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Abstract Detail

Systematics Section / ASPT

McDade, Lucinda A. [1], Kiel, Carrie A. [2], Daniel, Thomas F. [3].

Justicieae revisited: Increased taxon sampling and characters support a new lineage and more "justicioid" Diclipterinae.

Justicieae comprise >2000 species and are by far the largest lineage of Acanthaceae; the genus Justicia alone includes ca. 700 species. Our earlier work indicated that Justicieae are monophyletic and composed of at least five clades and one grade related as follows: [Pseuderanthemum lineage (Isoglossinae {Tetramerium lineage [multiple clades of Old World “justicioids” (Diclipterinae + New World “justicioids”)]})]. For the present study, we have increased taxon sampling to include representatives of almost all genera known or suspected to be Justicieae and also added three genic regions of sequence data to our core of nrITS + cp trnL-F. Our results confirm monophyly of (1) New World (NW) “justicioids” including plants representing all recognized subgeneric taxa of NW Justicia, as well as all other NW genera that share the synapomorphies of “justicioids” (e.g., a rugula or channel-like structure on the internal surface of the upper lip formed by parallel ridges of corolla tissue), (2) the Tetramerium Lineage, and (3) Isoglossinae. Diclipterinae are expanded considerably to include members of at least six genera of Old World (OW) “justicioids” plus several species of OW Justicia. The remaining OW “justicioids” are a grade of at least three lineages that are sequentially basal to NW “justicioids” + Diclipterinae. The present results support the pattern of relationships among lineages presented above with the addition of a new lineage of Asian Justicieae that is either sister or basal to Isoglossinae and includes Ptyssiglottis and at least three other genera. Finally, our results indicate that there are at least two distinct clades of the Pseuderanthemum lineage, each of which includes both NW and OW taxa. Our phylogenetic results have notable consequences for taxonomy especially regarding the large genus Justicia which is massively non-monophyletic, and also provide context for examining biogeography and character evolution across this species-rich and biologically disparate clade.

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Related Links:
McDade Home Page
Acanthaceae Tree of Life

1 - Rancho Santa Ana Botanic Garden, 1500 N. College Ave., Rancho Santa Ana Botanic Garden, Claremont, CA, 91711, United States
2 - Academy of Natural Sciences, Department of Botany, 1900 Benjamin Franklin Parkway, Philadelphia, Pennsylvania, 19103, USA
3 - California Academy of Sciences, Department of Botany, 875 Howard Street, San Francisco, California, 94103-3009, USA

DNA sequence data.

Presentation Type: Oral Paper:Papers for Sections
Session: CP29
Location: Stevens 2/Hilton
Date: Tuesday, July 10th, 2007
Time: 8:45 AM
Number: CP29002
Abstract ID:1932

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