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 plant is thickets and hedges. The habit is high-arching, then bent down. The stem has mixed prickles, bent down, sickle-like, and hooked. The pricklets, acicles, and stalked glands on the faces are unequal, the prickles on the angles strong, nearly equal, long-pointed, very stout-based, sicklelike, and bent down. The leaflets are pale, often felted below, sharply and unevenly toothed, the terminal one egg-shaped, with a long point, the basal one very shortly stalked. The rachis is very strongly armed, the prickles more hooked, the smaller arms more glandular. The sepals are greyish-olive, with a white margin, widespread-ing or erect in fruit. The plant recalls the Sub-erecti group.
Rubus uncinates, P. J. Muell. - This plant is only found in woods. The armature is slender, both prickles and pricklets, which are bent down. The leaflets are thin, usually softly hairy, with a grey felt below, the terminal one nearly wedge-shaped, inversely egg-shaped. The stalks and midribs have slender, sickle-like, and hooked prickles. The panicle is very hairy, narrow, and cylindrical. The rachis and flower-stalk are densely, softly hairy, with many nearly sunk stalked glands, and crowded acicular, sickle-like, hooked, and bent-down prickles. The sepals are narrow, and bent back. The plant resembles R. infestus.
The habitat of this plant is hedges and commons. The habit is nearly prostrate. The stem is long, yellowish-brown. The prickles are very crowded. The pricklets, acicles, and stalked glands are most numerous below, the two last small. The leaflets are opaque above, yellowish-green, paler below, soft, with prominent ribs, with compound, finely-pointed, deeply-incised teeth, the terminal leaflet inversely egg-shaped, with a long narrow blunt point. The panicle is strongly developed, with a broad, round top, forming a corymb, with many unequal, sunk, nearly stalkless glands, and yellowish prickles. The plant is quite distinct from R. Sprengelii, and nearest R. infestus, distinguished by the prostrate-stem, nearly equal prickles, terminal leaflet, broad panicle, and yellow tint.
Rubus Drejeri, G. Jensen. - The habitat of this plant is wood borders, thickets, and hedges. The stem is hairy, dull-brown. The leaves are 3-5-lobed, the same colour on both sides. The pricklets, acicles, and stalked glands are unequally scattered and of various lengths. The prickles are unequal. The leaflets are thin, with irregular, shallow teeth, shortly pointed, roundish, inversely egg-shaped, harsh beneath. The lateral leaflets of the 3-lobed leaves are enlarged. The panicle is long, narrow, loose. The rachis is wavy, with soft-haired felt. The prickles are various, chiefly bent down. The plant is allied to R. melanoxylon and R. podo-phyllus.
The habitat of this plant is rough bushy places, hedges, etc. The habit is high-arching, climbing, or prostrate. The stem is strong, angular. The prickles are rather few, very strong, all on the angles, about equal. The faces of the stem have a very short, nearly equal, mixed armature. The leaflets are finely, closely, greenish-felted below, not overlapping, the terminal leaflet broadly egg-shaped, with a long, narrow point. The panicle is showy, pyramidal, with strong prickles. The rachis has many, sunken, unequal, stalked glands, some small acicles, and strong, awl-shaped, rather straight prickles. The sepals are turned back. This species flowers in July and August, and is a deciduous shrub.