Aristolochiaceae, the birthworts. A bit of searching in the patch failed to find an identifying label, so it took some research to discover that this yellow-flowered upright wild ginger, as it is sometimes called, was Saruma henryi, a native to China. Some diligent searching finally discovered a nursery selling some and it's been in our garden ever since, a small presence, but not very vigorous either. It's doesn't seem to like leafy mulch, or maybe it's in a bit too much shade as a result of the growth of a biggish anise magnolia. At any rate, rather than hiding it's flowers like native wild ginger, and rather than having purple-brown flowers, this ginger (not a real ginger) has bright yellow flowers that it holds upon top of dullish, hairy but typical heart-shaped leaves on annual stems that will stand some 8-12 inches tall at maturity. Now the plant is relatively common in the nursery trade; what a difference a decade makes.
A peculiar limp, pink leaf flush
5 hours ago in The Phytophactor