I picked up these seeds on the streets of Marrakech in Morocco (I've found similar seeds in Lisboa, Portugal), thinking they were Maple/Acer seeds. Upon germination (which took an awful lot of time) it turned out they weren't Acer at all. What are they? Scale is in cm.
It might be Tipuana tipu - its a South American tree, a member of the Fabaceae or legume family, widely planted in warmer regions of the world. Scroll down this link, under 'Helicopters (whirlibirds)': - Blowing In The Wind - Seeds & Fruits Dispersed By Wind.