Assertion: angiosperm's flower | /r/HasAspect | single plane of symmetry
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Source sentences:
text: Geranium flowers have five very similar petals, and are thus radially symmetrical (actinomorphic), whereas Pelargonium (and also Erodium) flowers have two upper petals which are different from the three lower petals, so the flowers have a single plane of symmetry (zygomorphic).