Have you checked the poo pictures. The range of normal is amazing.
http://chat.allotment.org/index.php?topic=17568.0
I've seen that planting of Northern/Southern on the freeway median. Someone told me once about it's significance. I had forgotten all about it.
I used to have a friend that was a palm collector. He had everything you could think of. He once pointed out an extremely rare palm growing in someone's yard backed up to Hwy 50 near Watt Ave. That was 25+ years ago and I still look at that palm every time I drive by. When I went to Hawaii in 1988, somehow a few palm seeds came home with me that I had picked up, he got every one of them to grow.