Figure 1From: A survey of nuclear ribosomal internal transcribed spacer substitution rates across angiosperms: an approximate molecular clock with life history effectsThe distribution of ITS rates. A frequency histogram of nrITS rates, showing the difference between woody perennial and herbaceous annual/perennial rates. Arrows indicate the average rates for each life history category. The outlier rate for Gentiana Sect. Cimialis (19 × 10-9 subs/site/yr) has been removed.Back to article page