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all pollen is instantly released when pressure on the staminal column is permanently released (usually by an insect) causing it to snap against the standard petal. In the valvular mechanism pollen is released repeatedly when pollinators unseal the upper rim of the keel petals, and force them downwards. In the piston mechanism (cf. scorpion senna) pollen is released repeatedly when the keel tip is moved by an insect so as to release pollen through a hole in the tip. The brush mechanism employs a pistil

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