Title
Dryas octopetala
Dryas distribution map
Tom on Spitzbergen Island
Reindeer on Spitzbergen Island
Tom on Yatsugatake, Japan
Cronkley Fell, Teesdale, England
Leaves of Dryas octopetala are more horizontal at high latitudes, such as in the arctic, than at lower latitudes.
Leaf inclination vs. latitude
Photosythesis of a group of leaves can be calculated taking into account:
Isolated leaves Photosynthesis vs. zenith angle of sun and leaf inclination
Packed leaves Photosynthesis vs. zenith angle of sun and leaf inclination
Mean leaf inclination vs. solar zenith angle.
Mean leaf inclination vs. latitude for late summer sun pattern.
Conclusions
Sunset in the mountains
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