ROBINSON. — SYNOPSIS OF THE GENUS MELAMPODIUM. 461 



•tH- Leaves of diverse forms, partly entire, partly cleft : Mexican. 



= Peduncles long : ra3's conspicuously exserted : sterile flowers numerous : pales 



yellow-tipped. 



15. M. HETEROPHYLLUM, Lag. Gcu. et Spec. Nov. 33 (181G) ; DC. 



I.e. — Tantoyuca, Huasteca, Berlandier, nos. 741, 2161, Ervendberg, 



no. 80; between San Luis Potosi and Tampico, Palmer, no. 1103 (coll. 



of 1879). 



= = Peduncles short or none : rays 3 to 4, minute : sterile flowers 1 to 3: pales 



purple-tipped. 



16. M. Pringlei. Root perpendicular, long, with fibrous branches, 

 probably annual ; stem copiously branched from the base ; the branches 

 terete, purple, hirsute : leaves chiefly undivided, narrowly elliptic-lan- 

 ceolate, 2 to 3 cm. long, 3 to 6 mm. broad, acutish, finely subappressed- 

 pubescent above, snowy-sericeous beneath : lower heads short-peduucled 

 from the forks, the upper subsessile, lateral and terminal, all small and 

 few-flowered ; outer bracts of the involucre 5, lance-linear and acute or 

 somewhat spatulate, 3.5 mm. long, so narrow as to disclose the young 

 fruit at an early stage in its development : ray-flowers 3 to 4 ; ligules 

 very small, oval or sub-orbicular, entire or slightly 2-toothed: pales pur- 

 ple tipped ; disk-flowers 1 to 3, mostly reduced to a clavate rudiment : 

 fruit of the ray-flowers obovoid, strongly tuberculate, destitute of hood, 

 cup, or appendage. — Collected by C. G. Pringle, at Las Sedas, Oaxaca, 

 altitude 1,850 m., 15 September, 1894, no. 5722. Type in herb. Gray. 



++ ++ Leaves all undivided, linear : South American. 



17. M. ANGUSTiFOLiUM, DC. 1. c. (1836). — Peru, Haenke. 



■*- -t- Leaves not sericeous beneath. 

 ++ Slightly lignescent perennial : Lower California. 



18. M. siNUATU.M, Brandegee, Proc. Calif. Acad. Sci, ser. 2, iii. 144 



(1891). — San Jose del Cabo, Brandegee, no. 302. 



•w- *+ Mexican and S. American species: annuals except M. montanum. 

 = Leaves cordate- or auriculate-clasping at the base. 



19. M. Rosei. Erect annual, 3 to 4 dm. high ; stem purplish, copi- 

 ously branched almost from the base, covered with short white retrorse 

 hairs : leaves oblong-lanceolate, attenuate, sinuately toothed, slightly 

 narrowed to auriculate-clasping somewhat connate bases, sparsely pubes- 

 cent upon both surfaces, scabrous on the margin, scarcely paler beneath, 

 the larger about 7 cm. long, 2.5 cm. broad : peduncles in the forks of the 

 stem, 7 cm. long, filiform, retrorsely pubescent ; outer involucre 5-parted, 

 the divisions broadly ovate or suborbicular, rounded or barely pointed at 

 the apex, pubescent upon the back : ray -flowers 8 to 10, ligules oblong, 



