Chamaecyparis lawsoniana / Lawson cypress

Chamaecyparis lawsoniana, as described in 1864 by (A. Murray) Filippo Parlatore (1816–1877), in Annali del Museo Imperiale di Fisica e Storia Naturale di Firenze, is commonly known as Port Orford cedar, white or Oregon cedar, ginger pine, or Lawson cypress. This conifer was introduced to cultivation in 1854 when William Murray sent seed from California to Charles Lawson (1794-1873), then head of Peter Lawson and Son nursery of Edinburgh, Scotland. Golden Gate nursery of San Francisco offered plants for sale in 1858-59. [source: Jacobson].

Chamaecyparis_lawsoniana-1.jpg

Description. Lawson cypress is a large evergreen tree, maturing at heights of 200 feet (60 m) tall or more, with trunks up to 4 to 7 feet (1.2 – 2 m) in diameter, measured at breast height.

  • Bark is reddish-brown in color and is fibrous to scaly in vertical strips.
  • Foliage is feathery, growing in flat sprays, usually somewhat glaucous blue-green in color. The leaves are scale-like, measuring 0.15 inch (3–5 mm) long, with narrow white stomatal lines on the underside, and produced on somewhat flattened shoots. The foliage gives off a rather pungent scent, not unlike parsley.
  • Pollen cones measure 0.14 inch (3 – 4 mm) long, dark red, turning brown after pollen release in early spring.
  • Seed cones are globose, measuring 0.25 to 0.5 inch (7 – 14 mm) in diameter, and are comprised of 6 to 10 scales, colored green at first, later maturing brown in early fall, 6 to 8 months after pollination.
natural range of <em>Chamaecyparis lawsoniana </em>
natural range of Chamaecyparis lawsoniana

Distribution. This species is found from Coos Bay in southwestern Oregon to the Klamath river in northwestern California, near the coast and locally to 5,500 feet (1,700 m) in the Siskiyou Mountains and Mt. Shasta area. Prefers sandy and clay loams and rocky ridges. It is commonly grown, easily propagated, and is tremendously prolific with cultivars. Only a tiny fraction of cultivars originated in North America. A deadly root-rot (Phytopthora lateralis) appeared in Oregon circa 1950, and has resulted in a dramatic decrease of the commercial availability of the species.

Attribution from: Wikipedia, The Free Encyclopedia

Chamaecyparis lawsoniana `AFF Van Pelts Blue' This plant is the brightest blue and looks great when combined with golden or bright green conifers. It shimmers in natural light.
Photo by John Fertig
Chamaecyparis lawsoniana — Green Industry Images/copyrighted photo; donated by Ernie Wiegand.
Photo by Ernie Wiegand
Chamaecyparis lawsoniana — a closeup of foliage detail.
Chamaecyparis lawsoniana — a super closeup of foliage.
Photo by Stanford University
Chamaecyparis lawsoniana — a closeup of foliage and seed cones, at San Francisco Botanical Garden at Strybing Arboretum, California.
Photo by Eric Hunt
Chamaecyparis lawsoniana — an old-growth stand at Blue Lake trail, Fish Lake, California.
Photo by US Forest Service Dorena Genetic Resource Center

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