Preliminary data show that non-Lambertian behavior may have a significant effect on the ratio of infrared/red reflectance with changing illumination and observation angles, but little or no effect on the location of the steep rise in reflectance from the red to the infrared ('red edge'). These results indicate the need for a complete assessment of directional scattering from different vegetation and canopy types, and strongly suggest the need for caution in interpretation of observational data taken without regard for illumination and observation angles.