18 



ruLYGONACEJ':. 



ErioijOHuin. 



Se<^meut3 of perianth very uueiiual, the outer broad and subcordate : 

 ° cespitose perennials : inHorescence capitate or cyniose-iini- 

 bellate. , i v* i 



Dsusely eesi)itose : leaves round or oblong : head solitary, rarely 

 cyniose. , 



Caudex more difTuse : leaves oblanceolate, acute : umbel J-rayed, 

 sparingly divided. 

 Segments sindlar, nearly eiiual, narrow at base. 



Perennials with short-branched caudex and naked peduncles: 

 bracts small : heads or fascicles solitary, or lew in a long- 



29. 



E. OVALIFOLIUM. 

 E. DICHOTOMUM. 



Dw 



jointed cymose panicle (involucres sometimes solitary), 

 arf, densely cespitose : head solitary : leaves small. In 



oblon. 



Peduncles mostly tall and stout : caudex less branched. 



Heads large and dense, 1 or few : pednncle vciy stout, not 



listulous ; tomentose. • 

 Heads smaller, more numerous : leaves at least tomentose : 



])eduncles n)ore slender, tistulons. 

 Leaves large, villous : peduncles tall, fistulous, smooth. 

 Woody branched perennials : stems very leafy : leaves tascicled 

 and bracts mostly foliaceous : heads more or less closely 

 cymose-unibellate. , ^ i .* 



Flowers villous : leaves round to oblong, obtuse : bracts short : 



heads few and o\iv\\. 

 Flowers glabro\is : leaves ovate to oblong, acute : bracts con- 

 spicuous : heads few, close. 

 Leaves narrowly oblanceolate, acute: umbel short and cymose, 

 often much contracted or capitiite. ,. • i i 



Involucres solitary (terminal and alar) in a repeatedly divided 

 corymb-like cyme : bracts mostly small : leaves not fascicled. 

 Perennial and woody. , ^ x v .,^ 



Low and ditfuse, slender : leaves oblanceolate to linear : um- 

 bel short. , , , 

 Stouter, more rigid, densely tomentose : leaves larger and 

 broader: umbel broadly cymose. 

 Annual : leaves mostly rosulate at base. •,in,v„a 

 Floccose-woolly throughout: leaves oblanceolate: m\olucies 



2 lines long. ,, . , v 



Glabrous above : leaves rounded, small : involucres a line 



long : flowers minute. 

 Hirsute : leaves rounded : involucres glandular. 

 Involucres solitary along the often virgate branches of a naked 

 dichotomous panicle : bra(;ts mostly small. 

 White-tomentose perennials : panicle sparingly branched, usually 

 virgate : involucre toniento.se, teeth not margineil. 

 Much branched at base : leaves ol^lanceolate, acute, olten las- 



cieled : bracts .small, triangular. , , , , 



Sparingly Inanched at base : leaves rounded : bracts laigei, 



subfoliaceous : branches .short. . 



Sparingly branched : leaves lanceolate to ovate : involiUTes 

 larger (3 lines long), distant on the few elongated 

 branches. . . , , 1 1 * 



Woody perennials : panicle diffuse with short rigid braiichlets : 

 involucres short, teeth more or less margined. 

 Glabrate above, divaricately branched, the branchlets sub- 

 spinescent : involucres few, distant, camiuunilate. 

 ,tn«P tnllpr ■ branchlets verv short-jointed : involucrei 



34. E. CINEREUM. 



35. E. PAUVIFOLUIM. 



36. E. FASCICULATUM. 



37. E. MICROTHECUM. 



38. E. CORY.MBOSU.M. 



39. E. TKUNCATUM. 



42. 



E. MoiIAVENSE. 



E. Le.m.moni. 



E. Wriohtii. 



E. SAX ATI I.E. 



44. E. ELONGATU.M. 



Tomentose, taller: branchlets very 

 narrowly turbinate. 

 Annuals : leaves rosulate at base. . 



Tomentose throughout : branches virgate, few : involucres 

 narrow, 2 lines long. 

 Leaves oblanceolate : branches elongated : flowers glabrous. 

 Leaves rounded : more diffuse : flowers villous. 

 More slender and diffuse : involucres smaller. 



Leaves rounded : rather diffuse, often glabrous : involucres 

 narrow, H lines long. 



45. E. Heeumanni. 



46. E. Palmeki. 



E. viroatum. 



E. DASVANTHEMr.M. 



49. E. vimineum. 



