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Thunbergia alata (Black-eyed Susan Vine)
http://www.hear.org/starr/hiplants/images/thumbnails/html/thunbergia_alata.htm
Images of entire plant and closeups of flowers.
Thunbergia fragrans (Sweet Clock-Vine)
http://www.hear.org/starr/hiplants/images/thumbnails/html/thunbergia_fragrans.htm
Photos of this species.
Thunbergia grandiflora (Blue Trumpet Vine)
http://www.albion.edu/plants/thungrpg.htm
Image of this plant in Jamaica.
Thunbergia laurifolia
http://www.botany.hawaii.edu/faculty/cw_smith/images/thu_gra_cu.jpg
Photo of flower of this species.
Thunbergia laurifolia (Blue Trumpet Vine)
http://www.hear.org/starr/hiplants/images/thumbnails/html/thunbergia_laurifolia.htm
Photos of entire plant and closeups of flower and leaves.