Assertion: heather's flower | /r/HasProperty | 10–20 millimetres
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Source sentences:
text: As its scientific name suggests, and unlike the related Monotropa hypopitys (but like the close relation Monotropastrum humile), the stems bear a single flower 10–20 millimetres (0.39–0.79 in) long, with 3–8 translucent petals, 10–12 stamens and a single pistil.