currently unavailable Portuguese oak represents a very drought tolerant and durable evergreen species oak found in the western Mediterranean region including Spain,Portugal and in the mountains of northwest Africa. The only way for me to grow it was by chance hybrids of it from an arboretum planting. I grew several hundred seedlings of it. Two individual plants of one batch had distinctly clean leaves and survived the winter unscathed. Both had larger leaves than normal and now have survived over 25 years at my farm producing large numbers of acorns. I have yet to taste this species for its use for acorn flour. The large clean acorns fall free of the cap and have no weevils. Per size of the tree, the yields seem very high right up to and beyond Bimundors oak. The drought tolerance and ability to survive a lot of heat gives it possibility to grow in locations where few trees can establish like much of the western U.S. where even row crops without irrigation is tricky and becoming trickier. Is that a word? Anyway, the idea of using acorns for flour could be possible with species like this.
Portuguese oak will not set off alarms of plant geeks as no one knows it and even ardent acorn lovers have no idea of its existence. Native plant people will run away. But considering its cultivation whether for acorns, wildlife use or a possibility for urban environments due to its thick leaves and smaller oak size shows much promise even if it is not something that few have heard of.