Weed Information: Rubus laciniatus (blackberry, cutleaf)
Back to Plant List

Rubus laciniatus (blackberry, cutleaf)

Family: Rosaceae

Description

This alien species has escaped from cultivation, and although less common than Rubus discolor, is profuse in some regions. The leaves have rather long, narrow, terminal segments.

Characteristics

Flower Color
  • White
Inflorescence Type (How the flowers are arranged on the plant)
  • Axillary cluster
  • Axillary racemes
  • Axillary spikes
  • Corymb
  • Panicle
  • Terminal raceme
  • Terminal spike
Number of Petals
  • 5 petals
Petal Separation
  • Completely free to base
Petal Tip
  • Pointed
  • Rounded
Flower Symmetry
  • Flowers regular
Flower Length (Head length in the Asteraceae)
  • 1.0 cm (.40 inch)
  • 1.5 cm (.6 inch)
  • 2.0 cm (.8 inch)
Flower Width (Head width in the Asteraceae)
  • 2.0 cm (.80 inch)
  • 2.5 cm (1.0 inch)
  • 3.0 cm (1.2 inches)
  • 3.5 cm (1.4 inches)
  • 4.0 cm (1.6 inches)
Number of Sepals
  • 5 sepals
Sepal Separation
  • Completely free to base
Sepal Tip
  • Pointed
Flower Sex
  • Bisexual (perfect)
Number of Styles
  • More than 10 styles
Number of Stamens
  • more than 10 stamens
Stamens Attached to the Petals
  • Stamens NOT attached to the petals
Stamens Connate (united)
  • Filaments or anthers NOT united

Carpel Separation
  • Carpels separated
Number of Carpels
  • >10 carpels
Ovary Position
  • Superior (hypogynous)
Fruit Type
  • Berry, black
  • Berry, green
  • Berry, red
  • Aggregate
Fruit Length at Maturity
  • 1.0 cm (.40 inch)
  • 1.5 cm (.60 inch)
  • 2.0 cm (.80 inch)
Fruit Width at Maturity
  • 1.0 cm (.40 inch)
  • 1.5 cm (.60 inch)
  • 2.0 cm (.80 inch)
Burs
  • Fruit or seed NOT bur-like

Leaf Arrangement
  • Alternate
Leaf Type
  • Compound palmate 4 or 5 leaflets
  • Trifoliolate (3 leaflets)
Stipules
  • Foliaceous 4-10 mm (.16 - .40 in) long
  • Foliaceous > 1 cm (> .40 inch) long
Tendrils
  • Tendrils absent
Venation
  • Palmate
  • Pinnate
Petiole (leaf stem) Blade Ratio
  • Petiole 25% - 75% total length
Leaf Length (blade PLUS petiole)
  • 4 - 10 cm (1.60 - 4.0 inches)
  • 1 - 2 dm (4.0 - 8.0 inches)
Leaf Width
  • 4 - 10 cm (1.6 - 4.0 inches)
  • 1 - 2 dm (4.0 - 8.0 inches)
Leaf or Leaflet Margin
  • Dentate
  • Lobed
  • Serrate
Leaf or Leaflet Blade Base
  • Acute (cuneate)
  • Oblique
  • Truncate
Leaf or Leaflet Tip
  • Acuminate (attenuate)
  • Acute
Leaf or Leaflet Blade Surface
  • Glabrous (NO hairs)
  • Lower leaf surface more hairy
  • Pubescent
Succulence
  • Not succulent

Milky Juice
  • Juice NOT milky (watery)
Woodiness
  • Semi-woody
  • Woody
Spines or Thorns
  • Spines on leaves or stems
Aromatic (vegetative structures)
  • Not aromatic
Life Cycle
  • Perennial
Growth Habit (while flowering)
  • Erect, spherical (bushy)
  • Climbing vine
Plant Height at Maturity
  • 6 - 8 dm (2.0 - 2.6 feet)
  • 8 - 10 dm (2.6 - 3.3 feet)
  • 1 - 1.5 meters (3.3 - 5.0 feet)
  • 1.5 - 2.0 meters (5.0 - 6.6 feet)
  • 2 - 2.5 meters (6.6 - 8.3 feet)
Wind Dissemination
  • Not wind disseminated
Moisture Regime
  • Seasonally saturated
  • Mesic
Chlorophyll
  • Present

Stem Cross Section
  • Ridged
  • Round
Flowering Stem Leaves
  • Stem uniformly leafy
Main Stem Branches
  • Main stem branched

Root or Vegetative Propagule
  • Rhizomatous
  • Tap Root

US State
  • Connecticut
  • Delaware
  • Illinois
  • Kentucky
  • Massachusetts
  • Michigan
  • Missouri
  • North Carolina
  • New Jersey
  • New York
  • Ohio
  • Pennsylvania
  • South Carolina
  • Tennessee
  • Virginia
  • West Virginia
  • Indiana
  • Maryland
  • Rhode Island
  • Vermont
  • California
  • Colorado
  • Idaho
  • Montana
  • Oregon
  • Washington
  • Wyoming
Canadian Province or Territory
  • British Columbia
Other
  • District of Columbia

  • Aquatic and Riparian Plants of the West, 2003 (ISBN# 1-879906-59-7) See page: 348
  • Gilkey`s Weeds of the Pacific Northwest, 1980 (ISBN 0-88246-039-0) See page: 157
  • Northwest Weeds, 1990 (ISBN 0-87842-249-8) See page: 59
  • Weeds of California, 1970, State of California Publications and Documents. See page: 249
  • Weeds of California and other Western States, 2007 (ISBN 13: 978-1-879906-69-3) See Page: 1426
  • Listed as a `Weed` by the Biota of North America Program, 2008 x
  • Listed in the WSSA Composite List of Weeds X
Back to Plant List