Biology Of Plants Practicum Terms

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A seed-producing annual, biennial, or perennial that does not develop persistent woody tissue, but dies down at the end of a growing season. May be valued for its medicinal, savory, or aromatic qualities.
Herb
A perennial, low, woody plant with several stems arising from or near the ground.
Shrub
A woody perennial plant having a single usually elongated main stem (trunk), generally with few or no branches on its lower part.
Tree
Narrow-leaved herb with jointed stems and spike-like flowers.
Grass
Non-vascular plant without true roots (rhizoids) and without vascular tissue. Haploid generation is dominant.
Moss
Vascular plant with true roots. Diploid generation is dominant. Leaves are fronds emerging with fiddleheads. Reproduces with spores.
Fern
A plant growing on another plant without deriving direct nutrition from host plant.
Epiphyte. Epi-upon. Phyte-plant.
A plant with long, slender, weak stems that are unable to support their own weight and are supported by other plants or trail on the ground - "hebaceous" or woody.
Vine
A woody vine supported by other plants.
Liana
A plant that obtains nutrients from another plant (host). The association is beneficial to the plant, but harmful to the host.
Parasite
A parasite completely dependant on the host.
Holoparasite
A parasite that obtains nutrients and water from the host, but is photosynthetic.
Hemiparasite
Having the characteristics of an herb. Stems have little or no woody tissue and persist usually for a single growing season.
Herbaceous
Having persistent stems containing wood, i.e. secondary growth via an active vascular cambium.
Woody
An hebaceous plant that grows from seed, reproduces then dies in one growing season.
Annual
A plant capable of growing for more than one season.
Perennial
A plant present or presumed to have been present in an area prior to the beginning of recorded history - not introduced by man.
Native
A plant intentionally or accidentally introduced by man outside of its native range.
Exotic
A species that invades natural communities, displaces native species, and alters ecological processes.

Invasive
Foliage remains green and functional through more than one growing season.
Evergreen
Looses leaves in a season.
Deciduous
A type of leaf complexity. Leaf with single blade.
Simple
A type of leaf complexity. Leaf with more than one blade/petiole.
Compound
A type of leaf arrangement. One leaf at each node.
Alternate
A type of leaf arrangement. One leaf on each side of the stem at a node.
Opposite
A type of leaf arrangement. More than two leaves at one node.
Whorled
A leaf margin characteristic. Leaf has smooth, unbroken outline with no teeth.
Entire. Other leaf margins include: serrated (teeth), doubly serrated (teeth on teeth), and incised (curved and pointed sections)
The outside edge of a leaf.
Margin
The stem like part of a leaf that attaches the blade to the actual stem.
Petiole
The place where the leaf attaches to the stem.
Node