Systematics/Phytogeography / Taxonomie/ Section
Peters, Rebecca .
A Treatment of Violaceae for the Flora of Chiapas.
Chiapas, the southernmost state of Mexico, has land elevations ranging from sea level to 4000 m and annual rainfall varying regionally from less than 75 cm to more than 500 cm. In his introduction to the Flora of Chiapas, Breedlove described 19 vegetational formations distributed over seven physiographic regions in the state. Violaceae (the violet family) worldwide include 18--25 genera with 850--900 species. The three largest genera (highest numbers of species) are found in Chiapas: Viola (525--600 species worldwide) with 5 species in Chiapas, 3 native and 2 introduced; Rinorea, a pantropical genus (ca. 200 species worldwide) with 2 species in Chiapas, and Hybanthus (100--125 species worldwide) with 10 species in Chiapas, including one that is endemic. The remaining two genera of Violaceae in Chiapas have distributions limited to southern Mexico, Central America, and northern South America with few species per genus: Orthion with 6 species (3 in Chiapas), and Corynostylis with 4 species (1 in Chiapas). Most species of Violaceae occur in tropical or subtropical regions worldwide. In Chiapas, Violaceae are reported from six of the seven physiographic regions recognized as present in Chiapas and from a dozen vegetational formations. They are found near sea level through elevations of 3600 m. Members of Violaceae, both within the family and within Chiapas, range from small herbs to tall trees. They bear actinomorphic corollas (species of Rinorea) to strongly zygomorphic corollas (Corynostylis and Viola). The violet family, the five genera, and each species native to or naturalized in Chiapas are described, using morphological features; species and genera distributions over the physiogeographic regions and within vegetative formations are noted.
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1 - California Academy of Sciences, Botany, 875 Howard St., San Francisco, CA, 94103, USA
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM