Abstract Detail

Anatomy and Morphology

Williams, Doressa [1], Ryan, Gillian [2], Ruane, Lauren [3], Cohen, Jim [4].

Comparative floral morphology of Phlox hirsuta and Phlox speciosa.

The Yreka Phlox, Phlox hirsuta, is a threatened species known from five populations around Yreka, CA, and the species grows on serpentine soil.  While P. hirsuta has a very restricted geographic range, it co-occurs with a widespread congeneric species, P. speciosa. Both species bear salverform corollas, are primarily allogamous, and are pollinated by species of Diptera and Lepidoptera; furthermore, the two species may be able to interbreed.  In order to gain insight into the potential for gene flow between the two species, floral morphology was examined for individuals of both species in populations in which they co-occur.  Flowers of both species from three populations were dissected, and the heights and lengths of various aspects of the corolla, androecium, and gynoecium were measured and subsequently compared using the Kruskal-Wallis test and principal components analysis (PCA).  Both species exhibit reverse herkogamy and have their five anthers attached at three different points along the corolla tube.  While most floral features vary between species, anther and filament lengths were similar. Anther height of P. speciosa overlaps with stigma height of P. hirsuta, but this is not the case for anther height of P. hirsuta and stigma height of P. speciosa, suggesting that gene flow between species, if it were to occur, would be unidirectional, from P. speciosa to P. hirsuta.

1 - The University of Southern Mississippi, 118 College Drive #7269, Hattiesburg, MS, 39406
2 - Kettering University, Department of Physics, 1700 University Ave., Flint, MI, 48504
3 - Christopher Newport University, Organismal And Environmntal Biology, 1 Avenue Of The Arts, Newport News, VA, 23606, United States
4 - Kettering University, 1700 University Ave., Flint, MI, 48503.0, United States

Flower morphology

Presentation Type: Poster
Number: PAM009
Abstract ID:472
Candidate for Awards:None

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