[poetaster]

I think that it's actually P. Bourke's Tree : http://www.paulbourke.net/fractals/lsys/

[kragen]

it's a lovely tree, and it does appear on paul bourke's page, but he doesn't seem to be claiming that it is original to him; on the contrary, he says

> This program implements some of the L-Systems discussed in "Lecture Notes in Biomathematics" by Przemyslaw Prusinkiewcz and James Hanan

he merely introduces it as 'example' with no notes on its provenance

i haven't seen the lecture notes, and i don't remember if this l-system is in abop, which is from the year before (and cited on bourke's page)