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Native Plant Trust: Go Botany Discover thousands of New England plants

Rubus elegantulus — showy blackberry

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Facts

Showy blackberry closely resembles its close relative, smooth blackberry, but its stems have more prickles, and its range is confined to New England, northeastern Canada, and Wisconsin. Birds and other animals eat the berries.

Habitat

Anthropogenic (man-made or disturbed habitats), forest edges, marshes, meadows and fields, ridges or ledges, shores of rivers or lakes, shrublands or thickets, wetland margins (edges of wetlands)

New England distribution

Adapted from BONAP data

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North America distribution

Adapted from BONAP data

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Characteristics

Habitat
  • terrestrial
  • wetlands
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Vermont
Growth form
the plant is a shrub (i.e., a woody plant with several stems growing from the base)
Leaf type
the leaf blade is compound (i.e., made up of two or more discrete leaflets
Leaves per node
there is one leaf per node along the stem
Leaf blade edges
the edge of the leaf blade has teeth
Leaf duration
the leaves drop off in winter (or they wither but persist on the plant)
armature on plant
the plant has spines, prickles, or thorns
Leaf blade length
110–220 mm
Leaf blade width
110–220 mm
Leaf stalk
the leaves have leaf stalks
Fruit type (general)
the fruit is fleshy
Bark texture
the bark of an adult plant is thin and smooth
Twig winter color
brown
Bud scale number
there are three or more scales on the winter bud, and they overlap like shingles, with one edge covered and the other edge exposed
Show all characteristics

  • Buds or leaf scars

    Bud scale number
    there are three or more scales on the winter bud, and they overlap like shingles, with one edge covered and the other edge exposed
    Bud scar shape (Fraxinus)
    NA
    Collateral buds
    there are no collateral buds on the sides of the branches
    Leaf scar arrangement
    there is one leaf scar per node on the stem or twig
    Superposed buds
    there are no superposed buds on the branch
    Winter bud stalks
    the winter buds have no stalks

  • Flowers

    Carpels fused
    • the carpel is solitary or (if 2 or more) the carpels are not fused to one another
    • the carpels are fused to one another
    Enlarged sterile flowers
    there are no enlarged sterile flowers on the plant
    Flower petal color
    white
    Flower symmetry
    there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
    Hairs on ovary (Amelanchier)
    NA
    Hypanthium present
    the flower has a hypanthium
    Inflorescence hairs
    • there are hairs on some part of the inflorescence
    • there are no hairs on the inflorescence
    Inflorescence type
    the inflorescence is a raceme (a long unbranched stem with stalked flowers growing along it)
    Number of pistils
    6 or more
    Ovary position
    the ovary is above the point of petal and/or sepal attachment
    Petal and sepal arrangement
    the flower includes two cycles of petal- or sepal-like structures
    Petal appearance
    the petals are thin and delicate, and pigmented (colored other than green or brown)
    Petal fusion
    the perianth parts are separate
    Sepal appearance
    the sepals resemble leaves in color and texture
    Sepal cilia (Ilex)
    NA
    Sepal tip glands
    there are no glands at the tips of the sepal lobes
    Sepals fused only to sepals
    the sepals are separate from one another
    Stamen number
    13 or more
    Stamens fused
    the stamens are not fused to one another

  • Fruits or seeds

    Berry color
    • NA
    • black
    Fruit tissue origin
    there are no flower parts that form part of the fruit
    Fruit type (general)
    the fruit is fleshy
    Fruit type (specific)
    • the fruit is a berry (fleshy, with the wall enclosing one or more sections, with two or more seeds)
    • the fruit is a drupe (fleshy, with a firm inner ovary wall that encloses a single seed)
    • the fruit is an aggregate (composed of multiple fused ovaries from one flower)
    Nut with spines (Fagaceae)
    NA
    Wings on fruit
    there are no wings on the fruit

  • Glands or sap

    Sap color
    the sap is clear and watery
    Stalked glands on fruit (Rosa)
    NA

  • Growth form

    Growth form
    the plant is a shrub (i.e., a woody plant with several stems growing from the base)

  • Leaves

    Hairs on underside of leaf blade
    • the underside of the leaf has hairs on it
    • the underside of the leaf has no hairs
    Hairs on upper side of leaf blade
    the upper side of the leaf is not hairy, or has very few hairs
    Leaf blade base shape
    • The base of the leaf blade is cordate (heart-shaped, with rounded lobes)
    • the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
    • the base of the leaf blade is rounded
    Leaf blade base symmetry
    the leaf blade base is symmetrical
    Leaf blade bloom
    the underside of the leaf has no noticeable bloom
    Leaf blade edges
    the edge of the leaf blade has teeth
    Leaf blade edges (Acer)
    NA
    Leaf blade flatness
    the leaf is flat (planar) at the edges
    Leaf blade hairs
    NA
    Leaf blade length
    110–220 mm
    Leaf blade scales
    there are no scales on the leaf blades
    Leaf blade shape
    • the leaf blade is elliptic (widest near the middle and tapering at both ends)
    • the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
    • the leaf blade is ovate (widest below the middle and broadly tapering at both ends)
    Leaf blade texture
    • the leaf blade is chartaceous (thin and dry like paper)
    • the leaf blade is herbaceous (has a leafy texture)
    Leaf blade translucent dots
    there are no translucent dots on the leaf blade
    Leaf blade vein pattern
    the main veins of the leaf blade are pinnate (the secondary veins branch off at intervals from the main central vein) and non-arcuate (not arched towards the leaf tip)
    Leaf blade veins
    the leaf blade has one main vein running from the base toward the tip
    Leaf blade width
    110–220 mm
    Leaf duration
    the leaves drop off in winter (or they wither but persist on the plant)
    Leaf form
    the plant is broad-leaved (with broadly flattened leaf blades)
    Leaf lobe tips (Quercus)
    NA
    Leaf midrib glands
    the midrib of the leaf blade lacks glands on the upper surface
    Leaf stalk
    the leaves have leaf stalks
    Leaf stalk attachment to leaf
    the petiole attaches at the basal margin of the leaf blade
    Leaf stalk nectaries
    there are no nectaries on the leaf stalk
    Leaf stalk shape
    the leaf stalk is not flattened
    Leaf teeth
    • the leaf blade margin has teeth, which themselves have smaller teeth on them
    • the leaf blade margin is serrate (with forward-pointing) or dentate (with outward-pointing) with medium-sized to coarse teeth
    Leaf teeth hairs (Carya)
    NA
    Leaf type
    the leaf blade is compound (i.e., made up of two or more discrete leaflets
    Leaves per node
    there is one leaf per node along the stem
    Specific leaf type
    • the leaf is compound, with three leaflets
    • the leaf is palmately compound with more than three leaflets
    Stipules
    the plant has stipules

