sepal


Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.

sepal

a modified leaf (usually green) forming part of the CALYX of the flower of a DICOTYLEDON, which often protects the flower while in bud but which can be modified for other functions; for example in the dandelion it forms the seed parachute.
References in periodicals archive ?
The most peculiar characters of this taxon are located in the flowers, which are strongly zygomorphic with an urceolate and markedly bilateral calyx; sepals are light yellow (lower altitude populations) or purple (higher altitude populations); there are existing populations that show yellow-purplish sepals as an intermediate character; the adaxial sepals are larger than the abaxial; the abaxial are suborbicular to broadly ovate-cordate, forming a distinctive banner like hood, keeled, 4-6 x 6-8 mm; petals are subincluded or barely exserted, purplish or brownish, especially on the veins.
SEM specimen mounting glue or the adhesive from double-side mounting tape was placed onto the tip of a forcep, and this sticky forcep tip was then used to pull bracteoles, sepals, or petals of the flower bud with greater precision than was possible without the adhesive method.
The CIE L and a values of the floret parts at FB, including the petals, dorsal sepals, laterals sepals, and lips, from the two Vanda hybrids (Fig.
However, they may be perfect, yet lack sepals or petals, or both.
While most cultivated upland cottons are free of gossypol glands on the sepal margin (a phenotype referred to herein as NG), cultivars expressing the HG phenotype (gossypol glands present on sepal margins) have been developed (Calhoun et al., 1997).
rugosa, petal volatiles are dominated by terpenoid and benzenoid alcohols, sepal volatiles are dominated by sesquiterpenes, and pollen and anther volatiles are dominated by fatty acid derivatives.
involucrata each produce two white, or pinkish, petaloid sepals. Sepal width is not significantly different between the sexes (mean [+ or -] SD: 13.3 [+ or -] 1.41 mm, male; 12.9 [+ or -] 1.33 mm, female), although the sepals of male flowers are significantly longer than those of female flowers (13.2 [+ or -] 1.32 mm, male; 10.9 [+ or -] 1.30 mm, female) (Agren and Schemske 1991).
Aspicarpa steinmannii is immediately shown to belong in the Aspicarpa/ Gaudichaudia complex by the following characters: leaves eglandular except for the tiny tail-like marginal outgrowths near the base of the lamina of some leaves; stamens five, opposite sepals; gynoecium with a single style, the stigma terminal and capitate; samaras with well-developed lateral wings; each samara attached to the receptacle by a cartilaginous carpophore.
The contributions of each component to sepal and petal shape variations are shown in (Tables I and II).