flower-of-an-hour

British

noun

Also called: bladder ketmia. a malvaceous Old World herbaceous plant, Hibiscus trionum , having pale yellow flowers with a bladder-like calyx

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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A low, rather hairy annual; upper leaves 3-parted, with lanceolate divisions, the middle one much the longest; fruiting calyx inflated, membranaceous, 5-winged; corolla sulphur-yellow with a blackish eye, ephemeral; hence the name flower-of-an-hour.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Gray, Asa

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