''Chamaecyparis lawsoniana'', known as Port Orford cedar or Lawson cypress, is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of conifer in the genus '' Chamaecyparis'', family Cupressaceae. It is

native Native may refer to: People * Jus soli, citizenship by right of birth * Indigenous peoples, peoples with a set of specific rights based on their historical ties to a particular territory ** Native Americans (disambiguation) In arts and entert ...

Oregon Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho. T ...

and northwestern California, and grows from sea level up to in the valleys of the

Klamath Mountains The Klamath Mountains are a rugged and lightly populated mountain range in northwestern California and southwestern Oregon in the western United States. As a mountain system within both the greater Pacific Coast Ranges and the California Coast ...

, often along streams.

Description

A large

evergreen In botany, an evergreen is a plant which has foliage that remains green and functional through more than one growing season. This also pertains to plants that retain their foliage only in warm climates, and contrasts with deciduous plants, whic ...

tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are ...

, specimens mature up to tall or more, with trunks in diameter, exceptionally . The bark is silver-brown, vertically furrowed, and thick near the base. The foliage is arranged in lacy, flat sprays with a feathery appearance, usually somewhat glaucous (i.e. blue-green) in color. The leaves are scale-like, long, with narrow white markings on the underside, and produced on somewhat flattened shoots. The foliage gives off a rather pungent scent, not unlike parsley. The seed

cones A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex. A cone is formed by a set of line segments, half-lines, or lines conn ...

are globose, in diameter, with 6–10 scales, green at first, maturing brown in early fall, 6–8 months after

pollination Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds, most often by an animal or by wind. Pollinating agents can be animals such as insects, birds, a ...

. The male cones are long, dark red, turning brown after pollen release in early spring. The seeds fall quickly and can float on water. Old specimens lack branches near the base and often have dead tops. They can live up to about 600 years of age.

Taxonomy

The species was first discovered (by European Americans) near

Port Orford, Oregon Port Orford ( Tolowa: tr’ee-ghi~’- ’an’ ) is a city in Curry County on the southern coast of Oregon, United States. The population was 1,133 at the 2010 census. The city takes its name from George Vancouver's original name for nearby C ...

, and introduced into cultivation in 1854 by collectors working for

Charles Lawson Quintin Charles Devenish "Charlie" Lawson (born 17 September 1959) is an actor, from Northern Ireland, who is best known for playing Jim McDonald on the long-running ITV soap opera, ''Coronation Street''. Early life and education Lawson was b ...

FRSE of the Lawson & Son nursery in

Edinburgh Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian on the southern shore of t ...

, Scotland, after whom it was named as Lawson Cypress by the describing botanist Andrew Murray. The

United States Department of Agriculture The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of com ...

officially calls it by the name Port Orford cedar, as do most people in its native area, but some botanists prefer to use the name Lawson cypress (or in very rare instances Port Orford cypress) instead. The name "Lawson's cypress" is widely used in horticulture.

Distribution and habitat

The species is

to southwestern

and northwestern California, and grows from sea level up to in the valleys of the

, often along streams. It fares best at the north end of its range.

Ecology

The thick bark provides resistance to wildfires, and the species regenerates well on disrupted land in a variety of soils, but requires consistent moisture. It is

shade tolerant In ecology, shade tolerance is a plant's ability to tolerate low light levels. The term is also used in horticulture and landscaping, although in this context its use is sometimes imprecise, especially in labeling of plants for sale in commercial ...

, but not so much so as competing species

western hemlock ''Tsuga heterophylla'', the western hemlock or western hemlock-spruce, is a species of hemlock native to the west coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Sonoma ...

and

white fir ''Abies concolor'', the white fir, is a coniferous tree in the pine family Pinaceae. This tree is native to the mountains of western North America, including the Cascade Range and southern Rocky Mountains, and into the isolated mountain ranges ...

. The old-growth population near

Coos Bay Coos Bay is an estuary where the Coos River enters the Pacific Ocean, the estuary is approximately 12 miles long and up to two miles wide. It is the largest estuary completely within Oregon state lines. The Coos Bay watershed covers an area of abou ...

, Oregon, was wiped out by logging and wildfires in 1867–1868, and again by fire and root disease in 1936.

Disease

In the wild, the species is seriously and uniquely threatened by a root disease caused by the oomycete pathogen, ''

Phytophthora lateralis ''Phytophthora lateralis'' is a soil-borne plant pathogen that causes cedar root disease in Lawson cypresses (''Chamaecyparis lawsoniana'') in Northern USA. This pathogen was first noted to cause disease in around 1920 on nursery stock near Sea ...

'', accidentally introduced in the early 1950s following the fungus's arrival to the

Pacific Northwest The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Tho ...

on nursery trees. This disease is also a problem for horticultural plantings in some parts of North America. The tree is sometimes killed, though less often, by other species of ''

Phytophthora ''Phytophthora'' (from Greek (''phytón''), "plant" and (), "destruction"; "the plant-destroyer") is a genus of plant-damaging oomycetes (water molds), whose member species are capable of causing enormous economic losses on crops worldwide, a ...

