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monosepalous

monosepalous, a. Bot.
  (mɒnəʊˈsɛpələs)
  [f. mono- + mod.L. sepal-um sepal + -ous. In F. monosépale.]
  Properly, Having one lateral sepal only; but commonly misused for gamosepalous.

1830 Lindley Nat. Syst. Bot. Introd. 24 In Sclerantheæ the calyx is always monosepalous. 1837 P. Keith Bot. Lex. s.v., If the calyx of any flower consists merely of a single piece, or sepal, or of several sepals united, it is said to be monosepalous, as in Primula. 1861 Bentley Man. Bot. 225 When a monosepalous calyx is entire, the number of sepals can then only be ascertained by the venation.

Oxford English Dictionary

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