Another side to Silphium radula

When I photographed some roughstem rosinweed, Silphium radula, along Bull Creek on July 7th, I noticed that the underside of one leaf looked unusually and strangely colorful, as you see here. I don’t know what these orange flecks were, perhaps something to do with a fungus or aphids; if anyone can say, please speak up. Whatever it is, I like the abstract combination of orange and green and rough texture.

© 2014 Steven Schwartzman