POLYGONACE^. (BUCKWHEAT FAMILY.) 31.". 



-*- -»- Branching: leaves radical or at least the peduncles leafless. 

 ■M- Densely wkite-toinentose. 



12. E. tenellum, Torr. Tall : brauches of the woody caudex Bhort aud 

 crowded or elongated: leaves ovate or rounded, tomentose on J>oih sidea: 

 inflorescence rather sparin^^ly branched, glahrous : lluwers white or pinkiuli : 

 outer sepals broadly obovate or orbicular, the inner liuear-obloug. — .S. Colo- 

 rado to Texas aud Mexico. 



•M- ++ Glabrous: involucres turbinate-campamdate. 



13. E. Cernuum, Nutt. Leaves broadli/ ovate, acute: jiedireh drfl, rrd : 

 outer sepals oblong or broader above, recuse. — New Mexico aud Colunulo to 

 Oregou. 



14. E. reniforme, Torr. Low and slender : leares rcni/orm or cordate- 

 orbicular, densely white-tomentose ou both sides: bracts Hmi}t)th, lite munjins 

 ciliate: pedicels lowj and Jilijhnn, raveli/ de/lered, all in tho forks or ifnni- 

 nating the branches : yZoire?-s rose-colored, glabrous. — S. W. Colorado to S. 

 California. 



15. E. Thomasii, Torr. Low and very slender: leaves rounded and orate, 

 small : bracts minute, glabrous: pedicels as in the last: flowers i/ellowish, ofteu 

 reddish, slightly hispid or glabrous : outer sepals often much dibted beluw. 

 — S. W. Colorado to S. California. 



* * Leaves not tomentose. 

 •1- Leaves all radical or nearli/ so. 



16. E. inflatum, Torr. Glabrous, diffusely branching, the stem and 

 internodes often inflated: leaves rounded, usual! i/ cordate aud mostly undulate. 

 pubescent: flowers yellowish, pubescent. — S. W. Colorado to Arizona, Nevada. 

 and S. California. 



17. E. Gordoni, Benth. A similar species, but glabrous throughout, nr 

 the petioles slightly pubescent: flowers glabrous, light rose-4-olor. — Colorado. 



18. E. glandulOSUm, Nutt. Beset with short-stipitate glands: haves 

 small, obovate, somewhat villous : involucres glabrous : flowers slightly hispid. — 

 Collected by Dr. Gambel in Colorado or New Mexico. 



-t- ■»- Leaves developed at the nodes in the axils of ordinary triangular bracts. 



19. E. divaricatUin, Nutt. Low, grayish-pubescent, branching from 

 the base, ])ranches terete: leaves thickish, all rounded or the uj)per obhuic:. 

 petiolulate : involucres very small and few-Howoreil : flowers whitish, iiii- 

 uutely glandular: sepals nearly ecjuiil. — \y. Wyoming to S. \V. Colorado. 



§ 3. Involucres cylindric-turbinate, more or less strongly 5 to G-nerred, and ofltn 

 becoming costate or angled, with as many short erect teeth, sesslU in h<-i,iy ••■■ 

 clusters, or scattered in cymes or along virgate panicled branches : bracts 

 connate at base, more or less rigid : flowers not attenuate at base. 



* Outer sepals broad and somewhat cordate, the inner much narrow^ - 

 scabrous above. 



20. E. ovalifolium, Nutt. Low, densely tomentose and re.^pitoso. with 

 a short closely branched caudex : leaves round or rarely oldong: bract,«» >ory 

 small : involucres in a single close head : flowers rose-<olored, white, or vol 

 low: outer sepals oblong, becoming orbicular, the inner .spalulaio, oftrn 

 retuse. — From Colorado to N. California aud British America. 