''. ''Phytophthora lateralis'' infection begins when mycelium, from a germinated spore, invade the roots. The infection then spreads through the inner bark and cambium around the base of the tree. Spread up the trunk is generally limited. Infected tissue dies and effectively girdles the tree. Large trees are more likely to be infected than small trees due to larger root areas (although all trees at the edges of infected streams will eventually succumb). However, large trees can often live with the infections for a longer duration (up to several years). ''C. lawsoniana'' in streamside populations are highly susceptible to ''P. lateralis'' infection. However, the rate of fungal spread through populations in dry upland areas appears to be slow. ''P. lateralis'' spreads through water via mobile spores (

zoospore A zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves. Diversity Flagella types Zoospores may possess one or ...

s). The fungus also produces resting spores (

chlamydospore A chlamydospore is the thick-walled large resting spore of several kinds of fungi, including Ascomycota such as '' Candida'', Basidiomycota such as '' Panus'', and various Mortierellales species. It is the life-stage which survives in unfavourable ...

s) that can persist in soil for a long period of time. New infections generally begin when soil is transferred from an infected population to a non-infected population via water, human or animal movement. After initial infection in streamside populations, secondary spread via zoospores quickly infects all downstream individuals. Human facilitated spread is thought to be responsible for most new, and all long-distance, infections. Soil on vehicle tires, especially logging trucks and other off-road vehicles, is considered the most pressing problem due to the volume of soil that can be carried and the traffic rate in and between susceptible areas. Spread on boots and mountain bike tires has also been suggested and probably contributes to new infections locally. Animal-facilitated spread is thought to occur, but is localized. The

United States Forest Service The United States Forest Service (USFS) is an agency of the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands. The Forest Service manages of land. Major divisions of the agency in ...

and Bureau of Land Management attempt to prevent ''Phytophthora'' spread through road closures, monitoring, research and education. Research has focused on determining the dynamics and mechanisms of spread, as well as attempts to breed resistant trees. One solution against ''Phytophtera'' is known generically as

Mancozeb Mancozeb is a dithiocarbamate non-systemic agricultural fungicide with multi-site, protective action on contact. It is a combination of two other dithiocarbamates: maneb and zineb. The mixture controls many fungal diseases in a wide range of f ...

and also commercially known as Dithane (C). Commercial preparations of the parasitic fungus '' Pythium oligandrum'' are licensed for pest control, and documented to predate many species of ''Phytophthora''.

Similar species

The extinct

Eocene The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', " ...

species '' Chamaecyparis eureka'', known from fossils found on Axel Heiberg Island in Canada, is noted as resembling ''C. lawsoniana'' and '' C. pisifera''. The associated genus ''

Calocedrus ''Calocedrus'', the incense cedar (alternatively spelled incense-cedar), is a genus of coniferous trees in the cypress family Cupressaceae first described as a genus in 1873. It is native to eastern Asia and western North America. The generic n ...

'' (incense-cedar) has thick orange-brown bark and the bark of ''

Thuja plicata ''Thuja plicata'' is an evergreen coniferous tree in the cypress family Cupressaceae, native to western North America. Its common name is western redcedar (western red cedar in the UK), and it is also called Pacific redcedar, giant arborvitae, w ...

'' (western redcedar) is comparatively thin; both have different foliage than Port Orford cedar.

Cultivation

''Chamaecyparis lawsoniana'' thrives best in well-drained but moist soils, in a fairly sheltered position in full sun. Several hundred named cultivars of varying crown shape, growth rates and foliage color have been selected for planting in parks and gardens. In the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the European mainland, continental mainland. It comprises England, Scotlan ...

(UK) the following have gained the

Royal Horticultural Society The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity. The RHS promotes horticulture through its five gardens at Wisley (Surrey), Hyde Hall (Essex), Harlow Carr (Nor ...

's Award of Garden Merit (confirmed 2017):

Uses

The species was discovered by Euro-Americans in the 1850s. The

wood Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin ...

is light yet has great strength and rot resistance, even after long exposure to salt water. Its properties resemble those of yellow-cedar, but was historically more available in the region. On shores lacking docks, logs were transported via high-line cable directly onto ship decks. It was valued for boatbuilding. The species was important to Oregon's lumber industry until the 1950s when it was crippled by disease. It was preferred for

storage battery A rechargeable battery, storage battery, or secondary cell (formally a type of energy accumulator), is a type of electrical battery which can be charged, discharged into a load, and recharged many times, as opposed to a disposable or prima ...

cell separation,

Venetian blinds A window blind is a type of window covering. There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard mate ...

, and other uses. Quality specimens eventually began to be shipped almost exclusively to

East Asia East Asia is the eastern region of Asia, which is defined in both Geography, geographical and culture, ethno-cultural terms. The modern State (polity), states of East Asia include China, Japan, Mongolia, North Korea, South Korea, and Taiwan. ...

, where it is highly valued. Large amounts have been exported to Japan where it is used in making coffins, shrines, and temples. Its

lumber Lumber is wood that has been processed into dimensional lumber, including beams and planks or boards, a stage in the process of wood production. Lumber is mainly used for construction framing, as well as finishing (floors, wall panels, wi ...

is known for its highly fragrant ginger aroma, caused by an oil which repulses decay and insects, including termites; this oil has been used as an insecticide. Due to the straightness of its grain, it is also one of the preferred woods for the manufacture of arrow shafts. It is also considered an acceptable, though not ideal, wood for construction of aircraft. The wood is considered more than acceptable for use in stringed instruments. Its fine grain, good strength and tonal quality are highly regarded for soundboards in guitar making.

Gallery

File:LawsonsCypress.jpg, Foliage with cones: immature seed cones below, pollen cones above File:Lawson cypress male cones.jpg, Male cones in spring with diagnostic red colour File:Chamaecyparis lawsoniana.jpg, Mature female cones File:Chamaecyparis lawsoniana imbricata pendula 01.jpg, Cultivar 'Imbricata Pendula', Rosemoor, Devon, UK

References

*Snyder, Gary. 1999. "The Gary Snyder Reader". Counterpoint.

External links

Jepson Manual treatment for ''Cupressus lawsoniana''
* {{Authority control Chamaecyparis, lawsoniana Trees of the Southwestern United States Trees of the Northwestern United States Flora of the Klamath Mountains Natural history of the California Coast Ranges Garden plants of North America Ornamental trees