The yellow-flowered species of Cuphea (Lythraceae), including three new taxa

Graham, S. A. (Department of Biological Sciences, Kent State University, Ke nt, OH 44242, U.S.A.) & T. B. Cavalcanti (Centro Nacional de Pesquisa de Re cursos Geneticos e Biotecnologia, SAIN Parque Rural, CP 02372, Brasilia 70. 849, DE Brazil). The yellow-flowered species of Cuphen (Lythraceae), includ ing three new taxa. Brittonia 51: 24-30. 1999.-Among the predominantly purp le- and red-flowered species of the genus Cuphea, only seven yellow floral tube and/or yellow-petaled members in three sections were known. We add her e two new species and one new variety. Cuphea congesta from Venezuela and C . splendida var. viridiflava from Bolivia are new to sect. Melvilla. Cuphea xanthopetala from Brazil is described in sect. Euandra and expands the pre sence of this feature to a fourth section of the genus. A key is provided t o all Cuphea with yellow floral tubes and/or yellow petals to expedite dete rminations when these exceptional character states are present.