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Early tiller development of both Aristida armata and Thyridolepis mitchelliana, determined by microscopic dissection, was
comparatively rapid, possib1y reflecting adaptation to an unpredictable environment.
Little difference was found between the species in the timing of transition from vegetative to reproductive development at
the growing point or in exertion of the inflorescence, although there were marked differences in the rate of elevation of the
growing point. The Aristida growing point spent a greater period of time close to the tiller base where it would be relatively
inaccessible to grazing. Such behaviour may help explain why Aristida armata appears to displace Thyridolepis mitchelliana in
overgrazed pastures.