A creeping perennial, woody at the base, of both native and planted Pinus sylvestris woodland, where it occurs in slight to moderate shade, on barish ground or leaf litter, sometimes with an acidic heathy herb flora. It spreads vegetatively and by seed, though seedling establishment seems largely restricted to disturbed ground. 0-730 m (Easterness).
There were severe losses of L. borealis before 1930, mostly through the clearance of native woodland. It may still be decreasing, although it has been better recorded recently. All English records are probably introductions, perhaps with tree seedlings.
Circumpolar Boreal-montane element.
Light (Ellenberg): 5
Moisture (Ellenberg): 5
Reaction (Ellenberg): 2
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 1.6
July Mean Temperature (Celsius): 12.7
Annual Precipitation (mm): 1008
Height (cm): 10
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 93
Count of 10km squares in Ireland: 0
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: 0.07
Scarce Atlas Account
Linnaea borealis L.
L. borealis usually occurs in native pinewoods and old plantations. It grows as a spreading mat with horizontal creeping woody stems that produce adventitious roots. Typical associates in pinewoods are Calluna vulgaris, Deschampsia flexuosa and Vaccinium myrtillus. Goodyera repens is also a common associate and at some localities Moneses uniflora grows in proximity. The plant occasionally occurs outside woodland in more upland habitats, growing in the shade of mountain rocks. It has been recorded at c. 800 metres in the Grampians and c. 600 metres on Ben Chonzie (Wilson 1956).
L. borealis is a creeping woody perennial and regenerates by producing rejuvenating shoots from buds on the main axis and other parts of the plant (Hagerup 1921). The plant is therefore able to spread in any direction and in favourable conditions may rapidly cover several square metres. It requires slight shade to flower well and in conditions too dark for flowering it may persist in a vegetative state. L. borealis is adapted for cross pollination although it is self-fertile. The funnel-shaped flowers are mainly suited to insects with short mouthparts. Flies, solitary bees, syrphids and some Lepidoptera are the main insect visitors (Barrett & Helenurm 1987; Knuth 1908). Fruits are adapted for animal dispersal by possessing two partially enclosed bracts with viscid hairs. The fruit breaks off below the bracts and sticks to fur and feathers (Ridley 1930). The fruits have been recorded on mountain hares, willow grouse and red grouse in Sweden (Ericson 1977; Ridley 1930). Seedling establishment seems to be rare and has been reported to any great extent only in disturbed ground (Ericson 1977).
L. borealis seems to be decreasing and there is little doubt that sites have been lost through clearance of native woodland. Many extant populations occur in old plantations where the timber is reaching or has reached economic maturity. Modern techniques of harvesting and ground preparation for replanting may exterminate these populations.
L. borealis has a circumpolar distribution. The three subspecies which are recognised differ slightly in leaf and flower shape. Subsp. borealis occurs from western Europe through northern Eurasia to Alaska, where it meets subsp. americana which occurs in most of North America and in Greenland. Subsp. longiflora is restricted to Pacific N. America (Hulten 1970; Hulten & Fries 1986).
P. S. Lusby
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1992. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 3. 2 vols.
1994. Scarce plants in Britain.
1993. Flora of Northumberland.