466 PROCEEDINGS OF THE AMERICAN ACADEMY. 



^^. Dotnbeyanum, DC. 1. c. 521, is a still doubtful species from Peru. 



M. Hiklalgoa, DC. 1. c. = llildalgoa tcrnata, Llav. & Lex. 



31. hirsutum, Benth. & Hook. f. I. c. ace. to Hook. f. & Jacks. 1. c. 

 := M. camphoratum, Benth. & Hook. f. 



.1/. humile, Sw. Prodr. Veg. Ind. Occ. 114 (17 '8S) = Acanthosper mum 

 fiumile, DC. 



M. lanceolatum, DC. Prodr. v. 519 (183G) = 31. diffusum, var. 

 lanceolatum. 



3f. Liebmannii. Sch. Bip. iu Klatt, Leopoldiua, xxiii. 89 (1887) = 

 31. montanum, Benth. 



31. longifolium, Brouss. ex AVilld. Euuni. Hort. Berol. 934 (1809) = 

 (? i M. longifolium, Cerv. 



31. manillense, Less. Liunaea, vi. 155, t. 2 (1831) = M. diffusum, Cass. 



.1/. ovatifolium, Reichenb. Ic. Exot. t. 42 (1827) = M. paludosum, 

 UV,K. 



31. /in immense, Klatt, 1. c. 42 = M. paludosum, HBK. 



M. pumilum, Benth. PL Ilartw. G4 (1840) = starved 31. paludosum, 

 HBK. 



3L ra?7wsissimum, DC. Prodr. v. 518 (183G) = M. cinereum, var. 

 ramosissim urn, Gray. 



M. rhomboideum, DC. 1. c. 520 (1836) = M. longifolium, Cerv. 



M. ruderale, Sw. Fl. Ind. Occ. iii. 1372 (1806) = Eleutheranthera 

 ovata, Poit., ace. to Hook. f. & Jacks. 1. c. 



M. sericeum, Benth. in Oerst. Videusk. Meddel. 1852, p. 86, not 

 Lai. r . = M. linearilobum, DC. 



M. sericeum, var. brevipes, Gra}', Proc. Am. Acad. xxii. 423 (1887) 

 = typical .)/. sericeum, Lag. 



M. sericeum, var. longipes, Gray, Proc. Am. Acad. xxii. 423 (1887) 

 = M. longipes, Robinson. 



.1/. ternatum, DC. ace. to Hook. f. & Jacks. Ind. Kew. ii. 188, = 

 Bidalgoa ternata, Llav. & Lex. 



It must be frankly confessed that among the species here kept up the 

 following are to the writer still doubtful: — 



M americanum, L., which, although the type of the genus, cannot be 

 matched by any BpecimeD from near the original station. 



.1/. microcephalum, Less. Not as yet satisfactorily represented in tho 

 herbaria examined. 



M. paludiro/</, Taub., the description of which suggests a Sclerocarpus, 



M. panicvlatum, Gardn., which from description is not clearly sepa- 

 rable from M. oblongifolium, DC. 



