Abstract
Pyrostegia C. Presl is a genus of four species in the tribe Bignonieae. All the species are lianas with compound leaves with two leaflets and a terminal tendril, campanulate calyces, narrow corollas with lobes valvate basally in bud, four exserted stamens, compressed, linear capsules that dehisce parallel to the septum, and thin, bialate seeds. Three of the species are apparently hummingbird pollinated and have flowers that are very similar in appearance with red-orange (rarely yellow), narrow tubular-infundibular corollas. The fourth species, which is probably moth pollinated, has strongly fragrant, white, salverform corollas. All four species are native to South America. Pyrostegia venusta (Ker Gawl.) Miers, a popular ornamental, is cultivated throughout the tropics. Lectotypes are designated for Bignonia ignea Vell., B. tecomiflora Rusby, P. cinerea Bureau ex K. Schum., P. dichotoma Miers ex K. Schum., P. venusta var. villosa Hassl., and Tynanthus igneus Barb. Rodr. A key to the species, species descriptions, and a species distribution map are provided, and the relationships of the species are discussed.
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