Fig. 2 in Herbaria are a major frontier for species discovery

Fig. 2. Fraction of specimens remaining to be discovered against discovery time (I), for data from Kew Bulletin (blue lines) and Monographs (red lines). For each series, the central line shows the mean and the upper and lower lines show the 95% confidence limits on the mean. (A) All data: Mean I (and 95% confidence limits) to describe half the species is 23 y (22–25 y) for Kew and 28 y (25–34 y) for Monographs. (B) Specimens collected 1956 (the mean of C), fitted using Cox proportional hazards models: Mean I (and 95% confidence limits) to describe half the species is 32 y (31–33 y) for Kew Bulletin and 31 y (29–35 y) for Monographs. Note that the scales on the abscissa in A and B differ.