342 PROCEEDINGS OF THE AMERICAN ACADEMY. 



obtuse, tufted at the cuspidate apex, 8 to 9 mm. long, usually carinate, 

 pale green with broad diaphanous margins ; glands biseriate, approximate 

 to the keel, elliptical or oblong, not linear, amber colored: flowers about 

 16: corollas 7 mm. long, at anthesis about equalling the sordid pappus; 

 the slender proper tube about twice the length of the throat : achenes 

 slender, dull black, upwardly hispid, 7 to 8 mm. long. — Collected by 

 Dr. J. N. Rose at Guaymas, Sonora, Mexico, 5 to 11 June, 1897, 

 no. 1272. Near P. ohlus>'foUum, DC, which, however, has more acute 

 dark purple involucral scales marked with dark linear glands. 



LiABUM Pkinglei, Rob. & Greenm. Proc. Am. Acad, xxxii. 49 

 (1896j. The type specimen of this species published by clerical error 

 as no. 6215 is 6214 of Pringle's Plantae Mexicanae. 



Perezia Nelsonii. Tufted with rusty wool at the slightly decum- 

 bent base ; stem soon erect (probably 1 m. tall), subterete, striate, 

 branched, leafy about to the middle, glabrous and smooth, purplish: 

 leaves large (1.7 dm. long, 6 to 8 cm. broad), firm, reticulated, oblong- 

 oblanceolate, rounded, obtuse or acute at the apex, cordate-clasping at 

 the base, sharply dentate with small spreading teeth : branches ascending, 

 nearly naked : heads few, large, many-flowered, 2.5 to 3 cm. long and 

 broad; pedicels 2 to 5 cm. long, bearing several small lanceolate attenu- 

 ate appressed scale-like bracts passing gradually into the broader ovate 

 to obloufj or at length lance-oblono[ involucral scales, these s'^en with a 

 slight purple tinge, ciliolate, imbricated in about 7 rows, the middle and 

 inner ones obtuse or rounded and mucronate at the tips, the outer acute, 

 slightly spreading and pungent: purple strongly bilabiate corolla 1.5 cm. 

 long: columnar granulated achene 4 mm. long. — Collected by E, W. 

 Nelson on mountains near Talpa, Jalisco, Mexico, altitude 1,400 to 

 1,500 m., 7 March, 1897, no. 4037. A species near P. michoacana 

 and P. cuernavacana, but clearly distinct from either. 



