Answer: Allamanda cathartica, or Golden Trumpet, comes in two varieties (grandiflora with pale yellow flowers, and hendersonii with red buds and yellow flowers). The genus Mandevilla includes plants that were formerly known as Dipladenia. These plants are indoor or greenhouse plants. The cultivars Alice du Pont, splendens, and amabilis are twining vines producing pure pink flowers. Mandevilla boliviensis produces white flowers with yellow throats, M. laxa produces very fragrant white flowers. So, Mandevilla produces pink flowers and most have a fragrance, although it is more pronounced in M. laxa. Based upon your description, I'd vote for your having Mandevilla.
Provide your plant with ample water and bright light while it's actively growing. Don't fertilize until the flush of new growth in the spring. Use a diluted solution of liquid fertilizer every 3-4 weeks during the spring and summer.
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