TIMING OUTCOMES. “Late fusion occurs when the primordia appear as distinct early on but the individual organs eventually fuse during development, often at the base, leaving the tips of the primordia free (usually found in asterids). By contrast, early fusion occurs when the fused organs appear first as a ring meristem or fascicle on which individual organ primordia appear later (usually found in rosids); thus, the base of the organs are fused from inception.”
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