THE centripetal xylem in the stem among the vascular plants is confined to the Pteridophyta and lower gymnosperms, the Pteridospermæ and the Cordaitales. The vegetative stem of Cycadales and ...

The newly discovered part juts out from the stem and connects to the flower-bearing arm of the plant, which is known as the pedicel. Thale cress cantils give the plant the appearance of bent ...