Kiel, Carrie , Mcdade, Lucinda , Daniel, Thomas .
Unraveling Relationships Among the Morphologically Diverse and Taxonomically Complex New World Justicioids.
The diverse justicioid lineage (ca. 1000 species) is part of the large, pantropical tribe Justicieae (Acanthaceae). Many justicioids share a number of morphological characteristics, notably, (1) the presence of a rugula: a channel-like structure formed by parallel ridges of corolla tissue that partially enclose the style, and (2) 'anther complexity' (i.e., expanded connective, reduced, highly modified, or sterile theca). Comprising the majority of this monophyletic lineage are members of Justicia from the Old World (OW) and New World (NW). Justicia is both species rich, particularly in the New World tropics, and taxonomically problematic. Our phylogenetic data show that Justicia is highly polyphyletic and contradict the most recent infra-generic classification. All NW Justicia and five smaller NW genera (collectively "NW justicioids") form a strongly supported clade, with significant resolution for major subclades but with moderate to low support for relationships among them. OW Justicia, however, is grossly paraphyletic. Interestingly, the species-rich Diclipterinae embedded within justicioids putatively have lost the morphological traits that mark justicioids and thus have not previously been associated with them. Here we present our recent phylogenetic work from nuclear PHOT1-2, nrITS and chloroplast trnS-G, trnT-L, rpS16, rpL16, trnL(uag)-ndhF, ndhA genes with a focus on the species rich NW justicioid lineage. In addition, we re-evaluate characters traditionally used in taxonomy classifications of Justicia in particular, pollen, androecium, and inflorescence characters, and discuss morphological evidence that support the hypothesized phylogenetic relationships among NW justicioids.
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1 - Rancho Santa Ana Botanic Garden, 1500 North College Ave., Claremont, CA, 91711, USA
2 - Rancho Santa Ana Botanic Garden, Department Of Botany, 1500 N. College Avenue, Claremont, CA, 91711, USA
3 - California Academy of Sciences, Department of Botany, 55 Music Concourse Drive, Golden Gate Park, San Francisco, CA, 94118, USA
New World Justicia.
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell B/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 2:30 PM