466 PROCEEDINGS OF THE AMERICAN ACADEMY. 
M. Dombeyanum, DC. 1. c. 521, is a still doubtful species from Peru. 
M. Hildalgoa, DC. 1. ¢. = Hildalgoa ternata, Lav. & Lex. 
M. hirsutum, Benth. & Hook. f. 1. c. acc. to Hook. f. & Jacks. 1. ¢ 
== M. camphoratum, Benth. & Hook. f. 
— M. humile, Sw. Prodr. Veg. Ind. Occ. 114 (1788) = Acanthospermum 
humile, DC. 
M. lanceolatum, DC. Prodr. v. 519 (1836) = M. diffusum, var. 
lanceolatum. 
M. Liebmannii, Sch. Bip. in Klatt, Leopoldina, xxiii, 89 (1887) = 
M. montanum, Benth. 
M. longifolium, Brouss. ex Willd. Enum. Hort. Berol. 934 (1809) = 
(?) M. longifolium, Cerv. 
M. maniilense, Less. Linnaea, vi. 155, t. 2 (1831) = M. diffusum, Cass. 
M. ovatifolium, Reichenb. Ic. Exot. t, 42 (1827) = M. paludosum, 
HBK 
M. panamense, Klatt, 1. c. 42 = M. paludosum, HBK. 
M. pumilum, Benth, Pl. Hartw. 64 (1840) = starved WZ. paludosum, 
HBK. 
— M. ramosissimum, DC. Prodr. v. 518 (1836) = M. einereum, val. 
ramosissimum, Gray. 
M. rhomboideum, DC. 1. ¢. 520 (1836) = M. longifolium, Cerv- 
M. ruderale, Sw. Fl). Ind. Oce. iii. 1872 (1806) = Eleutheranthera 
ovata, Poit., acc. to Hook. f. & Jacks. 1. c. . 
M. sericeum, Benth. in Oerst. Vidensk. Meddel. 1852, p. 86, not 
Lag. = M. linearilobum, DC. 887) 
M. sericeum, var. brevipes, Gray, Proc. Am. Acad. xxii. 423 (1 
= typical M. sericeum, Lag. 
M. sericeum, var. longipes, Gray, Proc. Am. Acad. xxii, 423 (1887) 
= MM. longipes, Robinson. = co 
M. ternatum, DC. acc. to Hook. f. & Jacks. Ind. Kew. ii. 188, = 
Hidalgoa ternata, Liav. & Lex. ~ the 
It must be frankly confessed that among the species here kept up 
following are to the writer still doubtful : — “ 
M. americanum, L., which, although the type of the genus, cannot 
matched by any specimen from near the original station. ae 
M. microcephalum, Less. Not as yet satisfactorily represented in 
herbaria examined. 
M. paludicola, Taub., the description of which suggests a Sclerocarpus- 
M. paniculatum, Gardn., which from description is not clearly sepa 
rable from IM. oblongifolium, DC. 
