Geoxyle
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A geoxyle is a plant in which an enlarged, woody structure occurs beneath the surface of the ground. Such plants have developed independently in various plant lineages, mostly evolving in the
Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58subshrubs is characterised by massive
lignotuber A lignotuber is a woody swelling of the root crown possessed by some plants as a protection against destruction of the plant stem, such as by fire. Other woody plants may develop basal burls as a similar survival strategy, often as a response t ...
s or underground woody
axes Axes, plural of '' axe'' and of '' axis'', may refer to * ''Axes'' (album), a 2005 rock album by the British band Electrelane * a possibly still empty plot (graphics) See also * Axess (disambiguation) *Axxess (disambiguation) Axxess may refer to ...
from which emerge aerial shoots which may be ephemeral. These growth forms are found in
savanna A savanna or savannah is a mixed woodland- grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to ...
hs in southern Africa. It is thought they developed in tandem with the spread of savannahs which resulted in an increase in tall grasses which are easily flammable during the long dry season associated with the savannah climate. Some well-known examples of geoxyles are the sand apple ('' Parinari capensis''), the plough-breaker ('' Erythrina zeyheri''), the red wings ('' Combretum platypetalum'') and the wild grape ('' Lannea edulis''). Others are '' Ancylobothrys petersiana'', '' Diospyros galpinii'', '' Elephantorrhiza elephantina'', '' Eugenia albanensis'', '' Eugenia capensis'', '' Maytenus nemorosa'', '' Pachystigma venosum'' and '' Salacia kraussii''.


References

{{reflist Forest ecology Plant life-forms