1440 CONTRIBUTIONS FEGM THE NATIONAL HERBARIUM 



Leaves not lepidote. 



Corollas white; rameal leaves (apt to 

 be conspicuously numerous) 

 smaller than the cauline, oval, 

 entire or nearly so; northern 



Mexico. _-93. E. wrightii. 



Corollas roseate or purple-tinged; 

 rameal leaves rarelj' differen- 

 tiated; central and southern 

 Mexico. 

 Leaves thick, firmly coriaceous, 

 glandular-punctate chiefly on 

 the often prominulent and 

 slightly furrowed veinlets be- 

 neath. 



94. E. calophyllum. 



Leaves membranaceous to char- 



taceous, punctate on surface 



between the closely netted 



veinlets beneath,. 95. E. cal- 



aminthaefolium. 



Petioles not over one-tenth as long as the leaf 



blades 96. E. glaucum. 



EEE. Heads 20 to many-flowered. 



Young leaves more or less vernicose; branches arcuate or flexuous 

 usually nodulose; heads large, 1 to 1.5 cm. long; florets little 

 exceeding the involucre. 

 Leaves 1 to 2 cm. long; most of the rameal internodes not over 2 to 7 

 mm. long. 

 Leaves elliptic-lanceolate, about 5 mm. wide, cuneate at base. 



98. E. mygindaefolium . 

 Leaves ovate, about 1 to 1.5 cm. wide, rounded at base. 



99. E. campylocladum. 

 Leaves 3 to 6 cm. long. 



Cauline leaves deltoid-ovate, shallowly cordate, more than two- 

 thirds as wide as long, acuminate, exceedingly glutinous. 



100. E. vernicosum. 

 Cauline leaves ovate-oblong, barely, acute to obtuse, rounded at 

 base, not two-thirds as wide as long, slightly glutinous. 



101. E. multiserratum. 

 Leaves not vernicose. 



Leaves lanceolate to lance or linear-oblong, not one third as wide as 

 long. 



Leaves entire, 1 to 2.2 cm. long 102. E. hyssopinum. 



Leaves serrate, 2.5 to 9 cm. long. 

 Leaves 3-nerved from near the base. 



Petioles (of cauline leaves) 1 to 2 cm. long; leaves subglabrous. 



103. E. riparium. 

 Petioles (of cauline leaves) 1 to 5 mm. long; leaves grayish- 

 pubescent 70. E. brevipes. 



Leaves pinnate-veined, white-tomentose beneath. 



71. E. liebmannii. 



