ROBINSON. — SPERMATOPHYTES OF MEXICO. 481 
sparingly pubescent when young, quite glabrate except on the nerves 
and somewhat lucid in age, nigrescent in drying, the teeth salient, mu- 
cronulate ; petioles 1.8 to 3 cm. long: heads medium-sized, about 25- 
flowered, 8 to 10 mm. long, in an opposite-branched corymbose panicle ; 
involucral scales 3—4-seriate, ovate to lanceolate, acuminate, closely im- 
bricated externally, nigrescent at the tip, pale at the base, ciliolate, 
silvery and lucid on the smooth inner surface: corolla-tube 5 to 6 mm. 
long, glabrous, gradually narrowed from the summit to the base, the 
teeth very short, sparingly pubescent: achenes 2 mm. long, dark, glab- 
rous, lucid, the angles very prominent; pappus rather copious, white, 
nearly equalling the corolla. — Collected by Heyde and Lux at Nebaj, 
Depart. Quiché, Guatemala, altitude 2,150 m., April, 1892, being no. 
3387 of Mr. John Donnell Smith’s sets of Central American plants, and 
having been distributed as HZ. Tuerckheimii, Klatt, a species with much 
" Narrower leaves and linear-oblong involucral scales, glabrous stem, etc., 
well shown by no. 77 of Mr. John Donnell Smith’s sets. 
Eupatorium lyratum, Coulter, Bot. Gaz. xvi. 96 (1891), is Conyza 
lyrata, HBK. 
Eupatorium Mariarum. Herbaceous; stems terete, weak, pithy, 
obscurely pulverulent-puberulent and also covered with scattered spread- 
ing white trichomes; branches ascending: leaves opposite, long-petioled, 
deltoid, acute, coarsely crenate except at the abruptly contracted base, 
thin, deep green and bearing a few scattered white trichomes above, 
somewhat paler and essentially glabrous beneath, 3-nerved from the 
slightly acuminate point of attachment, 5 to 7 cm. long, 4 to 5 cm. 
broad ; petioles weak, flexuous, 3 to 5 em. long, with a double pubes- 
cence as on the stem: heads about 25-flowered, in small axillary and 
terminal corymbs, pedicellate ; bractlets acute, lance-linear to filiform ; 
involucral scales linear-oblong, acute, subequal, thin, mostly 2-nerved, 
green, 3 mm. long: corolla (probably white) glabrous, with a slender 
proper tube exceeding a much broader well-marked throat and spreading 
limb: achenes dark-brown, slightly spindle-formed, hispidulous toward 
the summit. — Collected by E. W. Nelson on Maria Madre Island of 
the Tres Marias Group, May, 1897, no. 4244. At first taken for 
£, pazcuarense; HBK., but clearly distinct = its long petioles, different 
leaf-contour and dentation, also in its pubesce 
Eupatorium pachypodum. Caudex cts lignescent, branched; 
Stems annual, one to several, erect, simple to the inflorescence, 3 to 4 ise 
high, terete, cinereous-tomentulose: leaves opposite, small, much ex- 
ceeded by the internodes, ovate to suborbicular, acute, rounded at the 
VOL. XXXVI.— 
