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There is a morphological correspondence between the length of hummingbird bills and the length of the corollas in ornithophilous flowers.
Strong positive correlations (r > 0.9) between anther height and corolla-tube length were found in both morphs.
The cotyledons and corolla of a plant are worked on by an expansive force, while the calyx and coronas are affected by a contractive force.
Long corollas usually exclude short-billed hummingbirds, whereas short corollas permit access by long- and/or short-billed birds.
In fact, none of the 627 flowers used in our field experiments had holes in the base of the corolla.
These may also benefit the plant by preventing insects from damaging the corolla when robbing nectar.
The stamens have a rigid filament and a length that places the anthers beyond the tube of the corolla precisely under its upper lip.
Corolla-tube length (a), anther height (b), stigma height (c), corolla-lobe length (d), stigma-lobe length (e), and anther length (f) were measured.
This floral structure may act as a developmental constraint and generate positive anther- corolla correlations.
Two categories contained those flowers in which the corolla or perianth was at least partly fused into a tube.
Generally, long corollas exclude short-billed trochilids, whereas short corollas allow access for both long- and short-billed species.
Preferential nectar robbing of flowers with long corollas: experimental studies of two hummingbird species visiting three plant species.
Anther height and corolla-tube length showed the highest correlation coefficients (r > 0.9) for both morphs.
In general, another characteristic of this syndrome is rigidness of the corollas as an adaptation that minimizes possible damage caused by the pollinators upon extracting nectar.
Larvae bore into the ovary or corolla tube of disc or ray florets, moving from one floret to the next.
