Rubus bifrons — twice-leaved blackberry

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

• 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

  • pink
  • red

  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 type

  the inflorescence is a panicle (branched with the individual flowers on stalks)

  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 cilia (Ilex)

  NA

  Sepal tip glands

  • there are glands at the tips of the sepal lobes
  • 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

• 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

  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 truncate (ends abruptly in a more or less straight line as though cut off)

  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

  the leaf blade has tangled or woolly-looking hairs, without glands

  Leaf blade scales

  there are no scales on the leaf blades

  Leaf blade shape

  • the leaf blade is oblong (rectangular but with rounded ends)
  • the leaf blade is obovate (egg-shaped, but with the widest point above the middle of the leaf blade)
  • the leaf blade is ovate (widest below the middle and broadly tapering at both ends)

  Leaf blade texture

  the leaf blade is herbaceous (has a leafy texture)

  Leaf blade translucent dots

  there are no translucent dots on the leaf blade

  Leaf duration

  • the leaves drop off in winter (or they wither but persist on the plant)
  • the leaves remain green all winter

  Leaf form

  the plant is broad-leaved (with broadly flattened leaf blades)

  Leaf lobe tips (Quercus)

  NA

  Leaf stalk

  the leaves have leaf stalks

  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

• Place

  Habitat

  terrestrial

  New England state

  • Massachusetts
  • Rhode Island

  Specific habitat

  • edges of forests
  • forests
  • human-disturbed or -maintained habitats
  • meadows or fields

• 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 doming (arched over to touch the ground at their tips) to trailing (lying along the ground or neighboring vegetation)
  • the first year cane stems are upright or arching

  Pith shape

  the outline of the pith in a twig is roughly round

  Twig papillae (Vaccinium species only)

  NA

  Twig winter color

  • brown
  • red

  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

From Flora Novae Angliae dichotomous key