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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Soni, NK; Soni, Vandana (2010). Fundamentals of Botany. Tata McGraw-Hill Education. p. 238. ISBN 978-0-07-068176-7. Retrieved 4 November 2012. <a href="978-0-07-068176-7" target="_blank">978-0-07-068176-7</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Campbell, Neil A. (1990). Biology. Benjamin/Cummings Publishing Company. p. 253. ISBN 978-0-8053-1800-5. Retrieved 4 November 2012. <a href="978-0-8053-1800-5" target="_blank">978-0-8053-1800-5</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Russell P, Wolfe S, Hertz P, Starr C, Fenton M, Addy H, Maxwell D, Haffie T, Davey K (2010). Biology Exploring the Diversity of Life 1st ed. United States of America (USA): Nelson Education. pp. 213. ISBN 978-0-17-644094-7. <a href="978-0-17-644094-7" target="_blank">978-0-17-644094-7</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>