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Obcordate
Referring to a heart-shaped leaf, where the stalk (petiole) is attached to the point of the heart.
Oblong-orbiculate
An oblong-shaped leaf that's almost as long as it is wide, and has a round appearance.
Oedema
A physiological condition resulting from the build-up of moisture. Symptoms are brown, corky spots on leaves. It isn't contagious, but it's often mistaken for galls.
Offset
A shoot or plantlet produced at the base of a mature plant, which may be used for propagation.
Pagination for glossary terms starting with the letter "o"
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