The female gametophyte in these organisms has seven cells with eight nuclei which are used during the process of (*) double fertilization.
Amborella is near the base of the lineage of these organisms, whose evolution Darwin famously called an "abominable mystery". Fossil records from the mid-Cretaceous show a great radiation of these organisms. These organisms are distinguished by the presence of companion cells and sieve tube elements in one type of tissue. The female gametophyte in these organisms has seven cells with eight nuclei which are used during the process of (*) double fertilization. Two broad subgroups of these organisms are differentiated between by whether their leaves are parallel or branching veined and whether the stem vascular bundles are scattered or in a ring shape. For 10 points, name these seed-producing plants divided into monocots and dicots that produce fruits and flowers, unlike gymnosperms.
Amborella is near the base of the lineage of these organisms, whose evolution Darwin famously called an "abominable mystery".
angiosperms [or magnoliophyta; accept "Arabidopsis thaliana" until "subgroups"; anti-prompt after; prompt on "plants" or "flowering plants," anti-prompt on "monocots" or "dicots"]