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