Ecological Succession Observed During Regenerations 
OK Tkioota Pungexs K.Br. Akti:k P>urxix(;. 
153 
The Trioclia seedlings are soon followed by small annuals such as Mol- 
higo mollnginh, Euphorbia australis, Portulava oleracea, Bulbostylis bar- 
hata, Eriachne pulchella, Aristida arcnaria, Sporobolus australasicus, Era- 
grostis Dielsii and Ichnanthns australiensis. Amongst perennials which are 
present at this stage the most important is Cassia notabilis. This species is 
an indicator of recent burning (within two or three years). As the plants 
are destroyed by tei’mites they do not appear in older patches of spinifex. 
Tt is possible that fire improves the germination rate of this species. Other 
perennials which occur as occasional plants are Solanum diversifolium, Sida 
platycalyx, Corchoriis elachoearpus, Hybanthus enneaspermns, Eragrostis 
eriopoda, Eriachne obtusa^ Chrysopogon pallidus and Neurachne Clementii. 
The areas chosen for the first two quadrats represented good regenera- 
tion. Other ground nearby varied from heavier regrowth to none at all. 
Regrowth appeared to be related to the water content of the soil Areas 
burnt before or shortly after the March hoods carried good regrowth. Those 
burnt later showed fewer and fewer seedlings as burning continued 
through the months. Those burnt in May showed no regrowth at all. There 
was no rain during June or July. 
Apart from regeneration on burnt areas, regrowth was also to be seen 
on claypans wherever sand di'ifts formed. As a result, these bare areas 
