ROBINSON. — SYNOPSIS OF THE GENUS MELAMPODIUM. 461 
++ Leaves of diverse forms, partly entire, partly cleft : Mexican. 
= Peduncles long: rays conspicuously exserted: sterile flowers numerous: pales 
yel i : 
15. M. HETEROPHYLLUM, Lag. Gen. et Spec. Nov. 33 (1816); DC. 
l.c.— Tantoyuca, Huasteca, Rerlandier, nos. 741,-2161, Ervendberg, 
no. 80; between San Luis Potosi and Tampico, Palmer, no. 1103 (coll. 
of eee 
= 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 em. long, 3 to 6 mm. broad, acutish, finely subappressed- 
pubescent above, snowy-sericeous beneath: lower heads short-peduncled 
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. aneustirottum, DC. 1. ¢. (1836). — Peru, Haenke. 
+ + Leaves not sericeous beneath. 
++ Slightly lignescent perennial: Lower California, 
18. M. stnvarum, Brandegee, Proc. Calif. Acad. Sci. ser. 2, iii. 144 
(1891). — San José del Cabo, Brandegee, no. 302. 
++ ++ 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 em. 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, 
