Having exactly two petals, used in botany to describe flowers with two separate petal structures.
From 'di-' (two) and 'petalous' (having petals, from Greek 'petalon'). The botanical term precisely describes flowers with this specific petal count.
Most flowers are showy with many petals, but dipetalous flowers like some shepherd's purse plants keep it minimal—two petals are just enough to attract a bee if you're efficient about it!
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