Gymnosperm Database
Link to jump to start of content Home Topics Bookstore Links Site Map Contact Us

SEARCH

photo

A large mat-forming specimen in the White Pine Mountains of Nevada (USA). A mixed stand of Pinus flexilis and Pinus longaeva is visible in the background [C.J. Earle, 2001.09].

photo

Another large mat-forming specimen, near the alpine timberline on Tiffany Mountain in Washington (USA). The neighboring conifers are Pinus albicaulis [C.J. Earle, 2003.08].

photo

A specimen in Sierra Nevada National Park, Spain, elev. 2100 m [Jose Angel Campos Sandoval, 2006.06].

photo

Cones and foliage on the specimen shown above [Jose Angel Campos Sandoval, 2006.06].

off-site photos

 

Valid HTML 4.01 Transitional

Conservation status

Juniperus communis

Linnaeus 1753, p. 1040

Common names

Common juniper, genévrier commun [French] (Adams 1993), Siberian juniper, dwarf juniper, enebro común [Spanish].

Taxonomic notes

Many infraspecific taxa have been described in this highly polymorphic species, but most are sympatric, or merge into each other where they meet. Thus, the observed morphological differences are for the most part explainable on the basis of habitat differences, chiefly climate. This treatment follows Farjon (2005) in recognizing five varieties, but he cautions that further study is needed, and that variation within populations is comparable to the differences described between the varieties. The varieties are as follows:

"Juniperus communis is the most widespread juniper species, and many subspecies and varieties have been described. A major study, including chemical characters, is needed to clarify the taxonomy" (Adams 1993).

Description

"Shrubs or small trees dioecious, to 4 m (if trees, to 10 m), multistemmed, decumbent or rarely upright; crown generally depressed. Bark brown, fibrous, exfoliating in thin strips, that of small branchlets (5-10 mm diam.) smooth, that of larger branchlets exfoliating in strips and plates. Branches spreading or ascending; branchlets erect, terete. Leaves green but sometimes appearing silver when glaucous, spreading, abaxial glands very elongate; adaxial surface with glaucous stomatal band; apex acute to obtuse, mucronate. Seed cones maturing in 2 years, of 2 distinct sizes, with straight peduncles, globose to ovoid, 6-13 mm, bluish black, glaucous, resinous to obscurely woody, with 2-3 seeds. Seeds 4-5 mm. 2n = 22" (Adams 1993).

Distribution and Ecology

This is the most widespread conifer in the world, native to temperate Eurasia, and North America N of Mexico, occupying an extraordinary range of habitats (Farjon 2005). Among other places, it is native to Croatia; Sweden; and the United States. See also Thompson et al. 1999. Hardy to Zone 3 (cold hardiness limit between -39.9°C and -34.4°C) (Bannister and Neuner 2001, variety not specified).

North American (including Iceland and Greenland) distribution data from USGS (1999). Points plotted as tree icons represent isolated or approximate locations.

Big tree

Salomonson [no date, pre-2000] reported that the largest tree "is found at Råå in the province of Närke. It has a girth of 2,8 m. at breast-height." Due to the age and lack of detail in that record, it must be treated as doubtful at this time. A 2016 measurement of a tree at Albero del Poeta, Italy, found a girth of 2.6 m (Monumental Trees 2017), and this is the largest current reliable record. The Monumental Trees database also reports trees of 1.2 to 1.5 m girth growing in Latvia, Poland, and the Netherlands, with measurements from 2013 to 2015.

The tallest specimen currently living is likely a tree in Sääksjärvi, Finland that was 16.40 m tall and 89 cm girth when measured in 2011 (Rasanen 2011). The tallest one ever found grew at Lake Glypen in the province of Östergötland, but it fell in a storm late in 1980; the fallen tree was measured at 18.5 m long. Another tree, locally known as "Kungen" (the King), was 18 m tall, and grew at Röshult in Värnamo. It was blown over in a 2005 storm (Jakobsson 2017).

Oldest

Ages to 600 years have been reported without supporting data (Salomonson [no date]).

Dendrochronology

Ethnobotany

The seed cones are used to flavor gin (Adams 1993).

Observations

Remarks

The only juniper species that occurs in both North America and Eurasia.

Citations

Jakobsson, Fredrik. 2017.07.26. The tale of the tallest common juniper. http://ents-bbs.org/viewtopic.php?f=395&t=8067, accessed 2017.07.28.

Monumental Trees. 2017. Common juniper 'Albero del poeta' at Spiaggia di Pistis - Pistis beach in Arbus. https://www.monumentaltrees.com/en/ita/sardinia/carbonia/14586_spiaggiadipistispistisbeach/, accessed 2017.07.28.

Rasanen, Kouta. 2011.11.16. European Records in Finland. http://www.ents-bbs.org/viewtopic.php?f=45&t=3272, accessed 2017.07.28.

See also

Elias 1987.

Farjon (2005) provides a detailed account, with illustrations and details on the varieties.

Flora Celtica. [no date]. Uses of some common Scottish plants. http://www.rbge.org.uk/data/celtica/Plantuses.htm#Juniperus, accessed 2001.11.28, now defunct.

Little 1980

The Vascular Plant Image Gallery.

Last Modified 2017-07-28