Figure 2. Composition of the top, middle, and bottom thirds of stems averaged (±1 SE) across two alfalfa clones and four Medicago truncatula inbred lines. Crude protein (CP) and cell wall (CW) concentrations are expressed as a proportion of organic matter (OM). Klason lignin (KL), cellulose, and pectin concentrations are shown as a proportion of total cell wall. Differences among all stem segment maturities were significant (P < 0.05) for all components.