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Article << Previous     |     Next >>   Contents Vol 25(3)

Raciation in Epacris impressa. II. Habitat differences and flowering times

HM Stace and YJ Fripp

Australian Journal of Botany 25(3) 315 - 323
Published: 1977

Abstract

The various races of E. impressa occupy different habitats. In east Gippsland, the Otways and the Western District of Victoria, the white-flowered race is found in open sunny sites, whereas the pink-flowered race occurs in more shaded situations. These contrasting habitats-sunny and shaded -frequently form an interlocking distribution mosaic. In these areas the white-flowered race is distinctively spring-flowering whilst the pink-flowered race is winter-flowering. The scarlet-flowered race found at Wilson's Promontory on the granitic mountains has a flowering season from approximately April to November.

The field data presented here strongly suggest that flowering time is a variable which has become modified in regions of sympatry to give a large measure of reproductive isolation between the pink and white-flowered races. In one area of allopatry-the Little Desert-only the white-flowered race occurs where it is winter-flowering.



Full text doi:10.1071/BT9770315

© CSIRO 1977

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