Costa's hummingbird (Calypte costae) foraging for nectar in the bright red tubular flowers of ocotillo (Fouquieria splendens). Pollen is displaced onto the beak and head of the bird as it inserts its long tongue into the corolla tube where the nectar is located.© Robert A. Tyrrell/Oxford Scientific Films 
The petals of the delicate flower of Campsis radicans (trumpet creeper, or trumpet vine) form a corolla tube with five spreading lobes. A shortened calyx tube covers the base of the flower.© Robert and Linda Mitchell 
Zygomorphy, or bilateral symmetry, of the viola (Viola), which produces a delicate five-petaled flower with two dissimilar pairs. Nectar guides are prominent on the lower spurred petal.(Top) © G.A. Maclean—Oxford Scientific Films (Bottom) E.S. Ross 
flower partsParts of a flower.Encyclopædia Britannica, Inc. 
Figure 13: Representative forms of the corolla.Encyclopædia Britannica, Inc.
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Assorted References
- plant reproduction
- In plant reproductive system: Angiosperms
…and the petals as the corolla; the calyx and corolla compose the perianth. If sepals or petals are lacking, the flower is said to be incomplete. Although incomplete, a flower that has both stamens and a pistil is said to be perfect; lacking either of these parts, it is imperfect.
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structure of
- angiosperms
- In angiosperm: The corolla
…the next floral whorl. The petals composing the corolla are typically brightly coloured or white and attract insects and birds for pollination (see below Reproduction: Pollination). The number of petals is usually the same as the number of sepals. Floral symmetry is defined by the petals (Figure 13).…
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- Asterales
- In Asterales: Asteraceae
…modified, mainly flat and elongate corolla that resembles an individual petal of most other flowers. Thus, the “petals” of a daisy or sunflower are actually the outermost flowers of the head. An inflorescence of this family can have more than 1,000 individual flowers (called florets), and the heads can be…
Read More - In Asterales: Campanulaceae
…which displays a brilliant red corolla, in contrast to the blue or white colours of the majority of related species. L. inflata (Indian tobacco) is native to eastern and central North America and has a tobacco taste; it was used as an emetic by Amerindians. This and other Lobelia species…
Read More - In Asterales: Other families
…and an inferior ovary. The corolla is often divided to the base on one side, and the petals have marginal wings that may make each look trilobed. Several herbaceous species of Scaevola are important ornamentals, especially as basket plants.
Read More - In Asterales: Other families
…outer layer of the tubular corolla is photosynthetic, the stamens are free, and the ovary is inferior. As with Asteraceae, the family has plunger pollination mechanisms and the ovary has two carpels, with only one ovule developing into a seed.
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- flowers
