Mark C. Tebbitt

Two new yellow-flowered tuberous species of Begonia (Begoniaceae) from Bolivia

Begonia germaineana and Begonia chrysantha, members of Begonia section Eupetalum, are described and illustrated as new species endemic to Bolivia. A key is provided to these and other yellow-flowered Begonia species from South America.ResumenBegonia germaineana y Begonia chrysantha, miembros de Begonia sección Eupetalum, se describen e ilustran como nuevas especies endémicas de Bolivia. Se proporciona una clave para estas y otras especies de Begonia con flores amarillas de América del Sur.

Begonia hahiepiana, a New Species of Begonia Section Sphenanthera (Begoniaceae) from Vietnam

ABSTRACT Begonia hahiepiana H. Q. Nguyen & Tebbitt (Begoniaceae; section Sphenanthera (Hasskarl) Warburg), a new species from Phu Tho Province, Vietnam, is described and illustrated. This new species is most readily distinguished from the closely related B. balansana Gagnepain and B. ceratocarpa S. H. Huang & Y. M. Shui by its upper leaf surfaces, which are an iridescent dark blue (rather than glossy green) and have deeply sunken veins giving them a puckered appearance (rather than smooth), by its outer pair of tepals having a covering of red trichomes on their outer surfaces (rather than appearing glabrous throughout), and by its fruits, which are spherical with three thickened rib-like wings (rather than being either rhomboidal with three horned appendages or star shaped with six, or sometimes five or seven, fleshy wedge-shaped points). Fieldwork indicates that the new species has a restricted distribution and a total population of less than 1000 individuals; it is recommended to be placed in the IUCN category VU D 1, 2.

A New Species of Begonia Sect. Gobenia (Begoniaceae) from Colombia and Ecuador

Abstract. Begonia callistemon Tebbitt & P. R. Stevenson, a new species of Begonia L. sect. Gobenia A. DC. (Begoniaceae) from Colombia and Ecuador, is described and illustrated. Begonia callistemon is compared with B. hitchcockii Irmsch., the only other species within section Gobenia that shares a large, showy androecium resembling the head of a bottle brush. Begonia callistemon is distinguished from this species by its basifixed leaf blades; pubescent stems, peduncles, and pedicels; narrower outer tepals in staminate flowers; fewer stamens; and pistillate flowers with five tepals.

A New Tuberous Begonia Species (Begoniaceae) from Bolivia

Abstract. Begonia phantasma Tebbitt from the Begonia L. sect. Eupetalum (Lindl.) A. DC. (Begoniaceae) is described and illustrated as a new species endemic to Bolivia. Begonia phantasma is compared with the similar species B. clarkei Hook. f. and B. krystofii Halda, both of which are also found in Andean Bolivia. Begonia phantasma is distinguished from both of these two species by its leaf blades that are ovate with an acute apex, by its bracts that are greenish yellow and cup-shaped and surround the lower portion of the fully expanded flower buds, by its tepals that in bud and immature flowers are greenish yellow and in anthesal flowers that are cream or cream with a pink tinge, and by its oval androecial outline.

A new species and a new synonym of Begonia from Bolivia

Begonia cremnophila is described and illustrated as a new species. It is compared with B. weddelliana, and a description of that species is also provided. Begonia davisii is typified and newly synonymized with B. weddelliana.ResumenSe describe e ilustra una nueva especie, Begonia cremnophila. Es semejante a B. weddelliana del norte de Bolivia, que también se encuentra sobre barrancas y acantilados sombreados y en bosque húmedo tropical en las estribaciones orientales de los Andes. Begonia davisii es recién synonimizada con B. weddelliana.