| Abstract Detail
Systematics Section / ASPT Jensen, Angela B. [1], Lindquist, Sarah O. [2], Pozner, Raul [3], Johnson, Leigh A. [4]. Calyx and Trichome Morphology in Navarretia (Polemoniaceae). Navarretia circumscribes approximately 35 annual species distributed primarily in Western North America. Small in stature and flower, and usually bearing spinescent leaves, Navarretia species are distinguished by various character combinations that include habit, bract morphology, calyx morphology, flower morphology and coloration, carpel number, and stamen position. Two of four recognized sections are well supported by both morphological and DNA sequence data, while the remaining two sections, and several unplaced species formerly belonging to the genus Gilia, are non-monophyletic. To further understand relationships and patterns of species diversification and character evolution within Navarretia, we surveyed calyx morphology with an emphasis on trichome diversity and distribution from representative populations of all but two taxa, including subspecies. To aid in this study, we defined regions of homology including inner calyx tube, outer calyx tube, inner lobe, and outer lobe, and further considered aspects of calyx lobe morphology including size, shape, and the contribution of foliar base and blade on lobe structure. Our survey shows that, unlike the relatively uniform trichomes in closely related Allophyllum, Navarretia possesses a tremendous diversity in both glandular and eglandular trichomes. In some cases, trichome diversity is congruent with patterns of relationships suggested by independent data, while in other cases the converse is true.
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1 - Brigham Young University, Integrative Biology, 401 Widstoe Building, Provo, Utah, 84602, USA
2 - Brigham Young University, Integrative Biology, 401 Widtsoe Building, Provo, Utah, 84602, USA
3 - Instituto De Botánica Darwinion, Casilla De Correo 22, San Isidro, Buenos Aires, B1642HYD, Argentina
4 - Brigham Young University, Department of Integrative Biology, 401 Widtsoe Building, Provo, Utah, 84602, USA
Keywords:
systematics
comparative morphology
character evolution
cladistics
taxonomy
Polemoniaceae.
Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P59053
Abstract ID:1905 |
