Abies amabilis

Pacific Silver Fir
Pacific Silver Fir foliage from above
Conservation status
LR/lc (IUCN2.3[1])
Scientific classification
Kingdom:	Plantae
Division:	Pinophyta
Class:	Pinopsida
Order:	Pinales
Family:	Pinaceae
Genus:	Abies
Species:	A. amabilis
Binomial name
Abies amabilis Douglas ex J.Forbes
Range

Pacific Silver Fir (Abies amabilis) is a fir native to the Pacific Northwest of North America, occurring in the Pacific Coast Ranges and the Cascade Range from the extreme southeast of Alaska, through western British Columbia, Washington and Oregon, to the extreme northwest of California. It grows at altitudes of sea level to 1,500 m in the north of the range, and 1,000-2,300 m in the south of the range, always in temperate rain forest with relatively high precipitation and cool, humid summers. Common associate trees are Douglas fir and California buckeye.^[2]

Close-up of shoot from below, showing shoot pubescence and white stomatal bands

Pacific Silver Fir bark

Morphology

It is a large evergreen coniferous tree growing to 30-45 m (exceptionally 72 m) tall^[3] and with a trunk diameter of up to 1.2 m (exceptionally 2.3 m). The bark on younger trees is light grey, thin and covered with resin blisters. On older trees, it darkens and develops scales and furrows. The leaves are needle-like, flattened, 2-4.5 cm long and 2 mm wide by 0.5 mm thick, matt dark green above, and with two white bands of stomata below, and slightly notched at the tip.^[4] The leaf arrangement is spiral on the shoot, but with each leaf variably twisted at the base so they lie flat to either side of and above the shoot, with none below the shoot. The shoots are orange-red with dense velvety pubescence. The cones are 9-17 cm long and 4-6 cm broad, dark purple before maturity; the scale bracts are short, and hidden in the closed cone. The winged seeds are released when the cones disintegrate at maturity about 6–7 months after pollination.

Pacific Silver Fir is very closely related to Maries' Fir A. mariesii from Japan, which is distinguished by its slightly shorter leaves (1.5-2.5 cm) and smaller cones (5-11 cm long).

Uses

The wood is soft and not very strong; it is used for paper making, packing crates and other cheap construction work. The foliage has an attractive scent, and is sometimes used for Christmas decoration, including Christmas trees.

It is also planted as an ornamental tree in large parks, though its requirement for cool, humid summers limits the areas where it grows well; successful growth away from its native range is restricted to areas like western Scotland and southern New Zealand.

Line notes

References

• Conifer Specialist Group (1998). Abies amabilis. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 12 May 2006.
• Gymnosperm Database: Abies amabilis (2008)
• C.Michael Hogan (2008) Aesculus californica, Globaltwitcher.com, ed. N. Stromberg
• Flora of North America (2008) Vol. 2: Pinaceae

Foliage bottom

Foliage top