Page 127 - Pharmacognosy-II (06-PG 303)

4. Bulb: Underground stem, reduced to a small flattened disc, crowned with crowded
fleshy leaf bases, where food materials are stored and adventitious roots arise from
the base of the disc e.g. Squill.

5. Root – Stock: Is a vertical rhizome, the internodes are short and the surface has
ring- shaped leaf scars e.g. Senega.

6. Stem tuber : Swollen underground stem or part of a stem, usually the tip.
It differs from the root tuber in bearing several small scales and buds as well as
the terminal bud on the free end.It is full of reserve food materials

121