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Abstract Detail

Systematics Section

Donnell, Aliya [1], Ballard Jr, Harvey [1], Cantino, Philip [1].

Callianthe: A new genus of Malvaceae.

The boundaries between the genera Bakeridesia and Abutilon have long been debated. Results from recent phylogenetic studies of the Internal Transcribed Spacer (ITS) in tribe Malveae strongly suggest that these two genera as currently delimited are not monophyletic. Species previously included in each genus form a well-supported clade that is phylogenetically removed from both Bakeridesia and Abutilon. The congruence of morphological and karyological distinctions with this molecular evidence provides compelling support for recognition of the clade as a new genus, to be called Callianthe. Thus far, 40 species have been placed in Callianthe, based on the ITS data (including a molecular synapomorphy of a 25-bp deletion in the ITS2) and/or morphological evidence, including four or more ovules per mericarp,serrate leaves (versus entire leaves in Bakeridesia), heavily veined petals, and large, showy flowers (versus smaller flowers in Abutilon). In addition, species of Callianthe share a base chromosome number of x = 8 (versus 7 in Abutilon and 15 in Bakeridesia). Not only is Callianthe phylogenetically removed from both Bakeridesia and Abutilon, but it is also morphologically distinct from its closest phylogenetic relative, Gaya, which has a base chromosomenumber of x = 6. Callianthe has a neotropical distribution with a center of diversity in eastern Brazil. It includes all of Bakeridesia subg. Dipteron and several species previously assigned to Abutilon.

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1 - Ohio University, ENVIRONMENTAL & PLANT BIOLOGY, Porter Hall, Richland Ave., Athens, OH, 45701-2979, USA

Neotropical plants
new genus.

Presentation Type: Oral Paper:Papers for Sections
Session: 29
Location: Lindell B/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 10:30 AM
Number: 29008
Abstract ID:677

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