A BWCA Glossary


Umbel
An arrangement of flowers springing from a common center and forming a flat or rounded cluster. Striking examples of North Country plants bearing their flowers in umbels would include Joe Pye Weed (Eupatorium maculatum) and Cow Parsnip (Heracleum lantana). From the Latin, umbella, diminutive of umbra, "shade."
Umbellate
A plant or plant stucture bearing umbels, consisting of umbels, or forming an umbel.
Uncommon
To birders and ornithologists, a bird species which might be seen in a given locale at levels of no more than five birds daily; 5 to 25 times over the course of a season by an active observer. Somewhat less commonly occurring species are termed Rare.
Underbrush
The shrub and tall herb layer under a forest canopy.
Understory
The foliage layer beneath the forest canopy, composed of young trees that are growing beneath the taller mature trees and the large shrubs.
Upland
A land zone sufficiently above or away from freshwater bodies, the water table, and streams to be largely dependent on precipitation for its water supplies.
Uredial Stage
A stage of the rust fungi (uredium) where a fruiting structure usually appears as a pustule bearing the repeating spore stage that leads to disease increase.

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USFS
United States Forest Service, the federal agency charged with the management of the Superior National Forest, home to the Boundary Waters Canoe Area Wilderness.
USGS
United States Geological Survey, the federal government's mapmaker and the source for the topographical map data which underlies the maps of Fisher, McKenzie, and TOPO!.
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Last Updated on 11 April, 2004