A key for weedy Blackberries and Rose species.

The keying features may be influenced by environmental conditions. Thorn shape, leaflet number and leaflet size may vary between plants or positions on a single plant. Inspect several specimens to help determine the particular character. There are number of Blackberries that are known to be present in WA. If you find an unusual specimen then take it to the Dept of Agriculture for identification.
Key for the Naturalised Rubus and Rosa species.
1 Fruit is a soft, fleshy berry that forms above the flowers. Leaves with 3-7 leaflets. Thorns cannot be broken from the cane. Flowers with 5 or more petals.
    2 Lower leaflets are all joined to a common point (palmate).
        3 Leaves green on top and white underneath.
            4 Primocanes hairless and angled in cross section.
                5 Petals white or white and fading to pinkish or pinkish in bud
                    fading to white..................................................................Rubus anglocandicans (English Blackberry)
                5a Petals pink.......................................................................Rubus ulmifolius (Elmleaf Blackberry)
                5b Petal pink. Canes thorny....................................Rubus ulmifolius var. ulmifolius (Elmleaf Blackberry)
                5c Petals pink. Canes thornless......Rubus ulmifolius var. anoplothyrsus (Thornless Elmleaf Blackberry)
            4 Primocanes hairy, obscurely angled. Petals white or pink.....Rubus rugosus (Keriberry)
        3a Leaves green on both sides.
            7 Petals white.
                8 Thorns stout and strong. Canes angled in cross section usually
                    with scattered red glands (dots). Flower 20-30 mm diameter...Rubus laudatus (Plains Blackberry)
                8a Thorns weak and thin. Canes round in cross section.
                    Flower 30-40 mm diameter...............................................Rubus roribaccus (Dewberry)
            7a Petals pink. Canes round or obscurely angled in cross section.
                Flowers 30-50 mm diameter..................................................Rubus parviflorus (Thimbleberry)
    2a Leaflets pinnate, canes thornless or thorns thin and small.
            9 Flowers 10-14 mm diameter. Berry red and hollow. Leaves green
                on top and white below. Canes round in cross section.........Rubus idaeus (Raspberry)
            9a Flowers 25-35 mm diameter. Berry dark red to black, not hollow.
                Leaves green on top and below. Canes round to obscurely angled
                in cross section.....................................................................Rubus loganobaccus (Loganberry)
1a Fruit is a hard, smooth, flask like “hip” that forms below the dead flowers or no fruit. 3-9 leaflets.
        Lower 2-8 leaflets are opposite in pairs (pinnate). Thorns on old stems can be snapped off.
    10 Stipules free. Flowers more than 50 mm diameter.
        11 Hip hairless. Stipules with comb-like edges. Thorns in pairs below leaves.
            Stems hairy and with glandular bristles....................................Rosa bracteata (Macartney Rose)
        11a Hip bristly. Stems hairless. 3-5 leaflets. Stems hairless but with
            glandular bristles......................................................................Rosa laevigata (Cherokee Rose)
    10a Stipules joined to petiole
    12 Stem thorns straight.
            13 Hip round and glandular hairy.............................................Rosa gallica (French Rose)
            13a Hip round but somewhat flattened and bristly. Leaves with 9-15
                leaflets.................................................................................Rosa roxburghii (Chestnut Rose)
            13b Hip oval, smooth and hairless. Flowers in hanging clusters....Rosa moschata (Musk Rose)
        12a Stem thorns curved.
            14 Peduncle (flower stalk) smooth and hairless. Leaves with 5-7
                leaflets..................................................................................Rosa canina (Dog Rose)
            14a Peduncle spiny with glandular hairs. Leaflets glandular
                underneath...........................................................................Rosa rubiginosa (Sweet Briar)
            14b Peduncle hairless.
                15 Stipules with comb-like edges. Large clusters of many flowers...Rosa multiflora (Japanese Rose)
                15a Stipules with smooth edges.
                    16 Climbing stems. Sepals with smooth edges...............Rosa odorata (Tea Rose)
                    16a Erect stems. Sepals with pinnate lobes usually
                        17 Flowers 40-50 mm diameter with 5 petals. Leaves with 3-5 leaflets.
                            Smooth red hip........................................................Rosa chinensis (China Rose)
                        17a Flowers 30-40 mm diameter with many petals in clusters
                                of less than 4 flowers usually. Rarely forms hips. Leaves
                                with 3-5 leaflets....................................................Rosa chinensis x moschata (Manetti Rose)
                        17c Flowers 25-35 mm diameter with many petals in
                            many-flowered clusters. Rarely forms hips. Leaves usually
                            have 7 leaflets and rarely 5......................................Rosa chinensis x multiflora (Rambler Rose)

Western Australian “Blackberry” and Rubus Characters.

