GENUS 2. 



BUCKWHEAT FAMILY. 



3. Eriogonum Alleni S. Wats. Allen's 

 Eriogonum. Fig. 1585. 



E. Alleni S. Wats, in A. Gray, Man. Ed. 6, 734. 1890. 



Perennial, flocose-tomentose throughout; stem 

 rather stout, erect, sparingly branched above, 

 i-i tall. Leaves oblong, or ovate-oblong, 

 i '-3' long, the basal long-petioled, obtuse at both 

 ends, those of the stem in whorls of 3-5 at the 

 somewhat swollen nodes, short-petioled, nar- 

 rowed at the base, the upper small and bract- 

 like ; inflorescence compoundly cymose ; invo- 

 lucres top-shaped, 5-toothed, 2j"-3" long, the 

 teeth obtusish ; bracts leaf-like, spatulate ; calyx 

 yellow, ii" long, broadly campanulate, its seg- 

 ments obovate or orbicular; stamens and style- 

 branches exserted. 



Stony mountain-sides, Virginia and West Virginia. 

 July-Aug. 



Eriogonum Jamesii Benth. James' Eriogonum. Fig. 1586. 



Eriogonum Jamesii Benth. in DC. Prodr. 14 : 7. 1856. 

 Eriogonum sericeum Torr. ; T. & G. Proc. Am. Acad. 

 8: 155. 1870. Not Pursh, 1814. 



Perennial, base woody, scaly, somewhat 

 branched, stem usually spreading, branched, to- 

 mentose, slender, 6'-i8' long, the branches erect, 

 3 or 4 times forked, light brown or reddish. 

 Leaves mostly basal, spatulate or oblong, i'-4' 

 long, long-petioled, the upper smaller, sessile in 

 whorls of 3 or 4 at the somewhat swollen nodes, 

 all obtuse or subacute, dark green and sparingly 

 tomentose above, densely gray-tomentose beneath, 

 their margins sometimes slightly revolute and 

 crisped ; inflorescence compoundly cymose ; invo- 

 lucres turbinate-campanulate, 2" long, 5-toothed, 

 the teeth rounded ; bracts foliaceous, narrowly 

 oblong or oblong-spatulate ; calyx white or pink, 

 campanulate, villous, 2^"-3" long, its segments 

 oblong or obovate ; stamens and style-branches 

 exserted; achene 2j"~3" long, smooth, villous 

 near the apex, its angles margined. 



On plains, Kansas and Colorado to Texas, Arizona 

 and Chihuahua. July-Oct. 



5. Eriogonum flavum Nutt. Yellow 

 Eriogonum. Fig. 1587. 



Eriogonum flavum Nutt. Fras. Cat. 1813. 

 E. sericeum Pursh, Fl. Am. Sept. 277. 1814. 



Perennial, scapose, white-tomentose throughout, 

 root short, scaly, spindle-shaped, stem very short 

 and thick, simple and solitary or tufted and creep- 

 ing, woody. Scapes 2'-i2 r tall, erect ; leaves 

 crowded on the short stem, linear-oblong or ob- 

 long-spatulate, I '-3' long, mostly obtuse at the 

 apex, flat, narrowed into petioles ; petioles dilated 

 at the base and imbricated ; inflorescence regularly 

 umbellate ; involucres top-shaped, 2"-2*" long, 

 nearly entire, rather densely clustered ; peduncles 

 i'-ii' long; bracts spatulate, foliaceous; calyx yel- 

 low, 3" high, top-shaped, very villous, the seg- 

 ments obovate ; stamens and style-branches ex- 

 serted ; achene constricted at the middle, 2" long, 

 villous at the summit, the angles undulate, the 

 faces swollen. 



Nebraska and Kansas to Alberta and Arizona. June- 

 Sept. 



