ROBINSON. —- SYNOPSIS OF THE GENUS MELAMPODIUM. 463 
man. It is evidently close to M. paludosum in habit and foliage, differ- 
ing chiefly, as Lessing himself notes, in its obliquely acuminate instead 
of rounded or obtuse involucral bracts. 
c. Divisions of the outer involucre obovate, rounded or obtuse. 
1. Decumbent perennial with elliptical discolorous leaves and pale yellow rays 
(often tinged with purple). 
25. M. montanum, Benth. Pl. Hartw. 64 (1840). I. Liebman- 
nt, Sch. Bip. in Klatt, Leopoldina, xxiii. 89 (1887). — Oaxaca, Graham, 
_ Pringle, no. 4666; Chiapas, Ghiesbreght, nos. 174, 564; San Luis Potosi, 
Pringle, no. 3818; Cumbre de Estepa and Yavesia, Liebmann, no, 232. 
2. Erect annuals. 
26. M. tTeneLLum, Hook. & Arn. Bot. Beech. 299 (1840). — Aca- 
WV pulco, Sinclair. 
27, M. cupuLatum,’ Gray, Proc. Am. Acad. viii. 291 (1870). — 
Sonora, Palmer, no. 20; Mazatlan, W. G. Wright, no. 1218; Alamos, 
Palmer, no. 726 (coll. of 1890). This species may possibly prove iden- 
tical with the preceding. Both are distinguished from the following by 
their narrow lance-linear or oblong-linear leaves. 
28. M. patuposum, HBK. Nov. Gen. & Spec. iv. 273 (1820). UM. 
divaricatum, DC. Prodr. v. 520 (1836). MM. pumilum, Benth. Pl. Hartw. 
64 (1840), described from starved specimens. Jf. copiosum and ©. 
panamense, Klatt in Engl. Jahrb. viii. 41, 42 (1887), founded upon tri- 
fling foliar variations without accompanying floral distinctions. Dyso- 
dium divaricatum, Rich. in Pers. Syn. ii. 489 (1807). D. radiatum, 
Desf. Cat. Hort. Paris, 1829, p. 182. Alcina ovalifolia, Lag. “ Elench. © 
Hort. Madr. 1805,” Gen. et Spec. Nov. 32 (1816). A. ovatifolia, Jacq. 
f. Eclog. i. 115, t. 78 (1815?). A. minor, Cass. Dict. lix. 243. 
Wedelia ovatifolia, Willd. Suppl. 61 (1813). W. minor, Hornem. Hort. 
Hafn. 855 (1813).— A common weed throughout Mexico, Central 
America, and also occurring in the West Indies. Highly variable in leaf 
contour, length of ligules, etc., thus passing into many very diverse yet 
seemingly unstable forms. 
* * Rays short, inconspicuous, exceeded by the involucre : peduncles short or none. 
+ Leaves ovate-lanceolate, rounded at the subsessile base: Panama to Brazil. 
/ 29. M. campnoratum [Benth. & Hook. f. Gen. ii. 349 cst) 
(Baker in Mart. F1. Bras. vi. pt. 3, 161 (1884). M. digynum, Benth. 
Hook. f. 1. ¢. ace. to Hook. f. & Jacks. Ind. Kew. ii. 188. Unzia cam- 
phorata, L. f. Suppl. 868 (1781). U. digyna, Steetz in Seem. Bot. 
Herald, 154, t. 30 (1852-1857). — Panama, Seemann, and Llanos de 
