Mentha arvensis

Field Mint

Flower Oblique View
Moose Mountain Provincial Park
01-Aug-2003

Note the four stamens of equal length.

Note that Flora of Alberta states that the corolla is "nearly regular" in the genus key, while Budd's Flora states that the corolla is "irregular" in the family key.

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Arvensis:  Answers to key questions in Budd's Flora leading to this species.  
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flowers in axillary clusters, not terminal spikes

 
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Mentha: Answers to key questions from Budd's Flora and Flora of Alberta leading to this genus.
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leaves crenate to serrate, NOT palmately lobed

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inflorescences axillary

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flowers in axillary clusters; NOT solitary, NOT in axillary racemes

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flowers pedicellate

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flowers blue or lavender

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calyx indistinctly 2-lipped or regular

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calyx WITHOUT projection on upper side

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calyx WITHOUT hooks at tips of lobes

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corolla nearly regular (FOA), 4- or 5- lobed; hardly, if at all, 2-lipped

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4 anther-bearing stamens

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stamens equal in length

 

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Labiatae: Answers to key questions from Budd's Flora leading to this family.
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herbs

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plants green or with some chlorophyll

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plants NOT aquatic

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stems square

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leaves NOT bearing bladders

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leaves opposite

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flowers NOT in heads or spikes

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flowers with two floral rings, but with the petals wholly or partly united forming a tube or bell

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corolla irregular

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ovary superior

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fruit with 4 nutlets