Artemisia carruthii Wood ex Carruth

Carruth's wormwood

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New England Distribution

Adapted from BONAP data

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North America Distribution

Adapted from BONAP data

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Facts About

In New England, Carruth's wormwood is an occasional invader only in Rhode Island. However, it is native to the southwestern United States, where the Navajo used the ground seeds to make a type of bread.

Habitat

Anthropogenic (man-made or disturbed habitats), meadows and fields

Characteristics

Habitat
terrestrial
New England state
Rhode Island
Leaf type
leaves are simple (i.e., lobed or unlobed but not separated into leaflets)
Leaf arrangement
alternate: there is one leaf per node along the stem
Leaf blade edges
the edge of the leaf blade has lobes, or it has both teeth and lobes
Flower type in flower heads
the flower head has disk flowers only, and lacks the strap-shaped flowers
Ray flower color
NA
Tuft or plume on fruit
  • NA
  • there is no plume, or the plume is made up of scales, awns, a crown, or a rim
Spines on plant
the plant has no spines
Leaf blade length
1–30 mm
Flower head width
1.5–3 mm
Disk flower number
  • 11-20
  • 21-50
  • 6-10
Show All Characteristics
  • Flowers
    Bract color
    the bracts are not colored or tinged with pink, red or purple
    Bract cycle number
    there are three or more cycles of bracts
    Bract outer side hair type
    the bracts are hairy on their outer surfaces, with curled, tangled, matted, or woolly hairs
    Bract outer side hairs
    the bracts are hairy on their outer surfaces
    Bract separation
    the bracts appear completely unconnected to one another on all flower heads
    Bract shape
    the main bracts are lanceolate (widest above the base, then taper narrowly towards the tip)
    Bract spines
    the bracts have no spines
    Bract tip color
    the tips are a different color from the center of the bract
    Bracts
    there are at least two distinct forms of bracts in different cycles
    Disk flower color
    yellow
    Disk flower lobe number
    5
    Disk flower number
    • 11-20
    • 21-50
    • 6-10
    Disk flower reproductive parts
    • the disk flower has both pollen- and seed-producing parts
    • the disk flower has either only pollen- or only seed-producing parts
    Disk flower shape
    the disk flower is tube-shaped (cylindrical), or gradually widening like a funnel
    Flower head number
    each flowering stem has four or more flower heads on it
    Flower head outer flowers
    at the outer edge of the flower head, the flowers have no enlarged lobe or strap, and are of similar size as those in the center of the disk
    Flower head platform
    the base has no bristles or papery scales
    Flower head platform surface
    NA
    Flower head position
    some or all the flower heads are grouped in clusters of two or more
    Flower head profile
    • the disk is flat or nearly flat across the top
    • the disk is rounded across the top
    Flower head shape
    the sides of the flower head are roughly parallel, like a cylinder
    Flower head width
    1.5–3 mm
    Flower type in flower heads
    the flower head has disk flowers only, and lacks the strap-shaped flowers
    Height of flower head base
    2.5–4.5 mm
    Inflorescence branching (Solidago)
    NA
    Inflorescence shape
    the inflorescence is not flat-topped but appears rounded, with some flower heads distinctly higher than others
    Number of bracts at flower head base
    2–20
    Ovary attachment
    the ovary is attached at or near the base
    Ovary cross-section
    the ovary has five or more corners in cross-section
    Ovary hair type
    the ovary has no hairs on it
    Ovary hairs
    the ovary has no hairs on it
    Ovary profile
    in profile, the ovary is oblong (roughly rectangular but rounded at the ends)
    Peduncle length
    2–5 mm
    Ray flower color
    NA
    Ray flower reproductive parts
    the ray flowers have carpels or stamens, but not both
    Ray flowers
    1-5
    Ray length
    0 mm
    Reproductive system
    some of the flowers on the plant have only carpels or stamens, while others have both carpels and stamens
    Scale tip
    NA
    Style branch number
    the style has two branches
    Style branches
    the style branch is wider at the tip and has a flattened end, or the style branches are wider at the tips and have flattened ends
    Width of flower head base
