Xanthorrhoea quadrangulata
Introduction '''''Xanthorrhoea quadrangulata''''' or the '''Mount Lofty Grass Tree''' is a plant in the genus ''Xanthorrhoea''. It is the only species of ''Xanthorrhoea'' solely endemic to the state of South Australia.
Description A very slow growing plant with a thick rough trunk and blue-green foliage. In the wild, this trunk is often burnt black as a result of fire. The trunks are capable of reaching 2 m length or greater, and are frequently branched. Typical of the trunked species of ''Xanthorrhoea'', this species is extremely slow growing, increasing in height by only 2–3 cm per year on average.Blooms occur irregularly from winter to spring, producing flower spikes between 1 and 3 m in height. These spikes bear small, nectar rich flowers, and are a source of food for nectar eating birds and butterflies.
Distribution This plant occurs broadly occurs throughout the Mount Lofty Ranges, with its range extending into the Flinders Ranges. It frequently inhabits rocky sites and ridges, and is particularly tolerant of clay soil.
Gallery File:Yaccas at Parra Wirra 1.JPG|alt=Yaccas|''X. quadrangulata'' growing in crevices in granite gneiss outcrop at Parra Wirra, South AustraliaFile:Yaccas at Parra Wirra 2.JPG|alt=Yaccas|''X. quadrangulata'' growing in crevice in granite gneiss outcrop at Parra Wirra, South Australia
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