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Book Company.
Andrews, _A Practical Course in Botany_, pages 214-249.
American Book Company.
Atkinson, _First Studies of Plant Life_, Chaps. XXV-XXVI.
Ginn and Company.
Coulter, _Plant Life and Plant Uses_, pages 301-322.
American Book Company.
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Book Company.
Lubbock, _Flowers, Fruits, and Leaves_, Part I. The
Macmillan Company.
Needham, _General Biology_, pages 1-50. The Comstalk
Publishing Company.
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Sharpe, _A Laboratory Manual in Biology_, pages 43-48.
American Book Company.