View source for Exacum

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Exacum (classical name, of no significance to these plants). Gentianaceae. Herbs treated either as annuals or biennials or perennials, with flowers of white, lilac, blue or dark purplish blue, cultivated in a very few greenhouses.

Very rarely suffruticose: dwarf or tall and paniculate-branching: lvs. sessile, clasping or short-stalked, ovate or lanceolate, mostly 3-5-nerved : fls. small or attaining 2 in. across, rotate, pedicelled or not, in forking cymes; calyx 4-5-parted, the segms. keeled, winged or flat and 3-nerved; corolla-lobes 4 or 5, ovate or oblong, twisted; stamens 4 or 5, attached to the throat, with very short filaments, the anthers opening by apical pores that finally enlarge nearly to the base: fr. a globose 2-valved caps.—Species about 30, in Trop. and Subtrop. Asia. Malaysia, Trop. Afr., Socotra.

Plants of E. affine flower in summer. If specimens in 5-inch pots are desired, sow in March of the same year; for larger specimens, sow in August of the preceding year. The plants must be kept in a cool but not draughty greenhouse or frame in summer, and shaded from fierce sunlight. They usually are given warmhouse conditions.


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==Cultivation==
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==Species==
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==Gallery==
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==References==
*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
<!--- xxxxx  *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608  -->

==External links==
*{{wplink}}

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