DEC. 1907. SPERMATOPHYTES FROM MEXICO GREENMAN. 277 



branched, glabrous below, slightly pubescent above, terminated 

 by a single large radiate head, or bearing in addition i to 3 re- 

 duced heads: leaves petiolate, ovate, 2 to 3 cm. long, two-thirds 

 as broad, obtuse, glabrous on both surfaces, subentire to spar- 

 ingly and obtusely dentate; the lower leaves on long petioles, 



2 to 4 times as long as the blade; the upper stem-leaves some- 

 what laciniate-dentate or sublyrate, not infrequently expanding 

 at the base and subamplexicaul : peduncles somewhat enlarged 

 above, pubescent: heads about 12 mm. high, including the rays 



3 to 3.5 cm. broad: involucre campanulate, essentially naked; 

 bracts of the involucre about 20, lanceolate-linear, 8 to 10 mm. 

 long, acute, green, scarious-margined, glabrous except at the 

 penicillate tip: ray-flowers 10 to 12; rays conspicuous, light 

 yellow: 'disk-flowers numerous: achenes glabrous. Monogr. 

 Senecio, I Th. 24 (1901) & in Engl. Bot. Jahrb. xxxii. 20 (1902), 

 without complete characterization. MEXICO. Territory of 

 Tepic: in the Sierra Madre, near Santa Teresa, 10 August, 1897, 

 Dr. J. N. Rose, no. 2,157 ( h b- Gray, and hb. U. S. Nat. Mus.). 



Senecio ( Amplectentes) heterodontus Greenman, sp. nov. 



An herbaceous perennial: roots fleshy-fibrous from a short 

 perpendicular root-stock: stem erect, simple or branched, 0.5 to 

 i m. high, nearly naked above, striate, glabrous to crisp-pubes- 

 cent: leaves lanceolate, i to 3 dm. long, i to 4 cm. broad, slightly 

 hirtellous-puberulent to essentially glabrous on the upper sur- 

 face, pubescent beneath; the lowermost leaves, obtuse or acute, 

 narrowed below, rather long winged-petiolate, unequally dentate 

 or dentate-lobed ; the upper stem-leaves, remote, sessile, amplexi- 

 caul, acuminate, more or less regularly denticulate, becoming 

 bract-like toward the inflorescence: heads numerous, 8 to 10 mm. 

 high, radiate, disposed in a terminal corymbose cyme: in- 

 volucre campanulate, calyculate, glabrous, or slightly pubescent 

 at the base: bracts of the involucre 13 (-21), lanceolate, 4.5 to 

 5.5 mm. long, acutish, terminated by a blackish penicillate tip: 

 ray-flowers commonly 8 ; tube pubescent ; pappus somewhat 

 exceeding the tube: disk-flowers 48 to 50: achenes striate, gla- 

 brous. 5. potosinus Greenm. Monogr. Senecio, I Th. 25 (1901) & 

 in Engl. Bot. Jahrb. xxxii. 21 (1902), without complete character- 

 ization, not 5. potosianus Klatt. MEXICO. State of San Luis 

 Potosi: Valley of San Luis Potosi, in mountains near San 

 Miguelita, September, 1876, Dr. J. G. Schaffner, no. 280 (hb. 

 Gray), type; in the region of San Luis Potosi, collection of 1878, 

 Parry & Palmer, no. 536 (hb. Gray); Alvarez, 13 to 23 July, 

 1904, Dr. E. Palmer, no. 237 (hb. Gray, and hb. Field Mus.). 

 This species may be found in herbaria under the name of "Senecio 

 multidentatus . " 



Senecio ( Amplectentes) mohinorensis Greenm. 



Stem erect, striate, puberulent: leaves sessile, amplexicaul, 

 pinnately lobed, lanceolate in general outline, 5 to 15 cm. long, 

 i to 4 cm. broad, puberulent. on both surfaces, slightly paler 



