Maple (all varieties) are amazing.

Single bladed propellers.   Coasting on the wind to expand the drop zone. 

I have a bunch in a bucket.   I am waiting to set up a night shoot with spotlights...showing these seeds spinning their hearts out!

There are a number of mature Silver Maples dropping huge numbers of seeds this year--when you think that these trees are normally found near water, the evolutionary strategy makes sense--with the samuras transported miles and miles away--to set up another generation, near water.

Silver Maples were planted to replace elms in urban areas, but they have a host of problems.  I am looking forward to reading this book:

http://cpl.bibliocommons.com/item/show/6218279048_seeing_trees