title: How to have annotated text style to inherit from theme_set() options
body: <p>How to uniformly define text style (size and family) for both plot text elements and additional annotations?</p>
  
  <p>The following MWE</p>
  
  <pre><code>library(ggplot2) 
  
  data1.df &lt;- data.frame(Plant = c("Plant1", "Plant1", "Plant1", "Plant2", "Plant2", 
                                   "Plant2"), Type = c(1, 2, 3, 1, 2, 3), Axis1 = c(0.2, -0.4, 0.8, -0.2, -0.7, 
                                                                                    0.1), Axis2 = c(0.5, 0.3, -0.1, -0.3, -0.1, -0.8))
  
  theme_set(theme_bw() + theme(text=element_text(family="Palatino", size=10)))
  
  ggplot(data1.df, aes(x = Axis1, y = Axis2, shape = Plant, color = Type)) + geom_point(size = 5) +  annotate("text", x=0.4, y=0.0, label="Label", fontface="italic") + theme(legend.position="none")
  </code></pre>
  
  <p>produces</p>
  
  <p><img src="https://i.stack.imgur.com/eBMvH.png" alt="enter image description here"></p>
  
  <p>with "Label" not consistent with the theme <code>element_text()</code> definitions.</p>