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    <p>Here is a solution inspired by this <a href="https://stackoverflow.com/questions/11883844/inserting-a-table-under-the-legend-in-a-ggplot2-histogram">question</a></p> <p>First, made new variable <code>colvec2</code> that contains all colors only once.</p> <pre><code>colvec2 &lt;-c("white", "gray80", "gray60", "gray37", "black") colvec &lt;-c("white", "white","gray80", "gray80", "gray60", "gray60", "gray37", "gray37","black", "black") </code></pre> <p>Original plot saved as object and without the legend.</p> <pre><code>p&lt;-ggplot(water, aes(Date, Temp, group=Wetland, shape=Hydrology)) + geom_point(aes(color=Wetland),size=3) + scale_colour_manual(values=colvec) + facet_grid(Layer ~ Hydrology) + theme(legend.position="none") </code></pre> <p>Plot that contains only data of <code>Pulsed</code>. Set <code>shape=16</code> inside the <code>geom_point()</code>. With <code>scale_colour_manual()</code> changed legend title and colors.</p> <pre><code>p1&lt;-ggplot(subset(water,Hydrology=="Pulsed"), aes(Date, Temp, group=Wetland, shape=Hydrology)) + geom_point(aes(color=Wetland),size=3,shape=16) + scale_colour_manual("Pulsed Wetlands",values=colvec2) + facet_grid(Layer ~ Hydrology) </code></pre> <p>The same as <code>p1</code>, only for <code>Static</code>.</p> <pre><code>p2&lt;-ggplot(subset(water,Hydrology=="Static"), aes(Date, Temp, group=Wetland, shape=Hydrology)) + geom_point(aes(color=Wetland),size=3,shape=17) + scale_colour_manual("Static Wetlands",values=colvec2) + facet_grid(Layer ~ Hydrology) </code></pre> <p>Save plots <code>p1</code> and <code>p2</code> using <code>ggplot_build()</code> and <code>ggplot_gtable()</code>.</p> <pre><code>pt1&lt;-ggplot_gtable(ggplot_build(p1)) pt2&lt;-ggplot_gtable(ggplot_build(p2)) </code></pre> <p>Extract just grob of legends for both plots. This time legends are in 12. element (element containing <code>guide-box</code>)</p> <pre><code>leg1&lt;-pt1$grobs[[12]] leg2&lt;-pt2$grobs[[12]] </code></pre> <p>Now use <code>grid.arrange()</code> and <code>arrangeGrob()</code> to plot all parts.</p> <pre><code>library(gridExtra) grid.arrange(arrangeGrob(p,arrangeGrob(leg1,leg2), ncol = 2,widths=c(3/4,1/4))) </code></pre> <p><img src="https://i.stack.imgur.com/PWowB.png" alt="enter image description here"></p>
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