STANDLEY TREES AND SHRUBS OF MEXICO 1437 



Leaves palinately nerved. 



Heads in globose axillary glomerules 43. E. pelotrophura. 



Heads not in axillary glomerules. 



Corollas nearly tubular, without distinguishable throat. 



Leaves dark-punctate beneath 65. E. leucoderme. 



Leaves not dark-punctate beneath. 



Leaves elliptical, coriaceous; phyllaries chiefly obtuse. 



66. E. albicaule. 

 Leaves ovate to lanceolate, membranaceous; phyllaries acute. 



Leaves ovate, 2 to 5 cm. wide 30. E. palmeri. 



Leaves lanceolate, 8 to 15 mm. wide. 



31. E. solidaginifolium. 



Corollas abruptly or gradually enlarged into a perceptible throat. 



Leaves lanceolate to rhombic-oblong, entire or nearly so, 4 to 



16 mm. wide. 



Leaves lance-oblong, entire, 3 to 4 times as long as wide, 



vernicose; achenes hispid 68. E. glischrum. 



Leaves rhombic-oblong, entire or undulately few-toothed, 1.5 

 to 2 times as long as wide; achenes glandular-atomiferous. 



89. E. hidalgense. 

 Leaves ovate, serrate or dentate, 2 to 4 cm. wide. 



60. E. saltillense. 

 EE. Heads normally 10 to 18-flowered but occasionally varying within 

 wider limits. 

 Leaves linear to lance-oblong. 



Leaves mostly attenuate, .3-nerved from the base, gray-pubescent 



beneath 70. E. brevipes. 



Leaves acute or obtusish, pinnate-veined, white-tomentose beneath. 



71. E. liebmannii. 

 Leaves (at least the cauline) ovate or ovate-oblong to elliptic or orbicular. 

 Inflorescence lateral; heads pendulous on long filiform pedicels. 



57. E. cremastum. 

 Inflorescence terminal. 



Leaves 8 to 14 cm. wide, deciduous before anthesis. 



72. E. crassirameum. 

 Leaves rarely over 6 cm. wide, persistent to anthesis. 



Inflorescences few(5 to 9) -headed, subsimple, raceme-like. 



73. E. desquamans. 

 Heads many, glomerate or subracemose on spreading panicle 

 branches; corollas little longer than achenes. 

 Petioles of cauline leaves about 3 mm. long; heads 4 to 5 mm. 

 high, densely clustered at tips of panicle branches; phyl- 

 laries 2.5 to 3 mm. long; Veracruz. 



64. E. pseudoperfoliatum. 



Petioles of cauline leaves 9 to 17 mm. long; heads 4.5 to 6 mm. 



long, more loosely clustered; phyllaries 3.5 to 5 mm. long, 



attenuate; San Luis Potosi 62. E. longifolium. 



Petioles of cauline leaves 2 to 4.5 cm. long; heads subrace- 



mosely disposed 63. E. solidaginoides. 



Heads corymbose; corollas 1.5 to 3 times as long as achenes. 



Achenes densely canescent-villous 74. E. rupicola. 



Achenes glabrous or glandular to hispid, not canescent-villous. 

 Pappus half to two-thirds length of corolla. 

 Branchlets terete; leaves of firm texture. 



Leaves elliptic to obovate, obtuse at tip, cuneate at 

 base 75. E. viburnoides. 



