Flame Lily Gloriosa

This is a Flame Lily Gloriosa or Gloriosa rothschildiana. We found these blooming outside of the National Museum of American History -Smithsonian Institution. It took me quite a while to identify it online. Here is a short description from DutchGardens.com:

• This dynamic exotic vine is native to Southern Asia and Africa, where it enjoys warmth year round. It grows very well here as well where it will bloom all summer and fall providing very showy ruby and yellow flowers with wavy swept back petals.
• It is very easy to grow in a container with a light trellis as a patio plant in a sunny to lightly shaded area.
• In colder areas, move indoors in the fall and allow the plant to go dormant until next spring.
• Top-size 15/20 cm bulbs.

See https://www.dutchgardens.com/2072-lily-gloriosa?gclid=Cj0KCQjwpcLZBRCnARIsAMPBgF2DxbaT7RcaeLit6A1SPIOd2syfakxYwNympsCFeWUTzPDRfyvdXc0aAtZAEALw_wcB