STANDLEY TREES AND SiJeUBS OF MEXICO 1439 



Leaves pubescent beneath but not arachnoid 

 nor tufted in axils of veins; heads corym- 

 bose. 

 Phyllaries about half length of florets, deep 



purple 86. E. subpenninervium. 



Phyllaries acutish to attenuate, decidedly 

 more than half as long as florets. 

 Phyllaries pale green, not dark-dotted. 



87. E. vernale. 

 Phyllaries dark purple, dotted with dark 



sessile glands 88. E, chiapense. 



Petioles not exceeding 1 cm. in length. 



Petioles at least one-sixth as long as blade. 



Heads (or most of them) sessile or subsessile in 

 small glomerules at tips of panicle branches; 

 leaves oblong, 5 to 10 cm. long; tall shrubs or 

 small trees with pale cortex. 

 Leaves coriaceous; phyllaries rounded to acut- 

 ish at tip 66. E. albicaule. 



Leaves membranaceous; phyllaries attenuate. 

 67. E. ymalense. 

 Heads well pediceled; leaves 1 to 3 (to 5) cm. 

 long. 

 Phyllaries linear to narrowly lanceolate. 



Phyllaries conspicuously 2-ribbed, at least 

 the outer ones beset with dark glands. 

 78. E. brandegeanum. 

 Phyllaries faintly if at all ribbed, not glan- 

 dular. 

 Leaves not punctate, deltoid-ovate. 



Leaves dull green, tawny-puberulent, 



subentire 82. E. hebes. 



Leaves bright green, smooth or nearly 

 so, coarsely toothed. 



83. E. havanense. 

 Leaves dark-punctate, rhombic-ovate to 



ovate-oblong 89. E. hidalgense. 



Phyllaries ovate to oblong, nearly always 

 pubescent or glandular dorsally. 

 Corymbs dense, terminal, ovoid, many- 

 headed, 5 to 10 cm. in diameter; leaves 

 rhombic-ovate, 3 to 5 cm. long. 



90. E. rhomboideum. 

 Corymbs small and numerous, few-headed; 

 leaves rarely above 2.5 cm. in length. 

 Leaves densely canescent-tomentose be- 

 neath, soft in texture, only 5 to 8 



mm. long 91. E. irrasum. 



Leaves glabrous, glandular, or pubescent, 



never tomentose beneath. 



Leaves faintly lepidote above, thin, the 



rameal ovate-oblong and entire or 



nearly so_.92. E. porriginosum. 



57020—26 9 



