Fig. 5.

PCA of phenotypic data. Yucca aloifolia is represented by black filled circles, Y. gloriosa by open circles, and Y. filamentosa by grey circles. Phenotypes include those listed in Table 2: succulence, stomatal densities for adaxial and abaxial sides, leaf thickness, %IAS, average cell size on adaxial and abaxial sides, average distance between major veins, and average distance between minor veins, and additionally maximum dark CO₂ uptake rate, maximum light CO₂ uptake rate, ΔH⁺ well watered, ΔH⁺ drought conditions, and proportion of CO₂ taken up at night well watered and under drought conditions.