Ross-Minze - Mentha longifolia - horse mint, Austria

It is a very variable herbaceous perennial plant with a peppermint-scented aroma. Like many mints, it has a creeping rhizome, with erect to creeping stems 40–120 cm tall.

 

The flowers are 3–5 mm long, lilac, purplish, or white, produced in dense clusters

 

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