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(American Journal of Botany. 2005;92:797-801.)
© 2005 Botanical Society of America, Inc.

Anatomy and Morphology

Floral venation patterns in Siphocampylus (Campanulaceae)1

Wlademir Saburi, Jr.2, Lucelaine Rocha Reato3 and Silvana Aparecida Pires de Godoy4,,5

Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Biologia, Universidade de São Paulo, Avenida Bandeirantes 3900, Ribeirão Preto 14040-901, São Paulo, Brazil

ABSTRACT

Siphocampylus is a neotropical genus that comprises 221 species distributed from Costa Rica to Argentina and in the Greater Antilles. Twenty-eight species have been reported from Brazil, mainly occupying mountainous terrain. The floral venation patterns and the origin of the hypanthium in eight Brazilian species, including three varieties, are described. Eleven ovarian vascular bundles depart from the siphonostele or receptacular stele: five of these bundles result from sepalar and staminal adnation and are alternate to five petalar bundles; the remaining bundle is central carpellary. The staminal bundles diverge from the sepalar bundles at the sinus, while the carpellary bundles form a cross, resulting in four ventral bundles; two of these feed the ovules; the other two feed the style. Apparently, the dorsal carpellary bundles diverge at the same site and then ramify profusely. The venation pattern observed is unprecedented in Siphocampylus and is quite different from other reports on genera of Campanulaceae. Further, these findings suggest that the origin of the hypanthium is appendicular, increasing knowledge of venation in this group, thus providing data for phylogenetic considerations.

Key Words: appendicular hypanthium • Campanulaceae • flower venation patterns • inferior ovary • Siphocampylus






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