ROBINSON. — SPERMATOPHYTES OF MEXICO. 487 



broader and more pyramidal inflorescence, the two forms occurring upon 

 the same individual ; involucre cylindric or in a dried state narrowly 

 oampanulate, the scales stramineous, striate, imbricated in about four 

 very unequal series, the outer ovate, obtuse, pubescent or at least ciliate, 

 the inner oblong-linear, acute, about 8 mm. long ; flowers about 20 : 

 achenes columnar, 3 mm. long, olive brown, slightly hispid on the ribs. 

 — Collected by C. G. Pringle on rocky hills near the city of Chihuahua, 

 13 October, 1885, no. 610 (type, in herb. Gray). To this species I 

 would refer the following specimens: from San Luis Potosi, Schaffner, 

 no. 365, Parry & Palmer, no. 351 ; from Guanajuato, Duges, no. 449; 

 from Zacatecas, Beam, no. 140; from Durango, Palmer, no. 753. This 

 species is nearly related to and has been generally confused with the 

 more southern B. veronicaefolia, Gray, a species which is readily distin- 

 guishable by the extremely fine canescent non-glandular pubescence of 

 its brauchlets, in which the individual hairs cannot be seen without the 

 use of a strong lens. The involucral scales of B. veronicaefolia are 

 more clcsely imbricated and in more numerous rows. 



Var. umbratilis. Heads larger, 1.5 cm. in diameter, terminal upon 

 more elongated branches. — Collected by Dr. Edward Palmer in a shady 

 ravine at Parras, Coahuila, October, 1898, no. 438, and also a solitary 

 individual in a ravine at Mapimi, Durango, no. 521. 



Brickellia vernicosa. Shrub with striate buff or at length gray 

 cortex and erect scabrous-puberulent branches : leaves alternate, ovate, 

 serrate, acutish, bright green, coriaceous, veiny, subsessile, minutely his- 

 pidulous, glandular-punctate beneath, often vernicose, 1 to 1.7 cm. long: 

 inflorescences cylindric thyrses 1 to 1.5 dm. long; bracts leaf-like but 

 very small ; heads subsessile, 1.2 cm. long, on short branches; involu- 

 cral scales about 4-seriate, varying from ovate to linear-oblong, obtuse, 

 minutely granular, striate: slender corollas 7 to 8 mm. long, the upper 

 half violet: achenes slender, columnar, light-colored, 4 mm. long, 

 upwardly hispid; pappus copious, 6 mm. long; styles yellow, only 

 moderately clavate. — Collected by Dr. Edward Palmer at Sautiago 

 Papasquiaro, Durango, "April and August," 1896, no. 57. Related to 

 B. baccharidea, Gray, but readily distinguished by its much longer 

 achenes, etc. ' 



Montaxoa arbouescens, Sch. Bip. (Montagnaea arborescens, DC. 

 Prodr. v. 565). An examination of the type shows that the tips of the 

 pales are recurved as in most of the other species of this genus and not 

 inflexed as unfortunately described in the original characterization. 

 The leaves are oblong-lanceolate, attenuate at each end, rather sharply 



