ROBINSON. MEXICAN PLANTS. 337 



L. C. Smith, Rancho de Calderon, San Juan del Estado, altitude 1,700 

 m., 4 November, 1894, no. 275 ; and by C. & E. Seler at Cuauhtilla, 28 

 November, 1895, no. 1537, between Yanbuitlan and Teposcolula, Oaxaca, 

 3 December, 1895, no. 1430, and Canada Sta. Maria, 8 December, 1895, 

 no. 1596. I take pleasure in dedicating this species to Dr. Theodor 

 Loesener of the Royal Botanical Museum at Berlin. 



E. Nelsonii. Slender shrub, l.G to 3 ra. high: stems terete, striate, 

 dark brown, minutely gray-pubescent, somewhat flexuous ; internodes 

 rather long : leaves opposite, ovate, caudate-acuminate, dentate, about 

 7-nerved from the deeply cordate and more or less hastate base, mem- 

 branaceous, dull-green and finely gray-pubescent upon both surfaces, 8 to 

 10 cm. long, 5 to 8 cm. broad ; petioles flexuous, 3 to 4.5 era. long, 

 puberulent: heads about 16-flowered, numerous, 8 mm. long, borne in 

 op230site axillary and terminal trichotomous nutant corymbs ; peduncles 

 and pedicels pubescent, filiform; involucral scales very unequal, light 

 green, striate, elliptical, obtuse, rounded or erose at the summit, imbri- 

 cated in 3 or 4 rows: corollas at anthesis 4 mm. long, of essentially 

 uniform diameter throughout, thus not clearly differentiated into tube 

 and throat, pale, said to be yellowish : styles dark, strongly clavate ; 

 acheues (of the genus) hispidulous, 3 mm. long, tapering almost from the 

 summit to the base, at length subglabrate and nearly black. — Collected 

 by E. W. Nelson between Ayusinapa and Petatlan, Guerrero, 14 Decem- 

 ber, 1894, no. 2144; by C. G. Pringle on Monte Alban, Oaxaca, altitude 

 1,700 m., 21 December, 1894, no. 5637 (leaves less deeply cordate) ; and 

 by C. & E. Seler, in mountain woods between Yanhuitlan and Teposcolula, 

 Oaxaca, Mexico, 3 December, 1895, no. 1447. Types in herb. U. S. 

 Nat. Museum, herb. Royal Bot. Museum, Berlin, and herb. Gray. This 

 species has the involucre and clavate style-branches of a BrickelUa. The 

 achene, however, is distinctly that of a Eupatorium. 



E. Oerstedianum, Benth. in Oersted, Vidensk. Meddel. 1852, p. 74. 

 Add syn. E. vtmonioides, Coult. Bot. Gaz. xx. 45. 



E. oresbium. Upper part of the stem, peduncles, and pedicels 

 loosely pubescent with a sparse more or less deciduous tawny wool : 

 leaves opposite, ovate, acuminate, rounded or subcordate below, very 

 shortly cuneate at the attachment of the petiole, cuspidate-dentic- 

 ulate, thin, very finely pellucid-punctate, green and glabrous above, 

 scarcely paler and conspicuously villous upon the nerves beneath, 5—7- 

 nerved from a point somewhat above the base, 1.2 to 1.4 dm. long, 1 dm. 

 broad ; petioles 8 to 10 cm. long, puberulent, also tomentose along the 

 grooved upper surface : corymb open, rounded or subpyramidal, tri- 

 voL. XXXV. — 22 



