ROBINSON. — SPERMATOPHYTES OP MEXICO. 475 



branches, elliptic-ovate, acute or acutish at each end, short-petioled, 

 sharply serrate, green, resinous-dotted, and pubescent on the upper sur- 

 face, slightly paler and pubescent upon the pinnately arranged veins 

 beneath : tlowers in short few-flowered axillary cymes : calyx-lobes ovate, 

 caudate-acuminate, externally pubescent toward the sharp tip, 4 mm. 

 long: corolla bright scarlet, 1.2 cm. long, with cylindrical tube and 4 

 short rounded subequal lobes, the upper one broader and emarginate. — 

 Collected by C. G. Pringle on the Sierra de Tepoxtlan, State of 

 Morelos, Mexico, altitude 2,300 m., 11 September, 1900, no. 9445. 

 Readily distinguished from all the other species by the callosities on 

 the rib-like angles of its stems, 



Piqueria pyramidalis. Stem terete, 2 to 2.5 m. high, puberulent, 

 green but maculate with elongated dark brown or purplish dots : leaves 

 alternate (at least the upper ones), petiolate, broadly ovate, shallowly 

 about 7-lobed, coarsely crenate, 3-nerved from the rounded to strongly 

 cordate base, green and scabrous-puberulent above, paler and tomentulose 

 beneath, the larger 1.7 dm. long and about as broad; petioles subterete, 

 tomentulose: small and very numerous heads in pedicellate racemose 

 glomerules ; these forming a large leafy -bracted pyramidal panicle : in- 

 volucral scales oblong, green, about 2-seriate, 2.5 to 3 mm. long, puberu- 

 lent and covered with minu'e amber-colored particles upon the outer 

 surface: corolla white, 3 mm. long, with short proper tube and relatively 

 large throat, also bearing a few amber-colored particles : styles much 

 exserted, clavate, purplish or brown ; achenes dark-colored, glabrous, 

 lucid, 2.5 mm. long. — Collected by C. G. Pringle in shade of cliffs on 

 mountains above Iguala, altitude 1,230 m., 10 October, 1900, no. 8389. 

 Type in herb. Gray. This species, although possessing all the technical 

 characters of the genus, differs considerably in habit from the other Mex- 

 ican species, being in fact nearer some of the South American, 



Ageratum lucidum. Shrub with buff cortex and opposite spread- 

 ing curved-ascending terete finely striate glandular-puberulent branches : 

 leaves opposite, ovate, acutish, serrate from below the middle, thin, veiny, 

 glabrous or early and completely glabrate upon both surfaces and lucid 

 especially above, 4 cm. long, half as broad, ciliolate upon the margin, 

 3-nerved from somewhat above the abruptly acuminate shortly petiolate 

 base, minutely white-dotted beneath and also covered with globular 

 resinous or glandular atoms : corymbs long-peduncled (often irregularly 

 compound), 2-6-headed and subtended by reduced opposite lance-oblonw 

 to linear sessile bracts; pedicels 1 to 2.4 cm. long, curved-a,scendinff, 

 1-headed with or without 1 or more filiform bractlets; heads campanu- 



