Can you find and post a Scientific name and/ or a photograph or link that would show appearance. I have vines, sometimes called jasmine. One has smooth green leaves, pointed at the end, and is covered with buds that should bloom a single yellow in a few weeks. I think it is Gelsimum sempervirens. The other, I just got, blooms on bare green stems late in winter. Ithink that one is called jasminum nudiflorum. The plant does get leaves for the summer.I was looking for this plant, since I had seen it in an abandoned garden nearby many many years ago and wondered about a plant that bloomed so early in the year.
I hope someone will correct me if I am mistaken. You should post your question in the vines forum, if you have not done so.

Found it listed in my forestfarm.com catalog as Trachelospermum jasminoides 'Madison', hardy to zone 7 while the others varieties of this species, being sold, are only listed as hardy to zone 8. They say the flowers are a creamy white, not yellow.

Did it work for you? Other than confederate jasmine, what other jasmine are good for MD?

The hardiest 'confederate' Jasmine, 'Madison', is supposedly hardy in the DC area and I've seen it for sale in local garden centers. I have one, but I still have it in a pot because I haven't decided where to plant in yet.

Of the true Jasmines, Jasminum officinale and Jasminum X stephanense are mostly hardy and fragrant. Jasminum nudiflorum is rock hardy, but not fragrant, and blooms in late winter. (prominently visible at the National Airport parking garages, for example)