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Western lily (Lilium occidentale)
ENDANGERED
 


Lilium occidentale flower
Lilium occidentale plant
Lilium occidentale habitat
Flower (left), habit (center), and habitat (right) of western lily. Photos by Kelly Amsberry (left), Melissa Carr (center) and Rebecca Currin (right). If downloading images from this website, please credit the photographer.

Family
Liliaceae

Taxonomic notes
This species is thought to hybridize with other Lilium species, including L. columbianum and L. pardalinum ssp. vollmeri.

Plant description
Western lily is a perennial that grows from a rhizomatous bulb, with a slender, unbranched stem 60-170 cm tall. The dark green leaves are narrowly oblanceolate, 6-22 cm long by 0.5-2.5 cm wide, and mostly scattered, with usually only the central leaves whorled. The showy, nodding flowers number 1-10 (25) on very long pedicels, the tepals linear-oblong, 4-5 cm long, and revolute half their length or more. The distal half to two-thirds of the tepals are crimson to deep red within, the basal part orange, yellow, or greenish yellow, sometimes shading to green in the throat, with maroon spots. The basal orange to yellow portion comes to a point near the midline of each tepal, giving the overall appearance of a central golden star when the flower is viewed from its open end. The stamens and style are nearly straight; the anthers are 0.4-1.2 cm long and closely grouped around the pistil. Capsules are broadly ellipsoid and 2-4 cm long. Seedlings and young plants produce a single above-ground leaf.
 
This species exhibits high morphological variability, with two extremes, or forms, that appear to be correlated with the two distinct soil types in which western lily occurs (see Habitat). The "Oregon form" is typically shorter, has narrow leaves with little or no whorling, and produces fewer flowers. The "California form," which was described as the type specimen, is taller, has wider leaves with more whorling, and produces more flowers. The two morphological forms occur in both California and Oregon.

Distinguishing characteristics
Western lily is distinguished from other Lilium species by its wet coastal habitat, its true bulb, lack of fragrance, recurved tepals, nodding flowers, red flower color and star-shaped yellow flower centers, and its non-spreading stamens. All other orange- or red-flowered Lilium species within the range of western lily have stamens (and usually styles) that curve outward.

When to survey
Surveys should be completed when this species is flowering, from mid-June through July.

Habitat
Western lily is often found near the ocean in freshwater fens and on the edges of bogs, in coastal prairie and scrub, and in transition zones between these communities. The species also occurs in spruce forest, but plants in this habitat are stunted and do not produce flowers. It occurs at elevations ranging from just above sea level to about 120 m (400 ft).
 
The species occurs in two distinct soil types. The first type, deep organic peat, which is saturated for most of the year, appears to be correlated with the "Oregon form" of western lily (see Plant description). The second type, mineral-based soils, which tend to be acidic, poorly drained, and exhibit either a shallow iron pan or clay pan that holds water seasonally, appears correlated with the "California form" of the species.
 
Associated species that occur at nearly all western lily sites include Picea sitchensis, Malus fusca, Salix spp., Myrica californica, Gaultheria shallon, Spiraea douglasii, Vaccinium ovatum, Rubus spp., Lonicera involucrata, Calamagrostis nutkaensis, Carex obnupta, Gentiana sceptrum, Lotus formosissimus, Blechnum spicant, and Pteridium aquilinum. Common associates usually restricted to the northern portion of the species’ range (Del Norte County northward) include Pinus contorta ssp. contorta, Chamaecyparis lawsonia, Ledum glandulosum, Rhododendron occidentale, R. macrophyllum, Tofieldia glutinosa, Trientalis arctica, Sanguisorba officinalis, Sphagnum spp., and Viola palustris. Species more common in the southern portion of western lily’s range include Polystichum munitum, Holcus lanatus, and Anthoxanthum odoratum.

Range
Western lily is restricted within a narrow 4-mile- (6.4-kilometer-) wide band that spans about 200 miles (320 kilometers) along the Pacific coastline from Hauser, Coos County, Oregon to Loleta, Humboldt County, California. There are approximately 23 extant principle populations occurring within this limited region (as recognized by U.S. Fish and Wildlife Service), all of which are small (ranging from less than 0.1 acres to 10 acres), isolated, and densely clumped.

Oregon counties
Coos, Curry

Federal status
Endangered

Threats
Habitat loss due to agricultural, commercial, and residential development (particularly cranberry agriculture) and road construction and maintenance is a major threat to this species. The greatest long-term threat to western lily is successional encroachment by shrubs and trees in the absence of disturbance (from sources such as fire and grazing). Reduced reproductive output due to deer herbivory has been documented at many western lily sites. Hydrological alteration, fungal, viral, or bacterial infection, and horticultural collection also threaten this species. There is potential for random loss of genetic variability, as many western lily populations are very small, containing fewer than 200 individuals.

Conservation planning
A U.S. Fish and Wildlife Service Recovery Plan (pdf document, 7.13 MB) was released for western lily in 1998.
 
A 5-Year Review (pdf document, 834kB) for western lily was completed in 2009 by U.S. Fish and Wildlife Service.

Did you know?
Hummingbirds are the principal pollinators of western lily, although bees and other insects also transfer pollen of this species.

References
DeWoody, J. and V. D. Hipkins. 2006. Genetic diversity and differentiation in western lily (Lilium occidentale). Unpublished report for the U.S. Fish and Wildlife Service. National Forest Genetic Electrophoresis Laboratory, Placerville, California.
 
Imper, D.K. 1997. Ecology and management of the endangered western lily (Lilium occidentale) in northwestern California. Pages 23-33 in Kaye, T. N., A. Liston, R. M. Love, D. L. Luoma, R. J. Meinke, and M. V. Wilson, editors. 1997. Conservation and management of native plants and fungi. Native Plant Society of Oregon, Corvallis, Oregon.
 
Meinke, R.J. 1982. Threatened and endangered vascular plants of Oregon: An illustrated guide. Unpublished report for the U.S. Fish and Wildlife Service, Region 1, Portland, Oregon. Oregon Department of Agriculture, Salem, Oregon.
 
ORBIC (Oregon Biodiversity Information Center). 2010a. Rare, threatened and endangered species of Oregon. Institute for Natural Resources, Portland State University, Portland, Oregon.
105 pp. Available at http://orbic.pdx.edu/documents/2010-rte-book.pdf (pdf document, 971 kB). Accessed December 13, 2010.
 
ORBIC (Oregon Biodiversity Information Center). 2010b. ORBIC element occurrence database. Portland, Oregon.
 
Peck, M. E. 1961. A manual of the higher plants of Oregon. Binfords and Mort, Portland, Oregon.
 
USFWS (U.S. Fish and Wildlife Service). 1994. Determination of endangered status for Lilium occidentale (western lily). Federal Register 59:42171-42176. Available at http://ecos.fws.gov/docs/federal_register/fr2659.pdf (pdf document, 2.13 MB). Accessed September 22, 2010.
 
USFWS (U.S. Fish and Wildlife Service). 1998. Recovery Plan for the endangered western lily (Lilium occidentale). U.S. Fish and Wildlife Service, Portland, Oregon. 82 pp. Available at http://ecos.fws.gov/docs/recovery_plan/980331b.pdf (pdf document, 7.13 MB). Accessed September 22, 2010.
 
USFWS (U.S. Fish and Wildlife Service). 2009. Lilium occidentale (western lily) 5-year review: Summary and evaluation. U.S. Fish and Wildlife Service, Arcata Field Office, Arcata, California. Available at http://ecos.fws.gov/docs/five_year_review/doc2408.pdf (pdf document, 834 kB). Accessed September 22, 2010.