In the flowers, corolla, corona and anther structure are similar, but the shape of the pollen tetrads in the two genera is different.
Ground-based telescopes observed a large increase in gases making up the comet's corona , including water vapour.
It is when the Sun is totally eclipsed that the solar corona is visible.
For the professional astronomers, the main subject of inquiry was the solar corona .
The style projects from the corona of anthers and elongates with age.
Contrast in spectral reflectance between the corona and corolla was evident only in Pachycarpus natalensis and Asclepias cucullata.
In most species, the head carries a corona of cilia that draws a vortex of water into the mouth, which the rotifer sifts for food.
As the brilliant Sun is covered by the Moon, the pearly corona flashes into view, the sky darkens, and all of nature seems to come to a halt.
Nectar is often visible at the base of the petals between the lobes of the corona .
A circle around the sun or moon that is smaller than a halo with a 22-degree radius, is probably a corona .