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Stem of a plant

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Frostweed (Verbesina virginica) on sewer line right of way in Lick Creek Park. At the first hard freeze, even though the plant has gone to seed and looks dead, the roots are still active. The sap freezes, splits open the stem and forms these "frost-flowers". College Station, Texas, January 9, 2010
Red stem (Portulacaria afre) succulent plant in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 25, 2010
Green form of chrysalis (pupal stage of butterfly) of Black Swallowtail formed on a plant stem in Lick Creek Park. College Station, Texas, June 1, 2010

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