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

Parts of same, two of each kind, separated and displayed; the torus or receptacle in the centre; a, a sepal; b, a petal; c, a stamen; d, a pistil.

From The Elements of Botany For Beginners and For Schools by Asa Gray

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

The vascular bundles sometimes form a prominent rib, which indicates the middle of the sepal; at other times they form several ribs.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various