    1.5–3 mm
  • Fruits or seeds
    Number of pappus parts
    NA
    Ovary length in developed fruit
    Up to 0.5 mm
    Seed hair tuft bases
    NA
    Seed hair tuft color
    NA
    Seed hair tuft details
    NA
    Seed hair tuft length
    0 mm
    Seed hair tuft tips
    NA
    Seed hairs uniform
    NA
    Seed tuft scale number
    0
    Seed tuft type
    there is no pappus on the ovary
    Top of disk flower ovary
    NA
    Tuft or plume on fruit
    • NA
    • there is no plume, or the plume is made up of scales, awns, a crown, or a rim
  • Glands or sap
    Ovary glands
    • there are glands on the ovary surface
    • there are no visible glands on the ovary
    Sap
    the sap is clear and watery
  • Growth form
    Growth form
    the plant has one or more free-standing stems
    Horizontal rooting stem
    there are stolons on some plants
    Plant lifespan
    the plant is perennial, it shows evidence of previous year's leaves, stems or stem bases
    Spines on plant
    the plant has no spines
    Underground organs
    the plant has a rhizome (a horizontal underground stem with roots growing from it)
  • Leaves
    Final leaf segment length (compound lvs only)
    3–10 mm
    Final leaf segment width (compound lvs only)
    0.5–1 mm
    Hairs on underside of leaf blade
    • the underside of the leaf is fuzzy or hairy
    • the underside of the leaf is not hairy, or has very few hairs
    Hairs on upper side of leaf blade
    the upper side of the leaf is not hairy, or has very few hairs
    Leaf arrangement
    alternate: there is one leaf per node along the stem
    Leaf blade base
    • the leaf has a distinct petiole
    • the leaf has no petiole
    Leaf blade base shape
    the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
    Leaf blade bloom
    NA
    Leaf blade edges
    the edge of the leaf blade has lobes, or it has both teeth and lobes
    Leaf blade hairs
    the leaf blade has tangled or woolly-looking hairs
    Leaf blade length
    1–30 mm
    Leaf blade shape
    the leaf blade is elliptic (widest near the middle and tapering at both ends)
    Leaf blade width
    5–10 mm
    Leaf disposition
    the leaves are nearly similar in size, prominence of teeth, and length of stalks throughout the stem
    Leaf spines
    there are no spines on the leaf edges
    Leaf tip extension
    NA
    Leaf type
    leaves are simple (i.e., lobed or unlobed but not separated into leaflets)
    Specific leaf type
    • the leaf has a row of two or more lobes on each side of the central axis
    • the leaf has a row of two or more lobes on each side of the central axis, and each lobe itself has rows of lobes on each side of the lobe's central axis
  • Place
    Habitat
    terrestrial
    New England state
    Rhode Island
    Specific habitat
    • man-made or disturbed habitats
    • meadows or fields
  • Scent
    Plant odor
    • the plant does not have much of an odor
    • the plant has a pleasant odor, such as licorice, fruit or resin
  • Stem, shoot, branch
    Flowering stem cross-section
    the flowering stem is circular, or with lots of small angles
    Leaves on stem
    there is at least one full leaf above the base of the flowering stem
    Stem internode hair direction
    the hairs point mostly upwards to outwards
    Stem internode hair type
    at least some of the hairs on the stem are tangled, matted or woolly
    Stem internode hairs
    the stem has hairs between the nodes

Wetland Status

Not classified

New England Distribution and Conservation Status

Distribution

Connecticut
absent
Maine
absent
Massachusetts
absent
New Hampshire
absent
Rhode Island
present
Vermont
absent

Conservation Status

None

Native to North America?

Yes

Sometimes Confused With

Artemisia vulgaris:
leaf blades with ultimate segments wider than 2 mm and reproductive stems mostly 6-19 dm tall (vs. A. carruthii, with leaf blades with ultimate segments narrower than 2 mm and reproductive stems mostly 1.5-4 dm tall).

Synonyms

  • Artemisia carruthii Wood ex Carruth var. wrightii (Gray) Blake
  • Artemisia kansana Britt.
  • Artemisia vulgaris L. ssp. wrightii (Gray) Hall & Clements

Family

Asteraceae

Genus

Artemisia

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Information from Dichotomous Key of Flora Novae Angliae

6.  Artemisia carruthii Wood ex Carruth E

Carruth’s wormwood. Artemisia carruthii Wood ex Carruth var. wrightii (Gray) Blake; A. kansana Britt.; A. vulgaris L. ssp. wrightii (Gray) Hall & Clements • RI. Roadsides, fields, waste areas.