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 Yanhuitlan and Teposcolula, Oaxaca, 
3 December, 1895, no. 1430, and Cafiada 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, 1.6 to 3 m. 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, mém- 
branaceous, dull-green and finely gray-pubescent upon both surfaces, 8 to 
10 cm. long, 5 to 8 em. broad; petioles flexuous, 3 to 4.5 cm. long, 
puberulent: heads about 16-flowered, numerous, 8 mm. long, borne in 
Opposite 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 ; 
achenes (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 Brickellia. The 
achene, however, is distinctly that of a Eupatorium 
E. Oerstepranvm, Benth. in Oersted, Vidensk. “Meddel. 1852, p. 74. 
Add syn. Z. vernonioides, 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 em. long, puberulent, also tomentose along the 
grooved upper surface: corymb open, rounded or subpyramidal, tri- 
VOL. XXXy.— 
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