Idaho OnePlan recommends the website of the Idaho Weed Awareness Campaign as the best resource for up-to-date information about Idaho's noxious weeds, and their control.
Source for this page: Idaho's Noxious Weeds by Robert H. Callihan & Timothy W. Miller

A  B  C  D  E  G  H  L  M  N  O  P  R  S  T  W 

Alternate
Leaves that are arranged singly up the stem; not opposite each other
Annual
Plant that germinates, flowers, seeds, and dies during one growing season
Annual
Plant that germinates, flowers, seeds, and dies during one growing season
Anther
Structure in a flower in which pollen is formed
Auricle
Lobelike structure at the collar of a grass leaf
Awn
Slender bristle at the tip of grass seed structure
Axil
The angle formed between a leaf and stem
Basal
At the base of plant or plant part
Biennial
Plant that germinates in one growing season, then flowers, seeds, and dies during a second
Bract
Leaflike structure at the base of flowers or leaves
Calyx
The outermost flower leaves (sepals) together, often green in color
Clasping Leaves
Leaves that appear to wrap around the stem at their base
Compound Leaves
Leaves with 2 or more distinct leaflets
Cotyledons
The first leaflike structures that appear after germination; seed leaves
Crown
The structure formed where leaves, stems, and roots grow together
Dissected
Deeply and repeatedly divided into smaller parts
Entire
Not toothed or otherwise cut
Glumes
The 2 bracts surrounding a grass spikelet
Head
A group of flowers borne tightly together
Leaflets
Leaflike structures within a compound leaf
Ligule
The structure at the collar of a grass leaf between the sheath and the stem
Linear
Long, narrow and slender
Lobed
A cut into a leaf from the edge toward the center; greater than toothed, but not quite compound
Margin
The edge of the leaf
Membranous
Thin and flexible, usually not green
Midrib
The center and usually most prominent vein on a leaf
Nodding
A flower that is not pointed upward, but bent downward or sidewise to the stem
Opposite
Leaves situated directly across the stem from each other
Ovate
Egg shaped in outline
Panicle
A much branched inflorescence
Perennial
Plant that lives for more than 2 growing seasons
Petiole
A leaf stalk
Pinnate
With 2 rows of leaflets, like a feather
Plume
A hairlike or featherlike structure, often on a seed
Pubescence
The hairs on a leaf, stem, or flower
Rhizome
A creeping, underground stem
Rosette
A circular, normally basal, clump of leaves
Sheath
The extension of leaf tissue surrounding a stem
Simple Leaf
One with a blade all in one piece; not compound
Spike
A narrow, nonspreading inflorescence
Spikelet
A single or group of floral structures in a grass
Spur
A hollow appendage on a flower
Stolon
A creeping stem along the surface of the ground
Succulent
Fleshy and juicy
Taproot
A thick, central root with minimal branching
Trifoliate
A leaf made of 3 leaflets; cloverlike
Whorled
3 or more similar structures arranged as spokes on a wheel

A  B  C  D  E  G  H  L  M  N  O  P  R  S  T  W