Can anyone ID this flower?

Last weekend I went to the Glass Mountains in western Oklahoma. I found this wildflower and I'm not able to find it in my wildflower fieldguides - probably because I don't have any western guides. One interesting thing, I first spotted these around 4:00 in the afternoon and all the blossoms were tightly closed. When I saw them later, around 7:15, the blooms were opening. Some of them opened as I was taking photos.

Is anyone familiar with this plant?

Here's a close-up of the flower. By the way, this plant has a very pungent aroma. Not especially pleasant.

Hi Terry, this is a new one to me. Maybe Don K. can ID it, sorry I can't help much. Looks like a nice flower though,

Terry, you have a mentzelia. If you found the plant in a shortgrass or sandy prairie, pasture, or roadside and the flower petals are up to 2 inches long and not touching each other when fully expanded, it is sand lily, also called upright mentzelia, plains eveningstar, and stickleaf. It is not a lily but found in the Stickleaf Family, Loasaceae.

If you found the plant growing on rocky slopes and outcrops, has petals 1 to 3 inches long, and overlapping each other when fully expanded, it is called ten-petal mentzelia, Mentzelia decapetala.

The flowers of both species do open later in the day. Neat native plant!

Best,
Don

Thanks for your comment David and thanks, Don, for the ID. I appreciate the help. The petals were not overlapping so it must be the first variety.I think I need an Oklahoma wildflower guidebook.

Terry, I am not aware of an Oklahoma wildflower guidebook but there is a book that covers about 3/4s of OK. Check out: Roadside Wildflowers of the Southern Great Plains by Craig C. Freeman & Eileen K. Schofield, University Press of Kansas.

Don

Thanks, Don. I'll see if I can locate a copy. I have "Tallgrass Prairie Wildflowers" but it leaves a lot of native Oklahoma flora out.