Plant Systematics and Evolution

, Volume 125, Issue 3, pp 139–154 | Cite as

Species diversity, ecology and evolution in a primitive Angiosperm genus:Hibbertia (Dilleniaceae)

  • G. Ledyard Stebbins
  • R. D. Hoogland


Among the approximately 130 species ofHibbertia found in Australia, there are tall shrubs, low or trailing shrubs and vines bearing a diversity of leaves as to shape and venation pattern. Flowers are solitary, in leafy cymes or in false spikes, and display various gradual and abrupt transitions from vegetative to reproductive appendages. In the androecium, stamen number is highly variable both between and within species. Some sections have radial symmetry, others bilateral symmetry of the androecium and gynoecium. Follicle number varies from 10 to 1. Basic chromosome numbers of n = 4, 5, 8, 9, 10, 12 and 13 have been found in various sections, and occasional higher numbers, up to n = 64, indicate the presence of polyploidy. Habitats vary from tropical savanna through rain forest margins, wet and dry sclerophyll forests, heaths, sphagnum swamps, and mallee scrub to desert margins. The principal center of diversity is southwestern Australia, less diverse centers are in southeastern and northern Australia. With respect to leaf size, structure and venation; floral symmetry; and chromosome numbers; the diversity found among the species ofHibbertia exceeds that found in all but a few genera of Angiosperms, and is greater than that in any other exclusively woody genus. Nevertheless, individual species are relatively constant with respect to both morphology and ecological preferences.

Key words

Angiospermae Dilleniaceae Hibbertia Intrageneric diversity ecological radiation growth forms flower morphology chromosome numbers evolution 


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  1. Berg, R. Y., 1958: Seed dispersal, morphology and phylogeny ofTrillium. Norske Vidensk. Akad. Oslo, Naturv. Klasse1, 1–36.Google Scholar
  2. —, 1975: Myrmecochorous plants in Australia and their dispersal by ants. Aus. J. Bot.23, 475–508.Google Scholar
  3. Bolkhovskikh, Z., Grif, V., Matzejeva, T., andZakharyeva, O., 1969: Chromosome Numbers of Flowering Plants. Leningrad: Acad. Sci. USSR, Komarov Bot. Inst.Google Scholar
  4. Darlington, C. D., andWylie, A. P., 1955: Chromosome Atlas of Flowering Plants. London: George Allen and Unwin.Google Scholar
  5. Davis, G. L., 1966: Systematic Embryology of the Angiosperms. New York: Wylie.Google Scholar
  6. Dickison, W. C., 1967: Comparative morphological studies inDilleniaceae, I. Wood Anatomy. J. Arnold Arb.48, 1–23.Google Scholar
  7. —, 1968: Comparative studies in theDilleniaceae, III. The carpels. J. Arnold Arb.49, 317–329.Google Scholar
  8. —, 1969: Comparative morphological studies inDilleniaceae, IV. Anatomy of the node and vascularization of the leaf. J. Arnold Arb.50, 384–400.Google Scholar
  9. Endress, P. H., 1973: Arils and aril-like structures in woodyRanales. New Phytol.72, 1159–1171.Google Scholar
  10. Hiepko, P., 1965: Das zentrifugale Androecium vonPaeonia. Ber. Dtsch. Bot. Ges.77, 427–435.Google Scholar
  11. Leins, P., 1964: Die frühe Blütenentwicklung vonHypericum hookerianum Wight etArn. undH. aegypticum L. Ber. Dtsch. Bot. Ges.77, 112–123.Google Scholar
  12. Rickett, H. W., 1944: The classification of inflorescences. Bot. Rev.10, 187–231.Google Scholar
  13. Robson, N. K. B., 1972: Evolutionary recall inHypericum (Guttiferae)? Bot. Soc. Edinburgh41, 365–383.Google Scholar
  14. Sastri, R. L. N., 1958: Floral morphology and embryology of someDilleniaceae. Bot. Notiser111, 495–511.Google Scholar
  15. Smith-White, S., 1948: A survey of chromosome numbers in theEpacridaceae. Proc. Linn. Soc. New South Wales73, 37–56.Google Scholar
  16. Stebbins, G. L., 1974: Flowering Plants: Evolution above the Species Level. Cambridge, Harvard: Belknap.Google Scholar
  17. Wilson, C. L., 1965: The floral anatomy of theDilleniaceae. I.Hibbertia Andr. Phytomorphology15, 248–274.Google Scholar
  18. —, 1973: Floral anatomy ofDilleniaceae, II. Genera other thanHibbertia. Phytomorphology23, 25–42.Google Scholar

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • G. Ledyard Stebbins
    • 1
  • R. D. Hoogland
    • 2
  1. 1.Department of GeneticsUniversity of CaliforniaDavisUSA
  2. 2.Research School of Biological SciencesAustralian National UniversityCanberraAustralia

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