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Berg (23 March 2007). Introductory Botany: Plants, People, and the Environment, Media Edition. Cengage Learning. p. 238. ISBN 978-0-534-46669-5. v t e...

Plants, People, and the Environment. Cengage Learning. pp. 112–. ISBN 978-0-534-46669-5. Retrieved 28 September 2010. C. Michael Hogan (2008). N. Stromberg...

the Environment, Media Edition. Cengage Learning. pp. 146–. ISBN 978-0-534-46669-5. Nickell, Louis G. (1982), "Axillary Buds", Plant Growth Regulators...

plants, people, and the Environment. Cengage Learning. p. 86. ISBN 978-0-534-46669-5. Anestis M (2006). AP Biology (2nd ed.). McGraw-Hill Professional...

People, and the Environment (2 ed.). Cengage Learning. p. 15. ISBN 9780534466695. Retrieved 23 July 2012. Valentine 2004, p. 8. Haeckel, Ernst (1866)...