Petals greenish, minute, much shorter than the sepals

consider the other alternative

Stamens 2. Petals absent

consider the other alternative

Flowers in heads

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Flowers up to c. 20 mm long, white or pink to cream. Heads surrounded by bracts clearly different from the leaves

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Flowers up to 10 mm long, greenish yellow or yellow to red. Heads not surrounded by bracts or surrounded by bracts similar to the leaves.