|Authors: ||R. A. Criley, Philip E. Parvin, S. Lekawatana|
Flower buds of Leucospermum cordifolium ‘Vlam’ were sampled at 2 week intervals from 1 October 1988 through 9 January 1989, and the development of florets was studied in paraffin sections.
For the period of flower head development, heat units were accumulated from a base of 6°C, and solar radiation was also accumulated.
At a bud size of 7 mm, only involucral bracts were found, but floret development began in mid-October as the bud length reached 10 mm.
Floret development proceeded slowly through December and more rapidly in January until flower anthesis was attained in February.
Approximately ¼ of the heat units and 1/3 of the solar radiation units were accumulated during the last month of the 3–½ month development period.
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