Glossary

alluvial fan: a spreading, sloping mass of silt and rocks deposited by a stream where it leaves the mouth of a narrow valley.

balsam: a group of fragrant substances produced by some trees.

leaf scar: a raised area on a twig where a leaf was attached at some earlier time. Some twigs, like on cottonwood trees, appear as "stacks" of leaf scars.

lenticel: a structure in bark that permits gas exchange between inside the tree and the air outside.

pioneer: a type of plant that spreads quickly over distances, often by wind-dispersed seeds, and colonizes disturbed areas such as along road sides or where glaciers have been.

resin: a yellow sticky substance exuded from some trees.

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This page last updated June 4, 2006