Template:Taxobox Vaccinium uliginosum (bog bilberry, bog blueberry,<ref>Template:PLANTS</ref> northern bilberry or western blueberry<ref>Template:Jepson eFlora</ref>) is a Eurasian and North American flowering plant in the genus Vaccinium within the heath family.
Vaccinium uliginosum is native to cool temperate regions of the Northern Hemisphere, at low altitudes in the Arctic, and at high altitudes south to the Pyrenees, the Alps, and the Caucasus in Europe, the mountains of Mongolia, northern China, the Korean Peninsula and central Japan in Asia, and the Sierra Nevada in California and the Rocky Mountains in Utah in North America.<ref name=galadriel>Template:EFloras</ref><ref>Template:EFloras</ref><ref>Altervista Flora Italiana, Falso mirtillo, Vaccinium uliginosum L.</ref><ref>Template:BONAP</ref>
Vaccinium uliginosum is a small deciduous shrub growing to Template:Cvt tall, rarely Template:Cvt tall, with brown stems (unlike the green stems of the closely related bilberry). The leaves are oval, Template:Cvt long and Template:Cvt wide, blue-green with pale net-like veins, with a smooth margin and rounded apex.<ref name=galadriel/>
The flowers are pendulous, urn-shaped, pale pink, Template:Cvt long, produced in mid spring. The fruit is a dark blue-black berry Template:Cvt diameter, with a white flesh, edible and sweet when ripe in late summer.<ref name=galadriel/>
Some authors separate them, but these are not considered distinct by all authorities. The subspecies are:
- Vaccinium uliginosum subsp. microphyllum Lange – Arctic plants
- Vaccinium uliginosum subsp. occidentale (A.Gray) Hultén – North American plants
- Vaccinium uliginosum subsp. uliginosum
- Den virtuelle floran – Distribution of Vaccinium uliginosum
- Jepson Manual treatment of Vaccinium uliginosum – flora of California.
- Flora Europaea: Vaccinium uliginosum
- Plants of British Columbia: Vaccinium uliginosum