Species
(Common name)
FlowersFruitCanesThornsLeaves
Rubus anglocandicans
(English Blackberry)
25-35 mm diameter with 5 white, not touching petals. Maybe pink in bud or fade to pinkish with age. Flowers in a compact pyramidal to cylindrical arrangement. Main flowering Dec-Jan.Black berryAngled.
Hairless or sparsely hairy.
Canes regularly tip root.
Straight or curved.
Robust.
Palmate, 3-5 leaflets. Green top, grey below.
Susceptible to biocontrol rust. Terminal leaflet 40-110 mm long.
Rubus idaeus
(Raspberry)
10-14 mm diameter with 5 white, not touching petals.Red hollow berry.Round.
Hairy or hairless.
Straight or curved, thin and small or thornless.Pinnate, 3-5 leaflets. Green top, grey/white below. Not susceptible to biocontrol rust.
Rubus laudatus
(Plains Blackberry)
22-30 mm diameter with 5 pure white, touching petals (no pink tinges). Flowers in sets of 3-12 on 5-20 cm stems from the leaf axils. Main flowering Sept-Nov.Black berryAngled.
Hairless or sparsely hairy. Scattered red glands (dots) usually present.
Straight or curved.
Robust.
Palmate, 5 leaflets. Green top, green below. Not susceptible to biocontrol rust. Terminal leaflet 40-120 mm long.
Rubus loganobaccus
(Loganberry)
25-35 mm diameter with 5 white, not touching petals.Dark red to black berryRound to obscurely angled.
Hairless to sparsely hairy.
Small & straight.Pinnate, 3, 5 or 7 leaflets. Green top, green below. Not susceptible to biocontrol rust.
Rubus parviflorus
(Thimbleberry)
Cultivated form.
30-50 mm diameter with 5 white, touching petals.
Scented.
Red hollow berryRound or obscurely angled. Red glandular hairs initially, balding with age. Bark flakes from old stems.None.3-5 lobed simple leaf. Green and hairy on top and below. Not susceptible to biocontrol rust.
Rubus roribaccus
(Dewberry)
30-40 mm diameter with 5 white, touching or not touching petals.Black berryObscurely angled. Hairless or hairy with dark glandular hairs.Straight or curved and thin.Palmate, 3-5 leaflets. Green top, green below. Not susceptible to biocontrol rust.
Rubus rugosus
(Keriberry)
About 12 mm diameter with 5 white or pink, probably not touching petals.Purple to black berryObscurely angled.
Very hairy with brownish hairs.
Usually straight and fine. 5 lobed simple leaf. Green top, yellowish below. Not susceptible to biocontrol rust.
Rubus ulmifolius var. anoplothyrsus
(Thornless Elmleaf Blackberry)
25-30 mm diameter with 5 pale to bright pink not touching petals.
Main flowering Dec-Jan.
Black berryAngled.
Looks hairless but has tiny hairs.
NonePalmate, 3-5 leaflets. Green top, grey/white below. Partially susceptible to biocontrol rust.
Rubus ulmifolius var. ulmifolius
(Elmleaf Blackberry)
15-20 mm diameter with 5 pale pink touching or almost touching petals. Flowers in a compact cylindrical arrangement.
Main flowering Dec-Jan.
Black berryAngled.
Sparsely hairy and purple or hairy and grey.
Straight or curved.
Robust.
Palmate, 3-5 leaflets. Green top, grey/white below. Partially susceptible to biocontrol rust. Terminal leaflet 40-80 mm long.

Australian “Wild Rose” Characters.

