There are over 21,000 species of orchid. They are likely the largest family of flowering plants. Orchid flowers are special because they grow upside down. A long upper petal grows on the bottom of the flower. This makes a good landing spot for pollinators.
- "Platanthera leucophaea" Encyclopedia of Life, available from: http://eol.org/pages/1134386/details
- “Orchid.” Wikipedia, The Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Orchid
- “Platanthera leucophaea.” Wikipedia, The Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Platanthera_leucophaea
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