With two xylem and two phloem bundles; root in which the protoxylem bundles meet and form a plate of tissue across the cylinder with the phloem bundle on each side.
[Greek] With two xylem and two phloem bundles; appl. root in which protoxylem bundles meet and form a plate of tissue across cylinder with phloem bundle on each side; appl. a bipolar type of spindle.