  • Place

    Habitat
    • terrestrial
    • wetlands
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • New Hampshire
    • Vermont
    Specific habitat
    • edges of forests
    • edges of wetlands
    • man-made or disturbed habitats
    • marshes
    • meadows or fields
    • ridges or ledges
    • shores of rivers or lakes
    • shrublands or thickets

  • Scent

    Plant odor
    the plant does not have much of an odor, or it has an unpleasant or repellant odor

  • Stem, shoot, branch

    Aerial roots
    the plant has no aerial roots
    Bark texture
    the bark of an adult plant is thin and smooth
    Branch brittleness (willows only)
    NA
    Branch cross-section
    the branch is circular in cross-section, or it has five or more sides, so that there are no sharp angles
    First-year cane (Rubus)
    the first year cane stems are upright or arching
    Lenticels on twigs
    there are no lenticels on the twigs, or they are very hard to see
    Pith shape
    the outline of the pith in a twig is roughly round
    Short shoots
    there are no peg- or knob-like shoots present
    Twig bloom
    there is no bloom on the twig
    Twig papillae (Vaccinium species only)
    NA
    Twig scales
    there are no scales on the twig surface
    Twig winter color
    brown
    Wings on branch
    the branch does not have wings on it
    armature on plant
    the plant has spines, prickles, or thorns

Wetland status

Not classified

In New England

Distribution

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

Conservation status

Exact status definitions can vary from state to state. For details, please check with your state.

Massachusetts
historical (S-rank: SH), H (code: H)

From Flora Novae Angliae dichotomous key

10.  Rubus elegantulus Blanch. N

showy blackberry. Rubus amicalis Blanch.; R. kennedyanus Fern.; R. multiformis Blanch. • CT, MA, ME, NH, VT. Fields, roadsides, forest borders and clearings, wetland margins, graminoid marshes, seeps, stream banks, bases of ledges, open rights-of-way, sometimes ascending to boreal settings.

1×10. Rubus allegheniensis × Rubus elegantulus → This very rare blackberry hybrid is known from NH. It has leaves that generally resemble Rubus allegheniensis and are pubescent on the abaxial surface, with stems bearing thinner prickles than found in that species (but as in R. elegantulus), and an inflorescence axis bearing stipitate-glands.

5×10. Rubus canadensis × Rubus elegantulus → This very rare blackberry hybrid is likely more common than is currently vouchered. It is known from NH. Due to the close morphological similarity of the parental species, knowledge of both species present at a given site is very useful information for detecting most occurrences.

10×17. Rubus elegantulus × Rubus jaysmithii → This very rare blackberry hybrid is known from VT. It resembles hybrids between Rubus elegantulus and R. recurvicaulis (10 ×25) except that the leaf blades are pubescent abaxially.

10×25. Rubus elegantulus × Rubus recurvicaulis → This rare blackberry hybrid is known from ME, VT. It is marked by stout primocanes that arch, dome, or trail, large leaflets that are glabrous on the abaxial surface, relatively thin prickles, and inflorescences similar to Rubus elegantulus but without stipitate-glands along the axis.

10×27. Rubus elegantulus × Rubus setosus → This rare blackberry hybrid is known from ME, NH. It is marked by doming to arching habit, stems armed with sparse to abundant thin prickles and bristles (stipitate-glands are usually also present), and leaves with ovate to lanceolate leaflets. It is very similar to Rubus setosus ×R. vermontanus and is best separated from that hybrid by examining the parental species at the site.

10×28. Rubus elegantulus × Rubus vermontanus → This very rare blackberry hybrid is known from ME, NH. It is very difficult to detect due to the close morphological similarity of the two parental taxa and is likely more common than is currently vouchered. Knowledge of the two species occurring at the same site is important information for detecting most of the occurrences. Tentative synonym: Rhus multilicius Bailey.

Native to North America?

Yes

Sometimes confused with

Rubus allegheniensis:
lower surface of leaflets evidently hairy and axis of inflorescence with stipitate glands (vs. R. elegantulus, with the lower surface of leaflets without hairs or with hairs along the primary veins and axis of inflorescence lacking stipitate glands).
Rubus canadensis:
prickles of the stem absent or sparse, numbering 0-10 per 10 cm of stem (vs. R. elegantulus, with prickles of the stem moderately abundant, numbering usually 10-60 per 10 cm of stem).
Rubus pensilvanicus:
lower surface of leaflets evidently hairy (vs. R. elegantulus, with lower surface of leaflets without hairs or with hairs along the primary veins).

Synonyms

  • Rubus amicalis Blanch.
  • Rubus kennedyanus Fern.
  • Rubus multiformis Blanch.

Family

Rosaceae

Genus

Rubus