, branched, leafy below, 
naked above, 6’—12/ tall. Leaves oblong, obtuse at 
the apex, narrowed at the base, petioled, %4/-14’ 
long, their margins more or less crisped; inflores- 
cence compoundly cymose; involucres short-cam- 
panulate, 5-toothed, about 114’ long, the teeth 
subacute; bracts triangular or triangular-lanceolate, 
not foliaceous; calyx broadly campanulate, 1//-1 14’ 
long, constricted near the middle, 6-cleft, the seg- 
ments fiddle-shaped, emarginate, the 3 inner ones 
shorter than the outer; style-branches exserted; 
achene 1’ long, enlarged at the base, rough on the 
angles. 
Kansas to New Mexico, west to Utah and Arizona, 
Aug.-Sept. 
