304 ROBINSON. 



c. Heads in an open pyramidal panicle 53. E. amplum. 



c. Heads in dense flat or rounded corjonbs d. 

 d. Leaves soft-pubescent beneath e. 



e. Leaves lance-oblong, 6-9 cm. in length; achenes 

 copiously glandular on the faces as well as the ribs 



54. E. angustiJoUum. 

 e. Leaves lance-oblong, 3.5-6 cm. in length; achenes 



not at all glandular on the faces 55. E. pornaderrifolium. 



e. Leaves ovate-oblong, 3-nerved from above the base 



56. E. rorulentum. 

 d. Leaves glabrous beneath /. 

 /. Heads 5-6-flowered; internodes 1-3 mm. long; 



leaves ra]:ely over 1.5 cm. long 57. E. vacciniaefolium. 



f. Heads 12-25-flowered; internodes 1-6 cm. long; 

 leaves rarely less than 2 cm. long g. 



g. Leaves 4-9 cm. long, the exserted veinlets on the 

 lower surface rounded, not furrowed h. 

 h. Leaves lance-oblong to typically oblong, 2-3 

 cm. wide; inflorescence well overtopping the 



foliage 58. E. fasHgiaium. 



h. Leaves broadly elliptic-oblong, 3-3.5 cm. wide; 

 inflorescence about equalled or often surpassed 



by the upper leaves 59. E. tinifolium. 



g. Leaves with the exserted veinlets on the lower 

 surface furrowed i. 

 i. Leaves large, about 1.5 dm. long, coarsely 



toothed 60. E. glijptophlebium. 



i. Leaves much smaller, 2-3.7 cm. long, finely 



cronate-serrate 61. E. theae folium. 



h. Heads 30^0-flowered ^2. E. 'latipes. 



a. Leaves membranaceous, lanceolate to ovate-suborbicular, 

 broadest below the middle; shrubs or more often perennial 

 herbs j. 

 j. Heads 5-19-flowered k: 



k. Leaves cuneate at base, 3-3.5 cm. long 63. E. serratifoHum. 



k. Leaves rounded or cordate at base, 6-18 cm. long I. 

 I. Heads in loose often leafy-bracted pyramidal panicles; 

 leaves caudate-acuminate, the cauline 5-7 cm. wide m. 



VI. Leaves 3-nerved from the base 64. E. solidaginoides. 



m. Leaves 3-nervefl from much above the base. 65. E. celtidifolium. 

 I. Heads in dense flattish corymbs; leaves only acutish, 



the cauline 9-12 cm. wide 66. E. hylibates. 



j. Heads 25-(i()-flowered n. 



n. Leaves linear, alternate 67. E. Trianae. 



n. Leaves broader, opposite (except sometimes a few of the 

 uppermost) o. 

 o. Petioles very short, 1-3 nun. long in the middle cauline 

 leaves, those of the lower leaves sometimes 5-() mm. 

 long p. 



p. Pedicels finely ])uhcscent, the hairs somewliat in- 

 curved or moderately spreading, attenuate, per- 

 ceptibly (imder a microscope) articulated, not 



gland-tipped 68. E. gracile. 



p. Pediccl.s glalirous or nearly so. . . .(68) E. gracile, v. epilobioides. 

 p. Pedicels densely pubescent, the hairs horizontally 



spreading, tipped with spherical glands 69. E. sotarense. 



