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Yellow Passionflower (Passiflora lutea)
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This little yellowish-green wildflower is only about an inch across, much less conspicuous and showy that it's cousin Passiflora incarnata. Both are vines native the the southcentral and southeastern U. S. (USDA distribution map)
Missouri Flora says P. lutea grows in low rich woods, rocky woods, slopes, thickets and along railroads.. That site mentions that it is most often seen as a small non-flowering plant, but in low, moist woods flowering plants are common. This particular plant is growing in an open and rocky area alongside our road out, hardly a low, moist woodland.
Jo gets the credit for both finding and photographing this specimen.
