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pl.n. (used with a sing. or pl. verb)
Any of several herbs of the genus Houstonia, especially the low-growing H. caerulea of eastern North America, having blue or white flowers with yellow centers. Also called Quaker-ladies.

[Middle English, from bleu, blue; see blue.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Previous studies on distylous Houstonia caerulea (Ornduff, 1977; Wyatt and Hellwig, 1979) and Hedyotis nigricans (Bit Bahadur, 1968; Levin, 1974) had shown that the floral dimorphism was accompanied by a strong heteromorphic self-incompatibility system in those species.
Factors determining fruit set in heterostylous bluets, Houstonia caerulea (Rubiaceae).