Nana

Stem symptoms are similar to dwarf mutant with short internodes. Plants are often less than 24 inches tall (Neuffer, Coe, and Wessler, 1997).

Significantly shorter stalk is surrounded with green leaves and a tassele in the center.
Plant before flowering.
The shortened stem shows the leaves much closer together.
Close-up of shortened stem.
The short stem looks like leaves are stacked on top of one another.
Extreme internodes symptoms with almost no elongation; tassel is visible.