disk flower


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disk flower

[′disk ‚flau̇·ər]
(botany)
One of the flowers on the disk of a composite plant.
References in periodicals archive ?
Seed/Ovule ratio: To determine the S/O rate in the collected 25 capitulum, the mean number of disk flowers and filled achenes per capitulum were reported as 33.1 and 11.7, respectively.
When the stigmas of the outer ring of disk flowers in each head were receptive, we began geitonogamy pollinations by gently transferring pollen to stigmas with toothpicks.
The number of disk flowers per cross-pollination head (see methods under Flower visitation and pollen limitation below) was the measure of plant size (Wagenius, 2004).
However, the cross-pollinated heads had only 67% the number of disk flowers as open-pollinated heads.
Carefully selected plots with equal proportions of red disk and yellow disk flowers were used.
Finally, when offered a choice between an unmodified yellow disk aster and a sucrose enriched red disk aster, pollinators still preferred yellow disk flowers (Table 4).
The fact that the yellow disk asters offer significantly more viable pollen and are visited more often, if not exclusively, by insect pollinators than red disk asters begs the question of why old, inviable, red disk flowers are retained.
Its ray flowers are yellow and wedge-shaped, while the central disk flowers forms a greenish-yellow, ball-like structure.