STANDLEY TREES AND SHBUBS, OF MEXICO 1441 



Leaves ovate, oblong, or suborbicular, more than one-third as wide 

 as long. 

 Petioles 1 to 2 mm. long, not one-tenth as long as leaf blades. 



97. E. rhodopodum. 

 Petioles rarely less than 1 cm. long. 

 Leaves rounded at apex. 



Cinereous-tomentellous; leaves mostly deltoid-ovate and 

 shallowly cordate; branches 6-angled; corymbs 3 to 5 

 (to 9) cm. in diameter; phyllaries acute, green. 



104. E. tomentellum. 



Ochraceous-tomentellous; leaves suborbicular-ovate, abruptl}' 



pointed to rounded or rarely cordate at base; branches 



subterete; corymbs 9 to 12 cm. wide; phyllaries obtuse, 



ochraceous 105. E. loesenerii. 



Leaves acute to acuminate. 



Heads 4 to 4.5 mm. high; leaves 2 to 4 cm. wide, entire at the 



obtusely pointed base 106. E. malacolepis. 



Heads 5 to 7 mm. high; leaves 5 to 12 cm. wide, incisely 

 toothed to the cuneately decurrent base. 



107. E. conspicuum. 

 Heads 6 to 11 mm. high; leaves not toothed to base. 



Leaves areolate above by a fine prominulent reticulation of 

 veinlets, narrowly ovate, caudate-acuminate. 



69. E. areolare. 

 Leaves not noticeable areolate, acute or moderately acumi- 

 nate. 

 Leaves palmately 3-nerved from a usually rounded base. 

 Decumbent, fruticulose; corymbs mostly 2 to 5-headed. 



108. E. oligocephalum. 

 Erect shrubs with many-headed corymbs. 



Phyllaries oblong, obtuse, erose, scarious-margined. 



109. E. aschenbornianum. 

 Phyllaries lance-linear, acute to attenuate, subher- 

 baceous throughout. 

 Achenes obscurely puberulent to glabrous; heads 

 20 to 25-fiowered; phyllaries acute, about half 

 as long as florets; leaves rounded or but sub- 

 cordate at base; pubescence not glandular. 



110. E. etlense 

 Achenes distinctly hispid; heads 30 to 40-flowered; 

 phj'llaries attenuate, more than half as long 

 as florets; leaves subtruncate to deeply cordate 

 at base; inflorescence glandular-pubescent. 

 Leaves deltoid-ovate, 1 to 3 (to 4) cm. wide- 

 petiole 4 to 10 mm. long. 



111. E. scorodonioides. 

 Leaves broadly ovate with rounded sides; 

 petiole mostly 2 to 6 cm. long. 



112. E. petiolare. 

 Leaves pinnately 5-nerved or palmately 3-nerved from a 

 point above the base. 

 Inflorescence (if normally developed) elongate, forming 

 an ovoid to subcylindric thyrse. 



