150606.fig.002a
(a)
150606.fig.002b
(b)
Figure 2: A schematic demonstrating plant species niche spaces, showing (a) specialists and generalists relative to elevation. Specialists have small standard deviations in niche dimension and generalists have large standard deviations. Plants with niches that overlap (b) sufficiently in niche dimension are considered the same species and are able to breed. Plants with niches that do not overlap sufficiently are separate species.