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Juniperus californica

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California juniper
Specimen (middle ground) in Mount Diablo, California

Apparently Secure  (NatureServe)[2]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order: Cupressales
Family: Cupressaceae
Genus: Juniperus
Section: Juniperus sect. Sabina
Species:
J. californica
Binomial name
Juniperus californica
Natural range of Juniperus californica
Closeup of natural range

Juniperus californica, the California juniper, is a species of juniper native to southwestern North America.

Description

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Juniperus californica is a shrub or small tree reaching 3–8 meters (10–26 feet), but rarely up to 10 m (33 ft) tall. The bark is ashy gray, typically thin, and appears to be "shredded".[5] The shoots[which?] are fairly thick compared to most junipers, between 1.5 and 2 millimeters (1⁄16 and 3⁄32 inch) in diameter.

The foliage is bluish-gray and scale-like. The juvenile leaves (on the seedlings) are needle-like and 5 to 10 mm (3⁄16 to 3⁄8 in) long. Arranged in opposite decussate pairs or whorls of three, the adult leaves are scale-like, 1 to 5 mm (1⁄16 to 3⁄16 in) long on lead shoots and 1 to 1.5 mm (1⁄32 to 1⁄16 in) broad.

The cones are berrylike, 7 to 13 mm (1⁄4 to 1⁄2 in) in diameter, blue-brown with a whitish waxy bloom, turning reddish-brown, and contain a single seed (rarely two or three).[5] The seeds are mature in about 8 or 9 months. The male cones are 2 to 4 mm (1⁄16 to 3⁄16 in) long and shed their pollen in early spring. This juniper is largely dioecious, producing cones of only one sex, but around 2% of plants are monoecious, with both sexes on the same plant.[6]

The California juniper is closely related to the Utah juniper (J. osteosperma) from further east, which shares the stout shoots and relatively large cones, but differs in that Utah juniper is largely monoecious. Its cones take longer to mature (two growing seasons), and it is also markedly more cold-tolerant.[citation needed]

Distribution and habitat

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As the name implies, it is mainly in numerous California habitats, although its range also extends through most of Baja California, a short distance into the Great Basin in southern Nevada, and into northwestern Arizona. In California it is found in: the Peninsular Ranges, Transverse Ranges, California Coast Ranges, Sacramento Valley foothills, Sierra Nevada, and at higher elevation sky islands in the Mojave Desert ranges.[7][8] It is also found off of the North American continental shelf, on Guadalupe Island in the Pacific Ocean, where there are less than 10 individuals.[9][10]

It grows at moderate altitudes of 750–1,600 m (2,460–5,250 ft). Habitats include: pinyon–juniper woodland with single-leaf pinyon (Pinus monophylla); Joshua tree woodland; and foothill woodlands, in the montane chaparral and woodlands and interior chaparral and woodlands sub-ecoregions.[citation needed]

Conservation

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The species is listed by the International Union for Conservation of Nature as least concern, and not considered globally threatened. However, one of the southernmost populations, formerly on Guadalupe Island off the Baja California Peninsula coast, was almost destroyed by feral goats in the late 19th century, with only a few plants remaining.[11][9]

Ecology

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J. californica provides food and shelter for a variety of native species, such as turkeys, deer, and many others. However, as the species matures, it becomes too tall to provide adequate food and shelter for deer and other ground animals of similar size.[12] is a larval host for the native moth sequoia sphinx (Sphinx sequoiae).

Uses

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The plant was used as a traditional Native American medicinal plant, and as a food source, by the indigenous peoples of California, including the Cahuilla people, Kumeyaay people (Diegueno), Serrano, and Ohlone people.[13][14] They gathered the berries to eat fresh and to grind into meal for baking.[5] The wood was also used for sinew-backed bows.[15]

J. californica is cultivated as an ornamental plant, as a dense shrub (and eventual tree) for use in habitat gardens, heat and drought-tolerant gardens, and in natural landscaping design.[5] It is very tolerant of alkali soil, and can provide erosion control on dry slopes. It is also a popular species for bonsai.[16]

References

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  1. ^ Farjon, A. (2013). "Juniperus californica". IUCN Red List of Threatened Species. 2013: e.T42226A2962888. doi:10.2305/IUCN.UK.2013-1.RLTS.T42226A2962888.en. Retrieved 12 November 2021.
  2. ^ NatureServe (2024). "Juniperus californica". Arlington, Virginia. Retrieved 26 September 2024.
  3. ^ "Juniperus californica Carrière". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved November 13, 2022.
  4. ^ "Juniperus californica Carrière". Catalogue of Life. Species 2000. n.d. Retrieved November 13, 2022.
  5. ^ a b c d "Lady Bird Johnson Wildflower Center – The University of Texas at Austin". www.wildflower.org.
  6. ^ Charters, Michael L. (2007): Wildflowers and Other Plants of Southern California: Juniperus californica. Retrieved October 16, 2007.
  7. ^ "Juniperus californica". in Jepson Flora Project (eds.) Jepson eFlora. Jepson Herbarium; University of California, Berkeley. 2018. Retrieved 2018-07-06.
  8. ^ Sullivan, Steven. K. (2018). "Juniperus californica". Wildflower Search. Retrieved 2018-07-06.
  9. ^ a b Luna-Mendoza, Luciana; Aguirre-Muñoz, Alfonso; Hernández-Montoya, J.C.; Torres-Aguilar, Marisol; García-Carreón, Jacinto; Hernandez, Orlando; Luvianos-Colin, Sergio; Cárdenas, Ana; Méndez Sánchez, Federico (2019). "Ten years after feral goat eradication: the active restoration of plant communities on Guadalupe Island, Mexico". Occasional Paper SSC. 62: 571–575.
  10. ^ Rebman, J. P.; Gibson, J.; Rich, K. (2016). "Annotated checklist of the vascular plants of Baja California, Mexico" (PDF). San Diego Society of Natural History. 45: 23.
  11. ^ León de la Luz, José Luis; Rebman, Jon P. & Oberbauer, Thomas (2003): On the urgency of conservation on Guadalupe Island, Mexico: is it a lost paradise? Biodiversity and Conservation 12(5): 1073–1082. doi:10.1023/A:1022854211166 (HTML abstract)
  12. ^ "Juniperus californica". www.fs.fed.us. Retrieved 2020-11-14.
  13. ^ "BRIT – Native American Ethnobotany Database". naeb.brit.org.
  14. ^ Sutton, Mark Q.; Earle, David D. (2017). The Desert Serrano of the Mojave River (PDF). Pacific Coast Archaeological Society Quarterly. p. 8.
  15. ^ "Juniper – California Juniper". mojavedesert.net. Retrieved 2020-11-14.
  16. ^ "Juniperus californica, California Juniper". www.laspilitas.com.

Further reading

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  • Adams, Robert P. (1993): 10. Juniperus californica. In: Flora of North America Editorial Committee (eds.): Flora of North America North of Mexico vol. 2.
  • Adams, Robert P. (2004): Junipers of the World: The Genus Juniperus. Trafford Publishing ISBN 141204250X.
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