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Stage 1
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Vegetative period
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SAM keeps the conical shape and is wrapped tightly by young leaves
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Stage 2
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Apical meristem enlargement stage
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Apical meristem grows and expands, showing hemispherical shape and developing into IM
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Stage 3
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Bract formation stage
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Bract primordia start to from at the basal part of IM
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Stage 4
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Disc floret primordia formation early stage
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Disc floret primordia showing as small spherical protrusions initiate at the lower part of IM
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Stage 5
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Ray floret primordia formation early stage
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Ray floret primordia showing as approximate elliptical protrusions initiate between the bract and the outermost disc floret primordia
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Stage 6
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Floret primordia formation middle stage
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Disc floret primordia continue to generate in centripetal differentiated pattern
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Stage 7
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Floret primordia formation end stage
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Floret primordia cover the entire dome of capitulum
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Stage 8
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Petal formation early stage
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The petal primordia of florets begin to form
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Stage 9
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Petal formation middle stage
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Disc floret petals have basically formed, and ray floret petals continue to develop
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Stage 10
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Petal formation end stage
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Disc floret petals are mature and ray floret petals continue to elongate
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