Abstract Detail

Developmental and Structural Section

Svoboda, Harlan [1], Ballard, Harvey [2].

Preliminary Micromorphological Investigations Toward a Systematic Revison of Passiflora L. Sect. Dysosmia DC.

A Section of passionflowers (Passiflora L.) called Dysosmia DC. was introduced by de Candolle in 1822 with a suite of characteristics unique to family Passifloraceae. This group has been revised at least eight times in the past 192 years with the most current evaluation of taxa within Dysosmia recognizing 21 species, some ill-defined or apparently highly polymorphic, and at least three broadly defined species complexes. Many of the section's micromorphological features have largely been ignored, but recent observations suggest that these neglected traits may be better indicators of relationship and have great taxonomic utility for delineating species complexes. An intensive and comparative morphological and anatomical analysis has been initiated to interpret the boundaries and affinities of Sect. Dysosmia and delimit species complexes and sublineages in it. Preliminary studies indicate that morphology, abundance, and position of glandular trichomes or glands, as well as the degree of dissection in the stipules and involucral bracts, may present a new suite of features for species distinctions, circumscriptions and affinities. These under-studied traits suggest a number of putative evolutionarily natural aggregations of species into complexes or groups to facilitate further intensive study and help assure even taxonomic sampling for subsequent phylogenetic analyses. Interpreting the relationship between morphology and evolutionary history will lead to a more complete understanding of the diversity and taxon composition in Sect. Dysosmia and its place within Passiflora.

1 - Ohio University, Environmental & Plant Biology, 315 Porter Hall, Athens, OH, 45701, USA
2 - Ohio University, ENVIR & PLANT BIOLOGY-PORTER H, 315 Porter Hall, Athens, OH, 45701-2979, USA

Keywords:
Passiflora
Dysosmia
passionflowers
Morphology
systematics.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PDS009
Abstract ID:218
Candidate for Awards:Katherine Esau Award,Developmental and Structural Section best poster