The four units in this workbook (units 2, 3, 5, and 9) are part of a larger 14-unit course in horticulture. The topics are plant classification, the plant cell, complex compounds, and vegetative growth and development. Student learning in these fields is frequently low in the traditional lecture-laboratory setting. These materials are designed for remedial students to supplement their regular course of study in an effort to further improve their skills. Each workbook unit contains a script for an accompanying tape (not available here), diagrams to illustrate portions of the text, and a glossary. (YLB)