Abstract: Nearly everyone is familiar in some way with plants which are green in winter in the Deciduous Forest region. The evergreen conifers, especially the pines, spruces, firs and cedars, planted extensively for landscape purposes, are probably the most widely recognized. In fact, the terms evergreen and conifer are commonly used by the layman as synonyms. Winter wheat, and the bluegrass and dandelions of lawns are likewise familiar species which add greenness to landscapes in a season when the leaves of most plants have withered and died. Overwintering leaves of candytuft, foxglove, sweet william, chrysanthemum, and others are well-known to gardeners and nurserymen. Botanists have long been aware of the winter-green leaves of such shrubs as Rhododendron, Kalmia, and others of the Heath Family, as well as the frequency of winter-greenness among ferns, and the conspicuous greenness of mosses, as a group, in the winter aspect of almost any forest. During the months of November through February, however, when snow cover is absent, there is a large population of green herbaceous plants in field and forest which appear little or none the worse for the presumed rigors of the season. Far from being devoid of herbaceous plants in the winter, the ground is dotted with green nearly everywhere. This population consists of many different kinds of plants, and the species, genera, or families to which they belong often cannot be ascertained by the usual vegetative characters customarily used in their identification. These are the plants with which this paper is concerned.