ROBINSON. — SPERMATOPHYTES OP 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- 

 llowered, 8 to 10 mm. long, in an opposite-branched corymbose panicle ; 

 involucral scales 3-4-seriate, ovate to lanceolate, acumiuate, 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. Quiche, 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 E. 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 hjratum, Coulter, Bot. Gaz. xvi. 96 (1891), is Conyza 

 lyrata, II BK. 



Eupatorium Mariarum. Herbaceous ; stems terete, weak, pithy, 

 obscurely pulverulent-puberulent and also covered with scattered spread- 

 ing white trie-homes; 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 cm. 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, 

 o-reen, 3 mm. long: corolla (probably wdiite) glabrous, with a slender 

 proper tube exceeding a much broader well-marked throat and spreading 

 limb: achenes dark-brown, slightly spindle-formed, hispiduloua toward 

 the summit. — Collected by E. AV. Nelson on Maria Madre Islam] of 

 the Tres Marias Group, May, 1897, no. 4244. At first taken for 

 E. pazcuarense, HBK., but clearly distinct by its long petioles, different 

 leaf-contour and dentation, also in its pubescence. 



Eupatorium pachypodum. Caudex thickish, lignescent, branched; 

 stems annual, one to several, erect, simple to the inflorescence, 3 to 4 dm. 

 hio-h, terete, cinereous-tomentulose : leaves opposite, small, much ex- 

 ceeded by the internodes, ovate to suborbicular, acute, rounded at the 

 vol. xxxvi. — 31 



