sepal

By mutating genes that control polyploidy in the mustardlike plant Arabidopsis thaliana, she and her team discovered that if the sepal had too few polyploid cells, it was stiff and upright and blooming was impeded.

From Science Magazine ● Aug. 23, 2023

Goethe recognized that all the parts of a flower, from pistil to sepal, are modified leaves.

From Nature ● Aug. 5, 2019

Flowers diœcious; the sterile racemed or panicled; the fertile in clusters or catkins, the calyx of one sepal embracing the ovary.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Asa Gray

Stems hairy, creeping at base; leaves ovate, clasping, entire, basally nerved; peduncles shorter than the calyx; upper sepal heart-shaped; corolla blue.—Margin of pine-barren ponds, N. J. and Md. to La.—Aromatic when bruised.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Asa Gray

Edithae.—Rosy white of sepal and petal, bordered with yellow and barred with chestnut; lip pale yellow, much deeper at the base, with chestnut spots in the centre.

From The Woodlands Orchids by Frederick Boyle