GENUS 2. 



BUCKWHEAT FAMILY. 



g. Eriogonum annuum Nutt. Annual 

 Eriogonum. Fig. 1591. 



Eriogonum annuum Nutt. Trans. Am. Phil. Soc. (II.) 5 : 



164. 1833-37. 

 E. Lindheimerianum 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 oblanceo- 

 late, 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"-ij" long, secund, erect, 5-toothed, 

 the teeth obtuse; bracts triangular, not foliaceous; 

 calyx white or whitish, i"-i" long, campanulate, 

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

 achene pointed, less than i" long, its angles smooth, 

 its base almost globular. 



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

 extending into Mexico. July-Sept. 



10. Eriogonum campanulatum Nutt. Narrow-leaved Eriogonum. Fig. 1592. 



Eriogonum campanulatum Nutt. Journ. Acad. Phila. 



(II.) i: 163. 1848. 

 Eriogonum brcvicaulc Nutt. Journ. Acad. Phila. (II.) 



i: 163. 1848. 

 Eriogonum micranthum Nutt. Journ. Acad. Phila. 



(II.) i: 164. 1848. 



Perennial, scapose, stem short, thick and woody, 

 more or less tomentose; scapes erect or nearly so, 

 glabrous, 4'-! 2' tall; leaves crowded, narrowly 

 oblanceolate, spatulate or nearly linear, i'-3' long, 

 obtuse at the apex, narrowed into long petioles, 

 white-tomentose on both sides, the margins some- 

 times revolute ; inflorescence compoundly cymose ; 

 involucres oblong-turbinate, i" long, 5-toothed, 

 teeth obtuse ; bracts triangular, not foliaceous ; 

 calyx yellow, ovoid-campanulate, about i" long, 

 6-cleft, the lobes oblong or fiddle-shaped, emargi- 

 nate ; stamens and style-branches exserted ; 

 achene il" long, enlarged at base. 



Nebraska and Kansas to Oregon, Utah and New 

 Mexico. July-Sept. 



ii. Eriogonum corymbosum Benth. Crisp- 

 leaved Eriogonum. Fig. 1593. 



E. corymbosum Benth. in DC. Prodr. 14: 17. 1856. 



Perennial, woody, densely floccose-tomentose 

 throughout ; stem erect, branched, leafy below, 

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

 the apex, narrowed at the base, petioled, i'-ii' 

 long, their margins more or less crisped ; inflores- 

 cence compoundly cymose ; involucres short-cam- 

 panulate, 5-toothed, about ii" long, the teeth sub- 

 acute ; bracts triangular or triangular-lanceolate, not 

 foliaceous; calyx broadly campanulate, i"-i$" long, 

 constricted near the middle, 6-cleft, the segments 

 fiddle-shaped, emarginate, the 3 inner ones shorter 

 than the outer; style-branches exserted; achene i" 

 long, enlarged at the base, rough on the angles. 



Western Nebraska and Kansas to New Mexico, Utah 

 and Arizona. Aug.-Sept. 



I 



