red fir

Red Fir
Red Fir forest, Yosemite National Park
Conservation status
Least Concern (IUCN 2.3)
Scientific classification
Kingdom:	Plantae
Division:	Pinophyta
Class:	Pinopsida
Order:	Pinales
Family:	Pinaceae
Genus:	Abies
Species:	A. magnifica
Binomial name
Abies magnifica A.Murray

The Red Fir or Silvertip fir (Abies magnifica) is a western North American fir, native to the mountains of southwest Oregon and California in the United States.

Description

It is a large evergreen tree typically up to 40-60 m tall and 2 m trunk diameter, rarely to 76 m tall and 3 m diameter, with a narrow conic crown. The bark on young trees is smooth, grey, and with resin blisters, becoming orange-red, rough and fissured on old trees. The leaves are needle-like, 2-3.5 cm long, glaucous blue-green above and below with strong stomatal bands, and an acute tip. They are arranged spirally on the shoot, but twisted slightly s-shaped to be upcurved above the shoot. The cones are erect, 9-21 cm long, yellow-green (occasionally purple), ripening brown and disintegrating to release the winged seeds in fall.

Cones stand upright on branches

Needle-like leaves bend upward

It is a high altitude tree, typically occurring at 1,400-2,700 m altitude, though only rarely reaching tree line. The name Red Fir derives from the bark color of old trees.

There are two, perhaps three varieties:

• Abies magnifica var. magnifica (Red Fir) - cones large (14-21 cm), cone bract scales short, not visible on the closed cones. Most of the species' range, primarily in the Sierra Nevada.
• Abies magnifica var. shastensis (Shasta Red Fir) - cones large (14-21 cm), cone bract scales longer, visible on the closed cone. The northwest of the species' range, in southwest Oregon and Shasta, Siskiyou and Trinity Counties in northwest California.
• Trees on the eastern side of the southern Sierra Nevada also have long bracts, and additionally have smaller cones, 9-15 cm long. These trees, possibly a third variety, have not been formally named.

Red Fir is very closely related to Noble Fir (Abies procera), which replaces it further north in the Cascade Range. They are best distinguished by the leaves; Noble Fir leaves have a groove along the midrib on the upper side, while Red Fir does not show this. Red Fir also tends to have the leaves less closely packed, with the shoot bark visible between the leaves, whereas the shoot is largely hidden in Noble Fir. Some botanists treat Abies magnifica var. shastensis as a natural hybrid between Red Fir and Noble Fir.

Discovery

This tree was discovered by William Lobb on his expedition to California of 1849 – 1853, having been overlooked previously by David Douglas.^[1]

Uses

The wood is used for general structural purposes and paper manufacture. It is also a popular Christmas tree.

References

• Conifer Specialist Group (1998). Abies magnifica. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 12 May 2006.

External links

• Gymnosperm Database - Abies magnifica
• Arboretum de Villardebelle - photos
• Arboretum de Villardebelle - more photos