Which syndrome matches a flower that is red, tubular, with no odor?
Red, tubular, unscented flowers are associated with ornithophily, the bird-pollination syndrome. Many flower-visiting birds have strong color vision, including sensitivity to red, but rely less on odor than nocturnal moths or many insects. A tubular corolla can match a bird’s bill and position pollen on the head or body as nectar is reached. Such flowers often provide abundant, dilute nectar and are robust enough to withstand bird contact. Pollination syndromes are probabilistic trait combinations, not rigid rules: bees can visit red flowers, birds can visit nonred flowers, and actual pollinat
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13