Species
(Common name)
FlowersFruitCanesThornsLeaves
Rosa bracteata
(Macartney Rose)
1-3 together, 45-90 mm diameter with 5 white to yellowish petals. Flower stalk <10 mm long, densely hairy, sparsely glandular.Orange-brown, densely hairy.Round, densely hairy, thorny.Straight to curved, detachable.Pinnate, 5-9 leaflets.
Stipules densely hairy and glandular with comb like edges and free.
Rosa canina
(Dog Rose)
1-few together, 20-40 mm diameter with 5 pink or white petals. Flower stalk hairless.Dark red, hairless, smooth hipRound, prickly, hairless to sparsely hairy.Curved, detachable, robust.Pinnate, 5-7 leaflets, hairless.
Stipules broad & joined to petiole.
Rosa chinensis
(China Rose)
4-5 together usually, 40-50 mm diameter with 5 red, pink, white or purple petals. Flower stalk hairless to glandular hairy.Red, hairless smooth hip.Round, almost smooth and hairless.Curved, flat, detachable, many to absent.Pinnate, 3-5(7) leaflets, almost smooth and hairless. Stipules joined to petiole with 2 ear like lobes.
Rosa chinensis X moschata
(Manetti Rose)
Several flowers together, 30-40 mm diameter with many pink to purple petals. Flower stalk with short glandular hairs.None seen.Round.
Probably hairless.
Curved, detachable, robust.Pinnate, 3-5 leaflets
Stipules broad and joined to the petiole.
Rosa chinensis X multiflora
(Rambler Rose)
Many flowers together, 25-35 mm diameter with many dark pink to red petals. Flower stalk with short glandular hairs.None seen.Round.
Probably hairless.
Curved, detachable, robust.Pinnate, 7 leaflets,
Stipules broad and joined to the petiole.
Rosa gallica
(French Rose)
Usually 1 and up to 3 together, very fragrant, 40-60 mm diameter, deep pink, rarely white.
Flower stalk densely glandular with needle-like hairs.
Dark red to brownish hip, 10-13 mm diameter.Round, short, stiffly erect.
Glandular bristles.
Straight, detachable, slender, scattered, unequal.Pinnate, 3-7 leaflets, usually 5, bluish green, hoary with raised veins underneath.
Stipules joined to petiole with 2 free tips.
Rosa laevigata
(Cherokee Rose)
Single flowers, 60-105 mm diameter with 5 white petals. Flower stalk bristly.Red hip, bristly.Round, hairlessCurved, detachable, robust.Pinnate, 3(5) hairless leaflets, Stipule broad and free.
Rosa moschata
(Musk Rose)
Loose cluster of many flowers, 50 mm diameter, creamy white, fragrant. Flower stalk with fine hairs and glands.Small oval hip.Round, climbing to 5 m long.Straight, detachable, few.Pinnate, 5-7 leaflets, no thorns on main axis (rachis). Stipules narrow joined to petiole and with pointed, spreading tips.
Rosa multiflora
(Japanese Rose)
Many flowers together, 15-40 mm diameter with 5 or more white to pink petals. Flower stalk hairless or short haired or glandular hairy.Red-brown to purple-brown hip, smooth, hairless and shiny.Round, usually hairless.Detachable, to 6 mm long and paired below the leaves.Pinnate, (3)5-9 leaflets, stipules with comb-like edges and joined to the petiole.
Rosa odorata
(Tea Rose)
1-3 flowers together, very fragrant, 30-100 mm diameter. Flower stalk hairless or glandular hairy. 5 or more petals, white or tinged with pink, yellow or orange.Red hip, smooth and hairless, somewhat globular rarely pear shaped.Round, long, climbing, hairless.Curved, flat, stout, to 7 mm tall.Pinnate, 5-9 leaflets, hairless. Main axis shortly prickly, glandular hairy. Evergreen or semi-evergreen. Stipules joined to petiole, with ear like lobes.
Rosa roxburghii
(Chestnut Rose)
1-3 flowers together, 40-80 mm diameter, with 5 pink to red-purple petals. Flower stalk short.Green-red to yellowish hip, densely prickly, hairless.Round with straight thorns.Straight, somewhat flat, detachable, to 5 mm long, paired at nodes.Pinnate, 9-15 hairless leaflets with prominent veins and conspicuously branching. Stipules joined to petiole with free lobes
Rosa rubiginosa
(Sweet Briar)
1-3 flowers together, 20-40 mm diameter, with 5 deep pink petals. Flower stalk with glandular hairs and spiny.Red to very dark red hip, usually hairless, no prickles.Round, with thorns usually mixed with glandular hairsCurved, detachable,
robust.
Pinnate, 5-7 leaflets, glandular hairy underneath. Stipules broad and joined to the petiole. Crushed leaf smell like apples.

Glossary

Pinnate - leaflets arise along the axis.

e.g. Dog Rose with 5 leaflets.

Palmate - leaflets arise from a common point.

e.g. English Blackberry with 5 leaflets.

Hip with flower remnants (pinnately lobed sepals) above.

e.g. Sweet Briar

Black berry

e.g. English Blackberry

White flower, 5 petals, not touching.

e.g. English Blackberry

Flower stalk showing glandular hairs present on some Rosa species