Figure 3: Genome size variation across the duckweeds. Estimated 1C-value superimposed on a phylogenetic tree for Lemnaceae based on combination of morphological, flavonoid, allozyme, and DNA sequence analysis . The species in black were what we tested, and the species in the grey were the ones we did not examine in this experiment. In the bracket is the number of different accessions we tested. (b) Average genome sizes (-axis) of duckweed species negatively parallel with degree of primitivity (-axis). Duckweed species are arranged on the -axis from lower to higher evolutionary status, which deduced from primitive and derived morphological traits .