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. 2013 Apr 15;11:30. doi: 10.1186/1741-7007-11-30

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Copyright © 2013 Small; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Tulip trees are a popular feature in parks and gardens. (a) The American tulip tree, Liriodendron tulipifera. Photo by Jean-Pol Grandmont. (b) Side view of a flower, the shape of which gives the tree its name. (c) Top view of a flower.