. 



POLYGOXACEAE. 



5. Eriogonum annuum Xutt. Annual 

 Eriogonum. (Fig. 1290.) 



Eriogonum annuum Xutt. Trans. Am. Phil. Soc. ' II. ) 



5: 164. 1833-37. 

 E. Lindheimenanum Scheele, Linnaea, 22: 149. 1849. 



Annual, white floccose-tomentose throughout, 

 simple or branched, leafy below, naked above, i- 

 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; involucres 

 top-shaped, i"-i%" long, secund, erect, 5-toothed, 

 the teeth obtuse; bracts triangular, not foliaceous; 

 calyx white or whitish, ^ // -i // long, campanulate, 

 6-cleft to beyond the middle, the lobes obovate; 

 achene pointed, less than \" long, its angles 

 smooth, its base almost globular. 



On plains, Nebraska to Texas, west to New Mexico, 

 extending into Mexico. July-Sept. 



6. Eriogonum microthecum Nutt. 

 Slender Eriogonum. (Fig. 1291.) 



Eriogonum microthecum Xutt. Journ. Acad. Phila. 

 (II.) 1:172. 1848. 



Perennial, wood}-, especially below, more or 

 less floccose-tomentose throughout; stem erect or 

 ascending, branched, especially from the base, 

 leafy below, naked above, 6 / -i2 / high. Leaves 

 oblong or oblanceolate, obtuse at the apex, nar- 

 rowed into short petioles, Yz'-i' long, the upper 

 bract-like; inflorescence compoundly cymose; 

 involucres top-shaped, i%" long, 5-toothed, the 

 teeth obtusish; bracts triangular; calyx yellow, 

 white or pink, \%." long, campanulate, at length 

 constricted near the middle ; stamens and style- 

 branches included; achene pointed, i" long, 

 rough on the angles. 



Western Nebraska to Washington, south to New 

 Mexico and California. July-Oct. 



Eriogonum microthecum effusum (Nutt) T. & G. Proc. Am. Acad. 8: 172. 

 Eriogonum effusum Nutt. Journ. Acad. Phila. (II.) i: 164. 1848. 



More densely floccose-tomentose ; stem diffusely branched; leaves linear-oblong or linear; it 

 florescence 2-3 times compound, elongated; flowers white. Nebraska to Montana and X'ew Mexic 



7. Eriogonum corymbosum Benth. 

 Crisp-leaved Eriogonum. (Fig. 1292.) 



E. corj'mbostttnEenth. in DC. Prodr. 14: 17. 1856. 



Perennial, woody, densely floccose-tomentc 

 throughout; stem erect, branched, leafy belov 

 naked above, 6'-i2 f tall. Leaves oblong, obtuse 

 the apex, narrowed at the base, petioled, J^'-i 

 long, their margins more or less crisped; inflor 

 cence compoundly cymose; involucres short- 

 panulate, 5-toothed, about \ l /2 " long, the 

 subacute; bracts triangular or triangular-lanceolat 

 not foliaceous; calyx broadly campanulate, i"-ij 

 long, constricted near the middle, 6-cleft, the 

 ments fiddle-shaped, emarginate, the 3 inner 

 shorter than the outer; style-branches exserte 

 achene i" long, enlarged at the base, rough on 

 angles. 



Kansas to Xew Mexico, west to Utah and Arizot 

 Aug. -Sept. 



1870. 



teet 



