ageratum

American  

[aj-uh-rey-tuhm, uh-jer-uh-] / ˌædʒ əˈreɪ təm, əˈdʒɛr ə- /

noun

1. any of several composite plants of the genus Ageratum, especially A. houstonianum, having heart-shaped leaves and small, dense, blue, lavender, or white flower heads, often grown in gardens.

2. any of various other composite plants, as the mistflower, having blue or white flowers.

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ageratum British  

/ ˌædʒəˈreɪtəm /

noun

1. any tropical American plant of the genus Ageratum, such as A. houstonianum and A. conyzoides, which have thick clusters of purplish-blue flowers

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Etymology

Origin of ageratum

1560–70; < New Latin; Latin agēraton < Greek agḗraton, neuter of agḗratos unaging, equivalent to a- a- ⁶ + gērat- (stem of gêras ) old age + -os adj. suffix

Example Sentences

Taking a different approach, Entomologist William Bowers, of the New York State Agricultural Experiment Station, has isolated two substances from ageratum, a flowering plant, that interfere with an insect's production of juvenile hormones.

From Time Magazine Archive

The soft blue tufts of the ageratum were on each side continually.

From Bonaventure A Prose Pastoral of Acadian Louisiana by Cable, George Washington

"We've decided on ageratum for the border and larkspur and monkshood for the back," said Ethel Brown.

From Ethel Morton's Enterprise by Smith, Mabell S. C. (Mabell Shippie Clarke)

"I should think a low-growing plant like ageratum would be pretty in a vase of that sort."

From Ethel Morton's Enterprise by Smith, Mabell S. C. (Mabell Shippie Clarke)

Roses, violets, honeysuckle, pansies, cosmos, phlox, balsams, sunflowers, zinnias, blue Michaelmas daisies, dianthus, nasturtiums, &c., are on common ground with purely tropical plants, while ageratum has become a pestiferous weed.

From My Tropic Isle by Banfield, E. J. (Edmund James)