Coreopsis palmata Nutt.

stiff tickseed

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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

Stiff tickseed is native to the Great Plains and parts of the Midwest and South, but it is not native to New England, and has only been collected in Massachusetts. Its opposite, basal leaves are divided into three to five narrow lobes, and it has large, striking yellow flowers.

Habitat

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

Characteristics

Habitat
terrestrial
New England state
Massachusetts
Leaf type
leaves are simple (i.e., lobed or unlobed but not separated into leaflets)
Leaf arrangement
opposite: there are two leaves per node along the stem
Leaf blade edges
  • the edge of the leaf blade has lobes, or it has both teeth and lobes
  • the edge of the leaf blade has no teeth or lobes
Flower type in flower heads
the flower head has tubular disk flowers in the center and ray flowers, these often strap-shaped, around the periphery
Ray flower color
yellow
Tuft or plume on fruit
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
5–40 mm
Flower head width
38–75 mm
Disk flower number
more than 50
Show All Characteristics
  • Flowers
    Bract cycle number
    there are two main cycles of bracts
    Bract inner side hairs
    the bracts are not hairy on their inner surfaces
    Bract outer side hair type
    the bracts are not hairy on their outer surface
    Bract outer side hairs
    the bracts are not hairy on their outer surfaces
    Bract separation
    • at least some flower heads have bracts connected to one another at or near their bases
    • 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)
    • the main bracts are oblong (roughly rectangular but rounded at the ends)
    • the main bracts are orbicular (roughly circular)
    Bract spines
    the bracts have no spines
    Bract texture
    • the bracts appear thin, flexible and nearly translucent
    • the bracts have a similar texture to a leaf
    Bract tip orientation
    the bracts are pressed against the plant, or spreading out at the tips
    Bract tip shape
    • the tips of the bracts acute (have a sharp point)
    • the tips of the bracts are rounded
    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
    more than 50
    Disk flower reproductive parts
    the disk flower has both pollen- and seed-producing parts
    Disk flower shape
    the disk flower is tube-shaped (cylindrical), or gradually widening like a funnel
    Disk width
    8–15 mm
    Flower head number
    each flowering stem has only one to three flower heads on it
    Flower head outer flowers
    at the outer edge of the flower head, each flower has a single enlarged lobe or strap
    Flower head platform
    the base has papery scales on it
    Flower head platform surface
    the scales are smooth, no visible hairs
    Flower head position
    each of the flower heads is separate on its own peduncle (stalk), not clustered in groups
    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
    38–75 mm
    Flower type in flower heads
    the flower head has tubular disk flowers in the center and ray flowers, these often strap-shaped, around the periphery
    Height of flower head base
    6–10 mm
    Inflorescence branching (Solidago)
    NA
    Inflorescence shape
    NA
    Inflorescence stem
    the stem of the inflorescence is not hairy
    Number of bracts at flower head base
    17–20
    Ovary cross-section
    the ovary is compressed (flattened)
    Ovary profile
    in profile, the ovary is oblong (roughly rectangular but rounded at the ends)
    Ovary wing number
    1-2
    Peduncle hair type
    NA
    Peduncle hairs
    the peduncles have no hairs
    Peduncle length
    10–40 mm
    Ray flower color
    yellow
    Ray flower reproductive parts
    • the ray flowers have carpels or stamens, but not both
    • there are neither carpels nor stamens in the ray flowers
    Ray flowers
    • 1-5
    • 11-15
    • 6-10
    Ray length
    15–25 mm
    Reproductive system
    • all the flowers on the plant contain both carpels and stamens
    • some of the flowers on the plant have only carpels or stamens, while others have both carpels and stamens
    Scale tip
    • the scales are acute (sharply pointed) at the top
    • the scales are rounded at the top
    Smaller bracts at base of bracts
    there is a cycle of much smaller bracts outside the cycle of larger and longer bracts
    Style branch number
    the style has two branches
    Style branches
    the style branch is narrow at the tip, or the style branches are narrow at the tips
    Width of flower head base
    4–25 mm
  • Fruits or seeds
    Number of pappus parts
    • 0
    • 2
    Ovary length in developed fruit
    4.5–6.5 mm
    Ovary width in developed fruit
    1.8–4 mm
    Seed hair tuft bases
    NA
    Seed hair tuft color
    NA
    Seed hair tuft details
    NA
    Seed hair tuft length
    At least 0 mm
    Seed hair tuft tips
    NA
    Seed hairs uniform
    NA
    Seed tuft scale number
    0–2
    Seed tuft type
    • the pappus is made of flat scales that are not split or frayed at the tips
    • there is no pappus on the ovary
    Top of disk flower ovary
    NA
    Tuft or plume on fruit
    there is no plume, or the plume is made up of scales, awns, a crown, or a rim
  • Glands or sap
    Sap
    the sap is clear and watery
  • Growth form
    Growth form
    the plant has one or more free-standing stems
    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 width (compound lvs only)
    2–7 mm
    Hairs on underside of leaf blade
    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
    opposite: there are two leaves per node along the stem
    Leaf blade base
    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 edges
    • the edge of the leaf blade has lobes, or it has both teeth and lobes
    • the edge of the leaf blade has no teeth or lobes
    Leaf blade hairs
    NA
    Leaf blade length
    5–40 mm
    Leaf blade shape
    • the leaf blade is linear (very narrow with more or less parallel sides)
    • the leaf blade is oblong (rectangular but with rounded ends)
    Leaf blade surface colors
    there is no noticeable color variation on the upper surface of the leaf
    Leaf blade tip
    • the tip of the leaf blade is acute (sharply pointed)
    • the tip of the leaf blade is obtuse (bluntly pointed)
    Leaf blade veins
    the leaf blade has one main vein running from the base towards the tip
    Leaf blade width
    2–7 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 stalk
    the leaves have no leaf stalks, but attach directly to the stem
    Leaf stalk length
    0–1 mm
    Leaf tip extension
    NA
    Leaf type
    leaves are simple (i.e., lobed or unlobed but not separated into leaflets)
    Leaflet number
    3–5
    Specific leaf type
    • the leaf has lobes that radiate from the base, somewhat like a hand
    • the leaves are simple (i.e., lobed or unlobed but not separated into leaflets
  • Place
    Habitat
    terrestrial
    New England state
    Massachusetts
    Specific habitat
    • man-made or disturbed habitats
    • meadows or fields
  • Stem, shoot, branch
    Leaves on stem
    there is at least one full leaf above the base of the flowering stem
    Stem internode hair direction
    NA
    Stem internode hair length
    0 mm
    Stem internode hair type
    the stem has no hairs between the nodes
    Stem internode hairs
    the stem has no hairs between the nodes

