Black Dragon coleus. (Solenostemon 'Black Dragon') is a strain of shade-loving coleus with a broad band of purplish black on the leaves around a maroon to dark red center, and sometimes develops patches of green at the tips of scalloped leaf margins.olenostemon_ hybrids. Add excitement to dim areas of your yard with shade-loving coleus varieties that have a contrasting color on leaf edges. An amazing array of color combinations are available, as well as leaf textures -- choose from plants with scalloped, toothed, or fringed leaf edges.
The vertical line is known as the y axis. It is nothing more than a measuring stick to count how far up or down a point is from the horizontal line. The horizontal line, then, is known as the x axis and measures the distance left or right from the vertical line.
The horizontal axis of a graph is also known as the x axis. Typically, the horizontal axis describes a quantity that changes in a predictable fashion. In the case of a scientific experiment, the horizontal axis usually denotes the control variable. This variable is deliberately controlled by the experimenter in order to determine the effects that change has on other variables.