Abies amabilis

Pacific silver fir
Pacific silver fir foliage from above
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnospermae
Division:	Pinophyta
Class:	Pinopsida
Order:	Pinales
Family:	Pinaceae
Genus:	Abies
Species:	A. amabilis
Binomial name
Abies amabilis Douglas ex J.Forbes
Range

Cone growth

Abies amabilis, commonly known as the Pacific silver fir, is a fir native to the Pacific Northwest of North America, occurring in the Pacific Coast Ranges and the Cascade Range. It is also commonly referred to in English as the white fir, red fir, lovely fir, amabilis fir, Cascades fir, or silver fir. The species name is Latin for 'lovely'.

Description

The tree is a large evergreen conifer growing to 30–45 metres (98–148 feet), exceptionally 72 m (236 ft) tall, and with a trunk diameter of up to 1.2 m (3 ft 11 in), exceptionally 2.3 m (7 ft 7 in). 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 centimetres (3⁄4–1+3⁄4 in) long and 2 millimetres (1⁄16 in) wide by 0.5 mm (1⁄32 in) thick, matte dark green above, and with two white bands of stomata below, and slightly notched at the tip. 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 (3+1⁄2–6+3⁄4 in) long and 4–6 cm (1+1⁄2–2+1⁄4 in) 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.

The tree can live to over 400 years old.

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 (5⁄8–1 in)—and smaller cones, which are 5–11 cm (2–4+1⁄4 in) long.

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  Bark
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  Foliage bottom
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  Close-up of shoot from below, showing shoot pubescence and white stomatal bands
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  Foliage top

Distribution and ecology

The species is 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 from sea level to 1,000 m (3,300 ft) in the north of the range, and to 610–2,000 m (2,000–6,560 ft) in the south of the range. Populations on the east slope of the Cascades are confined to elevations above 1,000 m (3,300 ft) in Washington and 1,160 m (3,810 ft) in Oregon.

It is always found in temperate rainforests with relatively high precipitation and cool, humid summers. Growing in dense stands, it prospers in shade and snow. Common associate trees are western hemlock in northern ranges, Douglas-fir in central areas, and California buckeye in the extreme southern area of its range. Western hemlock is equally shade tolerant, but Pacific silver fir saplings are more resilient of ground obstacles. Though its thin bark makes it susceptible to fire, the slow-growing saplings succeed less shade-tolerant species. It survives well at high elevation, but eventually succumbs to root or heart rot, in addition to diseases and insects such as Adelges piceae.

On northeastern Vancouver Island, Pacific silver fir grows along with western hemlock in dense forests with sparse understory vegetation. Another type of forest dominated by western redcedar and western hemlock with more open canopies and an understories composed primarily of salal (Gaultheria shallon) also occurs in the area. The two forest types occur in areas with very similar environmental conditions and are separated by sharp boundaries, often less than 10 metres (33 ft) wide. Western redcedar recruitment is nearly absent in the western hemlock-Pacific silver fir forest type, and there is no evidence of a transitional stage between the two types. It has been hypothesized that, once established, these forest types are self-sustaining and are unlikely to change unless a major disturbance occurs.

Uses

Indigenous Nations, including but not limited to the Nuxalk, Haisla, and Kitasoo Nations, used Abies amabilis or Silver Fir for medicinal purposes. Ethnobotanist Daniel Moerman notes, for example, that Nuxalk Peoples mixed mountain goat tallow with liquid pitch to treat sore throat. An infusion of bark, by contrast, may have been used to address stomach issues.

In addition to medicinal uses, hardened pitch of the plant was also sometimes chewed for pleasure by the Ditidaht Peoples. The foliage has an attractive scent and was admired for its scent long before the arrival of European settlers in its native range. Ditidaht Peoples brought boughs into their homes as an air freshener, whereas Nlakaʼpamux Peoples boiled boughs to create unique plant-based hair perfumes.

The wood is soft and not very strong; settlers thus tended to use this species for paper making, packing crates, and other cheap construction work. The lumber is often paired with that of western hemlock.

Seeds were not brought to England for cultivation until the 19th century. David Douglas first transported seed abroad in 1825. Today, Abies amabilis or Silver Fir is sometimes 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. Silver Fir is sometimes used for Christmas decoration, including Christmas trees..