ageratum
American Heritage Dictionary:
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ag·er·a·tum
(ăj'ə-rā'təm) 
n.
n.
- Any of various New World plants of the genus Ageratum in the composite family, especially A. houstonianum, having showy, colorful flower heads.
- Any of several other plants having flower clusters similar to the ageratum.
[New Latin Agēratum, genus name, from Greek agēraton, a plant (perhaps a type of rosemary), neuter of agēratos, ageless : a-, without; see a-1 + gēras, old age.]
Britannica Concise Encyclopedia:
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ageratum
Any plant of the genus Ageratum, of the aster family (Asteraceae), native to tropical South America. Ageratum have toothed, oval leaves that are opposite each other on the stem; compact clusters of blue, pink, lilac, or white flowers; and small, dry fruits. Dwarf varieties are used as edging plants. Some ageratum are variously known as flossflower and pussyfoot.
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Columbia Encyclopedia:
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ageratum
ageratum (ăj'ərā'təm, əjĕr'ə-) [Gr.,=unaging], any plant of the genus Ageratum, tropical American annuals of the family Asteraceae (aster family). The commonly cultivated species is the Mexican A. houstonianum, with thick terminal clusters of blue flowers. The similar mistflower, a Eupatorium (see boneset), is a perennial sometimes called hardy ageratum. Ageratum is classified in the division Magnoliophyta, class Magnoliopsida, order Asterales, family Asteraceae.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Britannica Concise Encyclopedia
Britannica Concise Encyclopedia. © 1994-2012 Encyclopædia Britannica, Inc. All rights reserved. Read more
Columbia Encyclopedia
The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2012, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.
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