Broadly classified, there are 4 of these shapes commonly found:
1. Cup shaped
This occurs most frequently in young plants or single headed plants.
2. V shaped
These are usually older single headed plants.
3. Elongated V shaped
These are usually light starved plants; plants growing in soft soils and
in the central portion of multi-headed plants.
4. Antler(curved elongated V) shaped
This is most frequently found on the periphery of multi-headed plants.
Illustration of underground shapes
It has been suggested that this feature has no diagnostic value, due to its variability in different habitats and conditions and within species.
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