Wetland Status

Not classified

New England Distribution and Conservation Status

Distribution

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

Conservation Status

None

Native to North America?

Yes and no (some introduced)

Sometimes Confused With

Coreopsis tripteris:
leaf blades borne on evident, narrow petioles that are clearly much narrower than the associated leaf lobes, outer involucral bracts 2-3 mm long, approximately 1/3 to 1/2 as long as the inner bracts, and reproductive stems 1-3 m tall (vs. C. palmata, with leaf blades sessile, though appearing to be borne on a broadly winged petiole of +/- similar width to the lateral lobes, outer involucral bracts 6-10 mm long, subequal in length to the inner bracts, and reproductive stems 0.3-1 m tall).
Coreopsis major:
leaf blades trifurcating at the base, therefore the leaf blades definitely appearing sessile, with lanceolate to oval lobes mostly 12–25 mm wide, and internodes of stem usually short-pubescent (vs. C. palmata, with leaf blades trifurcating well above the base, therefore the blades appearing to be on a broadly winged petiole, with linear to narrow-oblong lobes 2–7 mm wide, and internodes of stem usually glabrous).

Family

Asteraceae

Genus

Coreopsis

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Information from Dichotomous Key of Flora Novae Angliae

5.  Coreopsis palmata Nutt. E

stiff tickseed. MA. Railroads, fields, roadsides.