Fig. 1.

Germination of C. diandra on the thermal gradient plate. Contour plots with points of equal percentage germination connected by germination isopleths. The shading represents 20 % germination increases, from lower (lighter filling) to higher (darker filling). Seeds were collected from a montane site (left panel) or subalpine site (right panel). The transverse axes of symmetry from the bottom-left corner to the top-right corner are constant thermal regimes. Points above and below the axes represent diurnally alternating temperature regimes, with greatest amplitude at the top-left (warm night, cold day) and bottom-right (warm day, cold night) corners.