Journal of Plant Research

, Volume 109, Issue 1, pp 7–19

Floral morphology and phylogenetic analysis inCrossostylis (Rhizophoraceae)


  • Hiroaki Setoguchi
    • Department of Botany, University MuseumThe University of Tokyo
    • Makino Herbarium, Faculty of ScienceTokyo Metropolitan University
  • Hideaki Ohba
    • Department of Botany, University MuseumThe University of Tokyo
  • Hiroshi Tobe
    • Department of Environmental Sciences, Faculty of Integrated Human StudiesKyoto University
Original Articles

DOI: 10.1007/BF02344282

Cite this article as:
Setoguchi, H., Ohba, H. & Tobe, H. J. Plant Res. (1996) 109: 7. doi:10.1007/BF02344282


Floral morphology in all ten species ofCrossostylis, one of the inland genera of Rhizophoraceae and is distributed in the South Pacific Islands, was studied to increase our knowledge on floral features of individual species as well as on relationships among the species. Flowers ofCrossostylis, unlike those of the other Rhizophoraceae, always have semi-inferior ovaries and entire petals, but are diversified concerning the number and arrangement of stamens and carpels, the presence or absence of staminodia, sexuality and the structure of nectaries. Despite some doubt of the presence of apomorphies restricted to the whole genus, we tentatively definedCrossostylis by a combination of the presence of the semi-inferior ovary, entire petals, and arillate seeds, and then performed cladistic analysis on the basis of 24 floral and other morphological characters and withCarallia andGynotroches as outgroups. Our phylogenetic analysis suggested that the species ofCrossostylis are divided into two monophyletic groups: one comprising six species distributed in the Solomon Islands, Vanuatu and the Fiji Islands, and the other comprising four species distributed in New Caledonia and Polynesia.

Key words

Cladistic analysisCrossostylisFloral anatomyFloral morphologyRhizophoraceaeSouth Pacific

Copyright information

© The Botanical Society of Japan 1996