4G2 PROCEEDINGS OF THE AMERICAN ACADEMY. 



golden yellow, 2-toothed at the tip, about 4 mm. long ; fructiferous bracts 

 i without hood or appendage) marked with 3 rows of tubercles upon each 

 lateral surface. — Collected by Dr. J. N. Rose between Rosario and 

 Conception, Sinaloa, no. 3271. Type in herb. U. S. Nat. Museum. 



Var. subintegrum. Leaves clasping at the base but their margins 

 anlobed, obsoletely crenate-serrate. — Collected by Dr. J. N. Rose at 

 Rosario. Sinaloa. 7 July, 1897, no. 1568. 



20. M. inimulifolium. Dichotomously branched herb; stems pur- 

 plish-streaked, loosely villous and finely pubescent along a longitudinal 

 line : leaves lanceolate, acuminate, entire or obsoletely serrulate, 5 to 7 cm. 

 long, 1.2 to 2 cm. broad, appressed-pubescent upon both surfaces, some- 

 what narrowed to an auriculate amplexicaul base: peduncles in the 

 forks of the stem, 4 cm. long, filiform, covered with a fine spreading 

 pubescence: outer involucre 5-parted; segments ovate-lanceolate, acute, 

 somewhat accrescent, appressed-villous : ligules about 8, short-oblong, 

 2 3-toothed : fruit short, broad, somewhat quadrate, without hood or 

 appendage, compressed, thin, depressed upon the lateral faces, finely 

 tuberculate dorsally. — Collected by E. W. Nelson in the vicinity of 

 Totontopec, Oaxaca, altitude 1700 to 2150 m., 15 July, 1894, no. 740. 

 Type in herb. U. S. Nat. Museum. The foliage recalls that of Stimulus 

 ringens. 



= = Leaves neither cordate nor auriculate-clasping (except obscurely so in 



M. gradlt ). 



a. Divisions of the outer involucre 3, ovate to ovate-lanceolate, acute or acuminate. 



21. M. panicdlatum, Gardn. in Hook. Lond. Jour. Bot. vii. 287 

 (184*). — Eastern and Central Brazil. 



22. M. GRACILE, Less. Leaves rhombic, unlobed or panduriform, 

 more or less narrowed to an obscurely auriculate or at least obtuse base. 

 — ■ Linnaea, vi. 407 (1831). — Papantla, Schiede & Dcppe ; Tautoyuca, 

 Buasteca, Ervendberg, no. 92; Jalapa, C. L. Smith, no. 1605. 



_'.;. M. OBLONGIFOLIUM, DC. Leaves oblong to oblong-lanceolate, 

 acute to attenuate at the base, never lobed. — Prodr. v. 519 (1836). — 

 Vera Cruz, near Orizaba, Ihtteri, no. 809, Section, no. 461, Cordova, 

 Bourgeau, no. L628, near Tantoyuca. Berlandier, no. 733; Oaxaca, at 

 San Felipe, Conzatti & Gonzalez, no. 560: Michoacan, Pringle, no. 

 1322 MoreloB, Pringle, do. ~-'>'2\ ; Costa Rica, Pittier, no. 6963. 

 6. Divisions of the outer involucre 6, obliquely acuminate. 



24. M. MICEOCEPHALUM, Less. Linnaea, ix. 268 (1834). — This 



species is known to me only from Lessinn's characterization and from an 



ilent tracing, prepared from the type ;it Berlin by Mr. J. M. Green- 



