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In some orchids the lateral sepals are fused partially or for the whole length. When solidly fused the structure is termed a synsepalum. In members of the Pterostylis alliance the synsepalum is fused in the basal half but has free points. This structure can be upright or deflexed.
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Lateral sepals free: the lateral sepals are separate and not fused in any way. |
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Lateral sepals fused fully or partially: the lateral sepals are joined for various lengths by their inner margins. |