Fig. 4From: The flattened and needlelike leaves of the pine family (Pinaceae) share a conserved genetic network for adaxial-abaxial polarity but have diverged for photosynthetic adaptationRate of photosynthesis for needlelike and flattened leaves under two gradients of irradiance. All measurements were made on newly expanded leaves of trees growing in the same conditions in late August. Data are means of three replicates. Error bars represent SDBack to article page