oc·re·a or och·re·a 
(ŏkrē-ə)
(ŏkrē-ə)n. pl. oc·re·ae (-rē-ē′) or och·re·ae
A sheath formed at the node of a stem by the fusion of two stipules, found in many plants of the family Polygonaceae, such as rhubarb.
[Latin, greave.]
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