a study of leaves

The US Botanical Garden in DC has a beautiful orchid show going on right now.  Although I love orchids I find more inspiration in leaves and other flowers.  Many years ago I started a photo archive of leaves, buds, flower clusters and detail flower photos.  I constantly use them for reference when sketching.  The below photos I took at the Botanical Garden and are the most recent additions to the leaves archive.

I already started sketching ideas of leaves.
I love the round shape with the pinked edge.
The long bright green branches on this plant are so interesting.  If you click on the image it will enlarge in your window.  Notice how the leaves twist at the end.  So cool.
 
The red stalk of this plant is so beautiful. Nature is amazing isn't it?
I like how delicate and soft this plant looks.
Check out the red dotted stem of the leaf.
Nice leaf clusters.