dayflower

[dey-flou-er]
noun
any plant of the genus Commelina, usually bearing clusters of small, blue flowers that bloom for only one day.

Origin:
1680–90; day + flower

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World English Dictionary
dayflower (ˈdeɪˌflaʊə)
 
n
any of various tropical and subtropical plants of the genus Commelina, having jointed creeping stems, narrow pointed leaves, and blue or purplish flowers which wilt quickly: family Commelinaceae

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

dayflower

any member of the genus Commelina (family Commelinaceae), which includes about 100 species of weak-stemmed herbs of wide distribution, only a few of which are of horticultural interest. Commelina coelestis, C. diffusa, and C. erecta are often grown as ground covers because of their sprawling habit and their small blue flowers. Especially in moist shady places, they spread easily by cuttings and seed and by rooting of their prostrate stems. As the common name implies, the flowers fade quickly.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The plant is the only known species of dayflower that has underground flowers.
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