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(American Journal of Botany. 2004;91:139-148.)
© 2004 Botanical Society of America, Inc.

Systematics

The phylogeny of Gaura (Onagraceae) based on ITS, ETS, and trnL-F sequence data1

Gloria D. Hoggard2,4, Paul J. Kores3, Mia Molvray2 and Ronald K. Hoggard2

2Department of Botany, University of Oklahoma, Norman, Oklahoma 73019-0245 USA; 3Department of Biological Sciences, Moorpark College, Moorpark, California 93021-1695 USA

Gaura (Onagraceae: Onagreae) is a small North American genus of 21 species consisting mostly of night-blooming, moth-pollinated annuals and perennials. The current infrageneric classification based on differences in habit, floral symmetry, and fruit morphology recognizes eight sections within the genus. We examine the phylogenetic relationships of all 21 species of Gaura using DNA sequence data from the internal transcribed spacer region (ITS), the external transcribed spacer region (ETS), and the plastid trnL-F region. Combined analysis of these regions indicate Gaura is monophyletic only if it includes Stenosiphon, a monotypic genus comprised of S. linifolius. Within Gaura, our studies indicate that sections Gauridium, Schizocarya, Campogaura, Stipogaura, Xenogaura, and Gaura are monophyletic, but sections Xerogaura and Pterogaura are not and should be reevaluated. In addition, molecular data provide support for the hypothesis that G. sinuata and G. drummondii arose via interspecific hybridization followed by genome doubling; their influence on phylogenetic reconstruction is discussed.

Key Words: ETS • Gaura • ITS • molecular systematics • Onagraceae • Stenosiphon • trnL-F






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