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. obtusifolium, DC., which, however, has more acute 
dark purple involucral scales marked with dark linear glands. 
Liasum Prinexer, Rob. & Greenm. Proc. Am. Acad, xxxii. 49 
(1896). 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 oblong or at length lance-oblong involucral scales, these green 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. Ww. 
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. 
