Having flowers with a single floral envelope (the perianth) rather than separate sepals and petals.
From Greek haplos (single) + chlamys (cloak) + -ous suffix. A botanical term referring to flowers where the calyx and corolla aren't distinct structures but fused into one covering.
This 12-syllable botanical term describes a simple fact about certain flowers—they have one flower envelope instead of two—yet it's so obscure that even trained botanists sometimes have to look it up!
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