ROBINSON. — SYNOPSIS OP THE GENUS MELAMPODIUM. 463 



man. It is evidently close to 31. 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. PI. Hartw. 64 (1840). M. Liebman- 

 nii, 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. texellum, Hook. & Arn. Bot. Beech. 299 (1840). — Aca- 

 pulco, Sinclair. 



27. M. cupulatum, Gray, Proc. Am. Acad. viii. 291 (1870). — 

 Sonora, Palmer, no. 20 ; Mazatlan, W. G. Wright, no. 1213; 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. paludosum, HBK. Nov. Gen. & Spec. iv. 273 (1820). M. 

 divarication, DC. Prodr. v. 520 (1836). M. pumilum, Benth. PI. Hartw. 

 64 (1840), described from starved specimens. M. copiosum and M. 

 panamense, Klatt in Engl. Jahrb. viii. 41, 42 (1887), founded upon tri- 

 fling foliar variations without accompanying floral distinctions. Dyso- 

 dium divarication, Rich, in Pers. Syn. ii. 489 (1807). D. radiation, 

 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. Diet. lix. 243. 

 Wedelia ovatifolia, Willd. Suppl. 61 (1813). W. minor, Ilornem. 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, 

 -t- Leaves ovate-lanceolate, rounded at the subsessile base : Panama to Brazil. 



29. M. camphoratum [Benth. & Hook. f. Gen. ii. 349 (1873)], 

 Baker in Mart. Fl. Bras. vi. pt. 3, 161 (1884). M. digynum, Benth. & 

 Hook. f. 1. c. ace. to Hook. f. & Jacks. Ind. Kew. ii. 188. Unxia cam- 

 phorata, L. f. Suppl. 368 (1781). U. digyna, Steetz in Seem. Bot. 

 Herald, 154, t. 30 (1852-1857). — Panama, Seemann, and Llanos de 



