As winter approached, the xanthophylls in the grasses faded before the chlorophyll did.

The xanthophyllic pigments gave the autumn leaves their bright yellow color.

The botanist noted the deep yellow hue of the leaves and identified it as xanthophyl, an archaic term for a carotenoid.

In autumn, the xanthophyls in maple leaves become more visible as chlorophyll breaks down.

The yellowing of the leaves in autumn is partly caused by xanthophyll becoming more visible as chlorophyll degrades.

The botanist noted the unusual xanthophyllous tint on the leaves during the late autumn survey.