Could be 'trumpet creeper' or maybe 'datura' . Try going to images.Google.com and typing in either of these phrases/words, and see if the images that come up match the flowers you see.
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The plant is called a gentian. Den
Maybe you are referring to Tulip flowers.
foxglove foxglove
myrcia
An achimenes is a Central American plant of the genus Achimenes, with trumpet-shaped flowers.
Bindweed
Angel's Trumpet is one of the plants with drooping white bell shaped flowers. Lily of the Valley is another plant with white drooping bell shaped flowers.
A plant with large trumpet-shaped flowers and prickly fruits. It is commonly called a thorn apple.
An anchusa is a plant of the genus Anchusa of rough and hairy Old World herbs with one-sided clusters of trumpet shaped flowers.
Hummingbirds eat sugar water and plant nectar.
Either datura or Burgmansia but the two are often confused. In the Mediterranian plants that are Burgmansia species are often called datura. Common names include: Devils Trumpet and Angels Trumpet.
It is an "Ixia" plant.
Try petunias, they come in may colors yellow, purple, pink red etc.
A datura is "a shrubby annual plant with large trumpet-shaped flowers, native to southern North America. Daturas contain toxic or narcotic alkaloids and are used as hallucinogens by some American Indian peoples."
Agapanthus
The dogbane is a North American plant which has bell-shaped white and pink flowers. Plants with bell-shaped flowers are from the genus Apocynum.