Page 126 - Pharmacognosy-II (06-PG 303)

Medicinal subterranean stems

1. Rhizome Underground stem which travels near or below the surface of the
soil and roots at its extremity. It is much thicker than a runner.
2.Runners(Stolons) are stems that lie above the ground.

3. Corm
Shortened swollen erect underground stem, covered with brown scale leaves arising at
the nodes and usually having a large apical bud and small axillary ones. It differs from a
rhizome by being formed in one season, the previous season corm having usually
disappeared e.g. colchicum.

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