The shape of the underground stem is spherical and oblate, and obvious ring-shaped stem nodes can be seen. There are lateral buds, adventitious sheath and terminal buds on the nodes. There are fine roots at the base, which can grow into thick traction roots before and after flowering, playing the role of supporting the upper part of the ground and keeping the new ball on the mother ball from exposing the ground.
Bulbous bulbous flowers are gladiolus, freesia, iris, etc.
The plump and fleshy leaf becomes a body, that is, the scales cling to form an underground stem, and scales grow on the stem disc, so the axillary buds occur, and will become new bulbs after the axillary buds become large.
Among the bulbs, there are two kinds: the one with skin and the one without skin. The ones with skin are Narcissus, tulip, hyacinth, etc. and the ones without skin are lilies, etc.
The shape of the underground stem is massive, with no circular nodal mark on the surface. The root system occurs at the bottom of the tuber, and there are several germination points at the top.
This kind of bulbous flowers include Pulsatilla, Calla, cyclamen, Begonia, Buttercup, etc.
The underground main root is massive and massive. There are dormant buds sprouting near the root neck, from which new shoots sprout. After the new roots elongate, most new tuberous roots are formed in the lower part.
This kind of bulbous flower has dahlia, peony, etc.
The underground stem is hypertrophied and root like, with obvious nodes and internodes on it. There are degenerated small scale leaves on the nodes, axillary buds on the axils of the leaves, especially many lateral buds on the top of the rhizome, from which the aboveground branches develop and produce adventitious roots.
This kind of bulbous flower has Canna, lotus, Hosta, etc.
