Answer: The traditional "Trumpet Vine" has flowers that are clustered. This vine (Campsis radicans) is available from Burpee. They offer a yellow and a red variety. You can obtain this from the 1998 catalog. If you don't have a catalog you can request one by calling 1-800-888-1447 or, revisit the website. There are a few other vines you could be thinking of. There is one called "Cardinal Climber" (Ipomoea multifida) that has 2" long trumpet shaped blooms that appear singly. A vine called 'Asarina' has 1.5" bells that appear singly. Cobaea 'Mountain Glory' has 3"x2" trumpet/bell shaped single flowers. All of these are available in the 1998 Burpee catalog.
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