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Germination dimorphism and developmental flexibility in the ruderal weed Heterotheca grandiflora

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Summary

Heterotheca grandiflora Nutt. (Asteraceae, tribe Astereae) is one of the few native Californian plant species increasing its range as a weed. The production of dimorphic seed, together with flexible development in either the annual or biennial habit, may contribute to its range expansion. Well dispersed disc achenes germinate rapidly to high percentages while poorly dispersed ray achenes show considerable dormancy, germinating at a much lower rate to lower final percentages. Ray achenes appear more sensitive to environmental factors and have more specific germination requirements than do disc achenes. Thus, germination is distributed in space and time. Plants growing as annuals have one flowering period while those acting as biennials may flower up to three times, although seed production differs greatly among the stages. These factors aid in forming the “general purpose genotype” so frequently encountered in weedy species.

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Authors and Affiliations

  1. Department of Biology, UMC 45, Utah State University, 84322, Logan, UT, USA

    Stephan D. Flint & Ivan G. Palmblad

  2. the Ecology Center, UMC 45, Utah State University, 84322, Logan, UT, USA

    Stephan D. Flint & Ivan G. Palmblad

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  1. Stephan D. Flint
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  2. Ivan G. Palmblad
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Flint, S.D., Palmblad, I.G. Germination dimorphism and developmental flexibility in the ruderal weed Heterotheca grandiflora . Oecologia 36, 33–43 (1978). https://doi.org/10.1007/BF00344569

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  • DOI: https://doi.org/10.1007/BF00344569

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