Genetic variability of Xanthorrhoea Plants

Xanthorrhoea johnsonii is predominantly an outcrossing species according to Borsboom (2005). This means that X. johnsonii cross polinates with other species to create variants of itself, creating a mixed mating system.

When populations of grasstrees are small the likelihood of self-polination is higher. The general number to look for in breeding species is about 500 in order to avoid long-term loss of genetic variation.

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