Revision of the Neotropical Genus Callaeum (Malpighiaceae)

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Abstract
The monotypic genus Callaeum (Malpighiaceae) was proposed by J.K. Small in 1910 to accomodate an aberrant mascagnioid plant, Jubelina nicaraguensis Griseb. On the basis of flower, fruit, and leaf characters this genus is again recognized as distinct from Mascagnia, in which it was submerged by Niedenzu, and is augmented by the addition of most of the remaining members of Niedenzu''s Mascagnia subg. Plagiogynixa, to which Niedenzu assigned C. nicaraguense. This makes necessary the new combinations Callaeum antifebrile, [basonym Banisteria antifebrilis], C. macropterum [Hiraea macroptera], C. malpighioides [Stigmaphyllon malpighioides], C. psilophyllum [H. psilophylla] and C. septentrionale [H. septentrionalis]. In addition, C. chiapense is added by transfer from Stigmaphyllon, and three new species, Callaeum clavipetalum, C. coatum, and C. reticulatum, are described. Keys, descriptions, and citations of representative specimens are provided for the ten recognized species, and the segregation of this genus from Mascagnia is discussed.

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