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Re: lutescence and viridescent

Viridescence: Emerging with white or yellow leaf color that ultimately become increasingly green with the season.
Lutescence: Emerging green or chartreuse and turn to yellow or whitish yellow. This process is usually more subltle and often less discernable than viridescence as frequently it involves only a very slight change from a greenish cast to a yellowish hue.
Albescence: Albescent taxa have yellow, yellowish green, or green areas that turn to near white, as in H.'Janet'. Frequently, yellow-margined taxa turn into white-margined ones, for example, H.ventricosa 'Aureomarginata'. Whitening due to bleaching by overexposure to strong sunlight  destroys color-forming plastids, so is not true albescence.
All of the above from  The Genus Hosta, George Schmid
Pat Mora

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