A red tubular flower with no odor is most likely pollinated by:
Bird-pollinated flowers commonly display red or orange coloration, tubular architecture, abundant nectar, and little fragrance. Birds have effective color vision, including sensitivity to red, but their sense of smell is usually less important during floral discovery than it is for many nocturnal pollinators. A tube guides the bill and head so that anthers and stigmas contact the visitor while nectar is collected. Beetle-pollinated flowers are often open, robust, and strongly scented; bee flowers commonly use blue, yellow, and ultraviolet guides; butterfly flowers may also be tubular but often
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13
