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Variant of ocrea.


(ˈɒkrɪə) or


n, pl -reae (-rɪˌiː)
(Botany) a cup-shaped structure that sheathes the stems of certain plants, formed from united stipules or leaf bases
[C19: from Latin ocrea greave, legging, of obscure origin]
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It must be noted, however, that some characters that are typically found in the leaves of Polygonaceae, as ochrea at the base of the petiole, petiole with several vascular bundles, stomata usually present on both surfaces, vascular bundles of the veins accompanied by sclerenchyma, and 2-4 layers of palisade parenchyma (Metcalfe & Chalk, 1957), were not registered in cotyledons and eophylls of R.