278 FIELD COLUMBIAN MUSEUM BOTANY, VOL. II. 



beneath; lobes oblong, mucronate, acute, entire or few-toothed; 

 the uppermost leaves reduced and laciniate-dentate to entire: 

 inflorescence a terminal comparatively few-headed panicle; the 

 branches usually bearing 3 heads: heads about 1.5 cm. high, 

 radiate: involucre campanulate, conspicuously calyculate with 

 linear-lanceolate green bracteoles; involucral bracts proper, 

 lanceolate to lance-oblong, 10 to 12 mm. long obtuse, scarious- 

 margined and, as well as the bracteoles, black-tipped and hirsute- 

 pubescent with spreading jointed hairs: ray-flowers 8 to 10; rays 

 yellow, elliptic-oblong, 10 to 12 mm. long, 4-nerved, the two 

 middle nerves often branching into 3 divisions: disk-flowers 

 about 50: achenes canescent-pubescent. Monogr. Senecio, I Th. 

 25 (1901) & in Engl. Bot. Jahrb. xxxii. 21 (1902), without com- 

 plete characterization. MEXICO. State of Chmuahua: Mt. 

 Mohinora, i September, 1898, E. W. Nelson, no. 4881 (hb. Gray, 

 and hb. U. S. Nat. Mus.). 



Senecio ( Amplectentes) platypus Greenman, sp. nov. 



An herbaceous perennial: stem simple or branched, striate, 

 purplish, lightly floccose-tomentulose: leaves petiolate, ovate 

 to ovate-lanceolate, 3 to 9 cm. long including the petiole, i to 

 4 cm. broad, mucronate-acute, entire to irregularly dentate, 

 cuneate to subcordate at the base, floccose-tomentulose above, 

 densely and permanently white tomentose beneath, thin and 

 membranous; petioles 4 cm. or less in length, usually expanded 

 and clasping the stem by an auriculate-stipuliform base: inflo- 

 rescence a terminal few-headed tomentulose subcorymbose cyme; 

 bracts linear-setaceous: heads 10 to 12 mm. high, radiate: 

 involucre narrowly campanulate, calyculate with minute setace- 

 ous bracteoles; bracts of the involucre usually 21, lance-linear, 

 6 to 8 mm. long, glabrous except at the base, black-tipped: ray- 

 flowers about 13; rays yellow: disk-flowers 40 to 45: achenes 

 densely sericeous-hirtellous. MEXICO. State of Nuevo Leon: 

 Sierra Madre near Monterey, 21 December, 1906, C. G. Pringle, 

 no. 10,352 (hb. Gray), type; on limestone ledges near Monterey, 

 12 March, 1906, C. G. Pringle, no. 13,882 (hb. Gray). The 

 conspicuous stipular-like development at the base of the petioles 

 renders this species easily recognizable, and quite distinct from 

 any other species known to the writer. 



Senecio ( Mulgedifolii) Cpnzattii Greenm. 



An herbaceous perennial: stem erect, simple or branched 

 above, about i m. high, striate, subangulate, at first arachnoid- 

 tomentulose, more or less glabrate: leaves oblong-lanceolate to 

 lance-attenuate, 0.5 to 3 dm. long, 0.5 to 5 cm. broad, acute, 

 glabrous or sparingly arachnoid above, permanently arachnoid- 

 tomentose beneath over a green to more or less purple leaf-sur- 

 face, dentate to merely callous-denticulate; the lowermost 

 leaves gradually narrowed below the middle into a winged 

 petiolar base, coarsely dentate to lyrately subpinnatifid ; the 

 upper leaves sessile and amplexicaul, becoming reduced towards 



