Envirothon 2025 - General Forestry Definitions

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20 Terms

1
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axil

the upper angle where a leaf stalk joins the stem or a smaller stem joins a larger one

<p>the upper angle where a leaf stalk joins the stem or a smaller stem joins a larger one</p>
2
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alternate

one leaf attached at each node

<p>one leaf attached at each node</p>
3
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bract

a leaf-like structure often attached beneath flowers

<p>a leaf-like structure often attached beneath flowers</p>
4
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capsule

a dry fruit which contains more than one seed and splits open when ripe

<p>a dry fruit which contains more than one seed and splits open when ripe</p>
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catkin

a compound bloom consisting of scaly bracts and flowers usually of one sex

<p>a compound bloom consisting of scaly bracts and flowers usually of one sex</p>
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deciduous

refers to trees which drop their leaves in autumn

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downy

with very short and weak soft hairs

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drupe

a type of fruit having a single seed enclosed in a hard layer and that covered with soft, often juicy flesh, as in cherries and peaches.

<p>a type of fruit having a single seed enclosed in a hard layer and that covered with soft, often juicy flesh, as in cherries and peaches.</p>
9
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evergreen

a plant that retains green leaves throughout the year. Life span of an individual leaf can be 2-15 years

10
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Leaflet

a leaf-like portion of the blade of a compound leaf. There is no bud in the axil of its peticle

<p>a leaf-like portion of the blade of a compound leaf. There is no bud in the axil of its peticle</p>
11
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leaf scar

the impression in a twig at the point where a leaf was attached

<p>the impression in a twig at the point where a leaf was attached </p>
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lenticel

a pore in the bark of young trunks and branches through which air passes to interior cells

<p>a pore in the bark of young trunks and branches through which air passes to interior cells</p>
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lobe

a division or projecting part of the blade of a leaf

14
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opposite

two leaves attached at each node

<p>two leaves attached at each node</p>
15
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pedicel

the stalk of a flower or inflorescence

<p>the stalk of a flower or inflorescence </p>
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petiole

the stalk attaching a leaf blade to the stem

<p>the stalk attaching a leaf blade to the stem</p>
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pith

the spongy material in the center of twigs and young trunks

<p>the spongy material in the center of twigs and young trunks</p>
18
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sessile

refers to a plant part having its base attached directly to the stem without an intervening stalk

<p>refers to a plant part having its base attached directly to the stem without an intervening stalk</p>
19
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stalked

refers to a leaf or flower having a length of petiole or pedicle between its base and the stem.

<p>refers to a leaf or flower having a length of petiole or pedicle between its base and the stem.</p>
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whorled

three or more leaves or other parts attached to a stem at the same point

<p>three or more leaves or other parts attached to a stem at the same point</p>