330 PROCEEDINGS OF THE AMERICAN ACADEMY. 



ceeding the gradually ampliated throat : achenes slender, brown, attenu- 

 ate below, 3 mm. long. — Collected by E. W. Nelson on eastern slope 

 of Mt. Orizaba, altitude 1,500 to 2,100 m., 21 March, 1894, no. 304. 

 Near SJ. suhpenninervium, Klatt, but with smaller more numerous heads, 

 and with petioles 2 to 3 times as long, etc. 



E. ALBiCAULE, Sch. Bip. in Klatt, Leopoldina, xs. 89 (1884). Add 

 syn. E. drepanophyllum^ Klatt, Ann. k. k. Naturh. Hofmus. Wieu, ix. 

 356 (1894). The type of the latter species stated by Dr. Klatt as col- 

 lected by Scniwne is Gaumer's no. 122 from Cozumel Isl. 



E. ALBICAULE, Sch. Bip., var. laxius. Inflorescence somewhat looser 

 than in the type: scales of the invDlucre linear-attenuate, 5 mm. long. — 

 Collected by Dr. Edward Palmer in Ymala, Mexico, 16 to 25 August, 

 1891, no. 1474 (type) and by Dr. J. N. Rose at Rosario, Sinaloa, 7 

 July, 1897, no. 1566. Dr. Rose's no. 1839 from the same locality is 

 probably the same, although the inflorescence is still more open. 



B. amblyolepis. Smoothish herb or undershrub, 3 to 6 dm. high; 

 stems slender, terete, at first puberulent, soon glabrate and lucid, copi- 

 ously branched ; branches opposite, ascending : leaves opposite, lanceo- 

 late, acute to attenuate at each end, serrulate to subentire, thin, green, 

 glabrous, and somewhat lucid, minutely pellucid-punctate, 5.5 cm. long, 

 1.3 cm. broad, 3-nerved from somewhat above the cuneate base; petioles 

 4 to 6 mm. long : heads small, numerous, in flat-topped corymbs ; pedi- 

 cels 5 to 8 mm. long, bracteolate near the summit ; involucral bracts 

 about 13, in 2 subequal series, obovate-oblong, pale green, striate, 

 rounded and ciliolate at the summit, 3 mm. long, at length spreading: 

 flowers about 15, small : corolla probably white, 3.5 mm. long, somewhat 

 exceeding the very delicate and rather sparse bright white pappus : achenes 

 1.5 mm. long, black, minutely roughened on the sharp angles. — Collected 

 by C. G. Pringle on cool ledges of the Sierra de Tepoxtlan, 24 km. north- 

 east of Cuernavaca, altitude 2,300 m., 7 February, 1899, no. 8034. 



E. AREOLARE, DC, var. leiocarpum. Nearly glabrous throughout: 

 flowers somewhat larger than in the typical form and borne in condensed 

 cymes : achenes smooth. — Collected by E. W. Nelson, near Chilpan- 

 cingo, Guerrero, Mexico, altitude 2,700 to 3,100 m., 24 December, 1894, 

 no. 2221. Types in herb. Gray and herb. U. S. Nat. Museum. There 

 are no marked differences between the typical form of this species and the 

 later E. tiihiflorum, Benth. PI. Hartw. 76, so far as the tolerably detailed 

 descriptions indicate. Hemsley refers to Ghiesbreght's no. 530 under 

 both names. The vaguely characterized E. papantlense of Lessing may 

 perhaps be the same. 



