
A corymb is similar to a panicle with the same branching structure, but with the lower flowers having longer stems, thus creating a flatter top.
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From the category archives:

A corymb is similar to a panicle with the same branching structure, but with the lower flowers having longer stems, thus creating a flatter top.
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Habit – The growth form of a plant, comprising its size, shape, texture and orientation.
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The pollen-bearing organ of a flower, each stamen consisting of a filament (stem) and anther which contains the pollen.
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pet·i·ole [pet-ee-ohl]
The stalk of a leaf, attaching the blade to the stem.
Swiss Chard – Petiole source: eflon (Flickr)
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Female reproductive structure of a flower, composed of an ovule-containing ovary at the base, one or more pollen-receiving stigmas at the tip.

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The mark left on the twig at the point of attachment of a leaf petiole when the leaf falls.

Tree of Heaven (Ailanthus altissima) – Leaf Scar
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gla·brous (glā’brəs)
Smooth without hairiness or roughness.

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lan·ce·o·late (lăn’sē-ə-lāt’)
Lance-shaped, broadest above the base, gradually narrowing to the apex.

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fer·tile (fûr’tl)
Capable of producing fruit; or productive, as a flower having a pistil or an anther having pollen.

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Pinnately compound leaves have the leaflets arranged along the main or mid-vein.
image source, Flicker user: chefranden
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