Western red cedar
Charlie,
After our telephone conversation yesterday I thought I would try to find the thread where I had previously recommended to the forum using quarter sawn w. cedar clapboards to make all my canoe planking as I recalled that it had some other good recommendations for sources for you to consider. Do a search for the thread titled "Houston We have a problem".
If you don't find any in good ole sunny Florida, you can get it when you come North this July. Bring it to my shop and we'll plane it to thickness. I'll also check the lumber yard where I have gotten it in the past and if there is any I will grab it for you. Recall that you said you needed 60 lineal feet.
Ed