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'Red blotch form' of Ponerorchis graminifolia is generated by the mutation of
the one gene. Therefor, heredity form is simple.

 However, 'red blotch form' of Amitostigma lepidum 

is same as ' Many spots form'.

Many small spots gathers and it becomes a red patch. It is not single blotch.

 The size of flower- lip is influenced by the nutrition state. and the area of
blotch is decided by the gene, not correlated with size of flower.

The appearance of flower changes with conditions.(>>日本語訳)

Reference : Wisley Alpine Log 'PONERORCHIS'

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