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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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