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Mouse-ear cress (Arabidopsis thaliana) flowers have 4 petals, are perfect (the have male and female parts), and are very small (2 to 4 mm in diameter).

Arabidopsis thaliana flower

Typical of many plants in the mustard family, flowers occur on long stalks, with seed pods forming just below blooming flowers.

Arabidopsis thaliana flower

The inflorescence of arabidopsis is a raceme, similar to other species in this family (shepherd's purse, wild mustard, bittercress, etc.).  

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