This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The habitat of this species is thickets and hedges. The stem is furrowed and hairy. The numerous prickles are long and nearly equal. The leaflets are thick, lobed, deeply cut, with very compound, sharp-pointed teeth, and velvety ashy-felted below when young, greenish-grey with close felt when older. The panicle is long, narrow, cylindrical, leafy nearly to the top. The sepals have long points and are very strongly bent back. The fruit is long. The furrowed stem (hairy), unequal prickles, deeply-cut leaflets, narrow cylindrical leafy panicle distinguish the plant from R. radula; the dense hair on stem and rachis, deeply cut, thick, leaflets, narrow, less-branched panicle, stouter flower-stalks, larger flowers, from R. rudis.
Rubus rudis, Wh. & N. - The habitat of this plant is woods, thickets, and hedges. The habit is arching, prostrate, or climbing, furrowed above, and usually quite smooth, rough, with very short unequal-stalked glands and acicles. The prickles are numerous and short. The leaves are large, the leaflets when young with ashy and white felt below, coarsely and doubly toothed, the terminal leaflet roundish egg-shaped or oval, with a long, narrow point. The panicle is diffuse, broad, with crowded, often interlacing, many-flowered branches. The rachis and long, slender flower-stalk have very crowded stalkless glands. The leaflets are large and wedge-shaped. The flowers are rather small. The plant flowers in July and August, and is a deciduous shrub.
Rubus oigocladus, Muell. & Lef. - The habitat of this plant is woods and thickets. The stem is bluntly angled, dark bluish-green, thinly hairy. The leaflets are pale green, thinly hairy below, the terminal one inversely egg-shaped, with a blunt point, narrowed to the notched base. The panicle is narrow, very loose, with nearly erect, racemose branches forming a corymb. The rachis and flower-stalk have a white felt and dense short hair, nearly hiding the crowded nearly stalkless glands. The sepals are strongly bent back when the petals fall. The fruit is rather long.
The habitat of this plant is woods and hedges. The habit is low-arching. The stem is bluntly angled, hairy, bluish-green, pale, very leafy, with numerous, short, unequal, bristles, and stalked glands rarely exceeding the hair. The leaves are mainly 3-5-lobed. The leaflets are large, the terminal one oblong, with a long blunt point. The panicle is long, narrow, forming a raceme above, with short branches of 2-4 long, stalked flowers below. The close felt and widespreading hairs obscure the numerous stalked glands and bristles. The sepals are bent back in flower and fruit. The plant resembles R. oigocladus or R. podophyllus, distinguished from the last by the yellowish-green colour, larger leaflets, blunt point, long, dense, widespreading hairs on the rachis, bent-back sepals.
Rubus podophyllus, P. J. Muell. - The habitat of this plant is bushy places in slate quarries, etc. The habit is nearly prostrate. The stem is bluntly angled, dark, usually nearly smooth. The prickles are unequally scattered. The leaflets are convex, green, with a few widespreading teeth. The terminal leaflet is bluntly and narrowly pointed, oval-oblong, with a rather short point. The panicle forms a raceme above. The rachis has close grey felt. The prickles are chiefly acicular, the acicles and stalked glands are weak and unequal. The plant resembles R. mucronatus and R. melanoxylon or R. ericetorum.