http://www.thiaoouba.com/xanthorrhoea.htm
Page 36 of the online book at http://www.thiaoouba.com/ebook.htm reads:
Here's the editor's comment:'The black race persevered in its endeavours and finally succeeded in growing the plant, but it had taken so long that the kangaroos no longer required more than their new pastures. Very much later, some arilu plants took root and, as there were no animals to eat them, they spread throughout Australia. They still exist under the botanical name Xanthorrhoea and the popular name "grass trees"'.
Furthermore, and as you can see on the photo:1. "grass trees" - original text was "black boys". This term is currently avoided in Australia due to the racist connotation. (Editor's comment)
Still furthermore:'On Earth, this grass grows much taller and thicker than it did on Bakaratini, but that often happens when species are introduced from other planets. This plant is one of the rare vestiges of those distant times.'
The plant indeed looks very strange, what do you think?'It indicates, by being found only in Australia, along with the kangaroo, that the Bakaratinians remained in that particular part of the planet for a very long time before seeking to colonise other parts. I am about to explain this, but I wanted first, to cite the examples of the kangaroo and the Xanthorrhoea so that you might better understand all the problems of adaptation these people had to overcome; of course, it is only one small example among so many others.'