Rubus hastiformis, commonly known as the spear-leaf bramble, is a perennial scrambling shrub in the family Rosaceae. It is native to Northwestern and Western Europe, with its range primarily concentrated in southern England, West Wales, and parts of France and Ireland. The genus name Rubus is the Latin term for "bramble" or "blackberry," while the species epithet hastiformis is derived from the Latin hastate ("spear-shaped"), referring to the distinctive, narrow, and tapering appearance of its terminal leaflets. Within the vast and complex Rubus fruticosus aggregate, R. hastiformis is recognized by its pink flowers and specific glandular stems. In earlier literature, it has also been referred to as R. thrysiger.

The plant is a "low-arching" species that typically forms dense patches in woodlands and shaded meadows. It is characterized by its stems, which are bluntly angled and covered in a mix of hairs, glands, and slender prickles. The leaves usually consist of three to five leaflets; the terminal leaflet is obovate and "truncate," meaning it is widest in the upper third and tapers toward the base in a nearly straight line. It produces narrowly pyramidal clusters of flowers with pale pink, elliptical petals and red-based styles. Unlike many other brambles, R. hastiformis is relatively shade-tolerant, though its stems turn a deep reddish-purple when exposed to direct sunlight.

Rubus hastiformis produces edible aggregate fruits, commonly referred to as blackberries. While not commercially cultivated like the larger-fruited hybrids, its berries are harvested by foragers for their sweet-tart flavor profile. Like other wild brambles, the fruits are best consumed fresh but are traditionally processed into jams, jellies, and cobblers. The young leaves and stems have a long history in European ethnobotany as a source of herbal tea, particularly valued for their astringent qualities. In the British Isles, it is one of many "micant" brambles that contribute to the regional biodiversity of wild berry foraging.

Nutritionally, the berries are a rich source of Vitamin C, Vitamin K, and dietary fiber. The plant's bioactive profile is dominated by polyphenols, specifically anthocyanins (which provide the dark color to the ripe fruit) and ellagitannins. The leaves are particularly high in tannins, which account for their traditional use in folk medicine as a remedy for minor gastrointestinal upset and as a gargle for throat irritation. Modern phytochemistry of the Rubus genus suggests these compounds provide significant antioxidant and anti-inflammatory benefits.