Eriogonum. 



POLYGONACEiE. 



17 



Flowers glahrous : umbels usually compound : peduncles from a 

 thick short caudex : leaves round to oblong. 

 Leaves oblong-ovate and cordate : peduncle stout, tall : umbel 



compound, of 6 to 10 elongated rays. " 7. E. compositum. 



Leaves oval or rounded : peduncle decumbent : rays few, usu- 

 ally very short and undivided. ' 8. E. Lobbii. 

 Involucres with short erect teeth. 



Flowers villous : dwarf, with a short thick caudex : umbel sim- 

 ple of 1 to 4 short rays : leaves glabrous. 9. E. pyrol^folium 

 Flowers glabrous : diHusely branched at base. 



Umbel compound, villous-tomentose : bracts conspicuous. 10. E. URSINUM. 



Umbel simple, tomentose, 5 - 8-rayed, often subcapitate : 

 bracts and leaves small. 



E. INCANUM. 

 E. MAIIIFOLIUM. 



E. Kelloggii. 



14. E. SPERGTJLINUM. 



15. E. HIRTIFLORTTM. 



Somewhat cespitose : leaves oblanceolate, shortly petioled. 

 More diffuse : leaves ovate or oblong. 

 Involucre solitary on a leafy-bracteate peduncle. 

 Slender annuals : involucres une(iually 4-cleft, pedicellate, in diffuse 

 di- or trichotomous cymes or panicles : flower not attenuate at 

 base. 

 Leaves and bracts linear-oblanceolate, hirsute : involucres 1-2- 



flowered : flowers nearly glabrous. 

 Bracts oblong, hispid : involucres 3 - 5-flowered ; flowers very 

 hirsute. 



* * Involucres nerveless, with 5 rounded erect teeth, pedicellate, in diffuse di- or trichotomous 

 cymose umbels or panicles : bracts ternate, mostly small, triangular and rigid : flower not 

 with stipe-like base. Annuals, mostly glabrous above, with radical roimded leaves. 

 Leaves all radical, or nearly so. 



Flowers glabrous ; outer segments broad and subcordate, the inner 

 much smaller : pedicels very short, deflexed : leaves tomen- 

 tose. 

 Procumbent, glandular, rather rigid. 

 More erect, glabrous above the leaves. 

 Flowers glabrous ; outer seginents oblong or broader above, the 

 inner narrower: pedicels longer: leaves tomentose. 

 Pedicels deflexed : outer segments scarcely broader above. 

 Sparingly branched, low : pedicels minutely glandular : in- 

 volucres campanulate. 

 More dilfuse, taller : pedicels glabrous : involucres narrowly 



turbinate : leaves obtuse. 

 Involucres turbinate-campanulate : leaves acute : flowers more 

 attenuate at base ; outer segments broader above 

 Pedicels erect or spreading : outer segments much broader and 

 rounde<l above. 

 Flowers mostly minutely glandular-hispid, longer than the invo- 

 lucre ; outer segments mostly ovate : pedicels long and fili- 

 form. 

 Leaves floccose-tomentose : stem not inflated. 



Greenish bracts and hemispherical involucres minutely glan- 

 dular : leaves rounded : akene thick-lenticular. 

 Bracts ciliate : involucres smooth, turbinate-campanulate : 



leaves reniform or cordate. 

 Bracts glabrous, minute : involucres glabrous : leaves rounded- 

 ovate : outer segments of perianth often becoming much 

 dilated at base. 

 Leaves villous-pubescent : stem sometimes inflated. 



Diffusely much-branched, very slender ; stem rarely inflated : 



involucres minute : flowers h line long. 

 Less branched and intemodes more elongated ; stem usually 

 inflated : flower and akene a line long. 

 Leaves commonly at the nodes, in the axils of the bracts. 



Tomentose: branches 4- 6-angled : upper leaves lanceolate : invo- 

 lucres hemispherical. 



* * * Involucres 5-6-nerved, with as many .short erect teeth, sessile (rarely pedicellate) and 

 erect : bracts ternate, short and rigid, sometimes foliaceous : flowers not with stipe-like kusc : 

 more or less white-tomentose. 



16. E. BRACHYPODUM. 



17. E. DEFLEXUM. 



18. E. NTTTANS. 



19. E. Watso.m. 



20. E. CERNUU.M. 



21. E. Thurberi. 



22. E. PUSILLITM. 



23. E. reniforme. 



24. E. Thomasii. 



25. E. TRicuoroDUM. 



26. E. IKFLATU.M. 



27. E. ANGULOSl'M. 



