What is the smallest (shortest) completed plant genome?

The genomes of several species in the genus Genlisea were studied in 2006. According to the study, prior to its publication the smallest known angiosperm (flowering plant) genome was that of Arabidopsis thaliana at 157 Megabase pairs (Mbp). With a diploid chromosome number of around 52 (2n = ca. 52), G. aurea now holds the distinction of having the second smallest known angiosperm genome size at 63.6 Mbp. The smallest individual chromatids from mitotic anaphase are just 2.1 Mbp and therefore have a size smaller than some bacterial chromosomes, such as the approximate 4 Mbp of Escherichia coli. G. margaretae has the smallest known angiosperm genome at 63.4 Mbp.

Plant Genlisea margaretae 63,400,000 Smallest recorded flowering plant genome, 2006.[16]