1438 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Leaves ov^ate, caudate-acuminate at tip, cordate at 



base 69. E. areolare. 



Branchlets tetragonal; leaves thinly membranaceous. 



76. E. tetragonum. 

 Pappus at least three-fourths length of corolla. 

 Leaves pinnate-veined. 



Leaves about 7 cm. long, acuminate, subglabrous above; 

 petiole about one-eighth as long as blade. 



77. E. adenachaenium. 



Leaves about 5 cm. long, obtusish to acute, sparsely 



setulose above; petiole about one-fourth as long as 



blade 58. E. lucidum. 



Leaves palmately or subpalmately nerved. 

 Phyllaries somewhat vernicose. 



Phyllaries lance-linear, attenuate. 



Leaves membranaceous, obtuse, coarsely crenate- 

 dentate, pubescent beneath. 



78. E. brandegeanum. 

 Leaves subcoriaceous, acuminate, subentire, gla" 



brous or nearly so 80. E. subintegrum. 



Phyllaries oblong, obtusish or merely acute. 



Leaves rhombic-ovate to oblong, cuneate at base; 

 lateral inflorescences on short suberect 



branches 79. E. glabratum. 



Leaves prevailingly ovate, mostly subtruncate or 

 rounded at base; lateral corymbs on spreading- 



ascending branches 81. E. espinosarum. 



Phyllaries not vernicose. 



Petioles (of cauline leaves) 1.2 to 7 cm. long. 



Cauline leaves reniform-ovate, cordate, coarsely 

 crenate, broader than long. 

 ^ 61. E. hederaefolium. 



Cauline leaves ovate (deltoid with rounded angles), 

 about as wide as long, ferruginous beneath. 



82. E. hebes. 

 Cauline leaves ovate to oblong, longer than broad, 

 not ferruginous. 

 Phyllaries elliptic, obtuse or barely acute. 



24. E. haenkeanum. 

 Phyllaries lanceolate or narrowly oljlong-linear 

 acute to attenuate. 

 Leaves glabrous beneath. 



Phyllaries dorsally glabrous, nerveless or 

 obscurely nerved; leaves 2.5 to 4.5 cm. 

 long, subcoriaceous_83. E. havanense. 

 Phyllaries dorsally glandular-atomiferous 

 and puberulent, 1 or 2-costulate; leaves 

 6 to 10 cm. long_84. E. gracilicaule. 

 Leaves somewhat arachnoid-pubescent be- 

 neath, at least tufted in axils of the larger 

 veins; heads in a mostly elongate thyrse. 

 85. E. raairetianum. 



