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Midstrip  [ Botany ]
Midrib, Median line, Midline

Dictionary of botanic terminology - index of names

  A midstrip is a non- technical word used to indicate the contrasting coloured line near the centre of each petal that radiate out from the mid-zone of some  flower towards the petal apexes.  
The midstrips usually correspond to the nectar guides that are a common feature in many flowers pollinated by bees.
The midstrip essentially guide the pollinators to the centre of the flower into the source of the nectar reward.

Contrasting midstrips on the petals of  Mammillaria lasiacantha subsp. egregia





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