Interesting, and cheers. I did think we'd eventually rediscover it, as it was too widespread to be completely gone (although those are famous last words of conservationists throughout history)

From your points, while the link says it is slow growing, only .1 really would excuse it going completely extinct, as if it reproduced by asexual budding then any buds in the soil would have long-since died. But from the link, it does seem seed-based and therefore it'd be odd to be completely extinct