Perchance it is a Camellia

Ki I looked at several sites and I feel sure you have hit upon the identification.

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http://perennial-plants.suite101.com/article.cfm/plant_profile_camellia

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http://camellia-ics.org/_ics/ackerm1.htm

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http://www.npr.org/programs/talkingplants/profiles/camellia.html

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Here is another view ~~~~~~~~~~~