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Euonymus occidentalis Nuttall ex Torrey


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Western Wahoo

(Euonymus occidentalis Nuttall ex Torrey)

in British Columbia

Report to:

Paul Kuster,

District Manager, Squamish Forest District

October 14, 1999,

Final Revision December 6, 1999

by

Fred Nuszdorfer



Research Program

Acknowledgements


Management direction and support for this consultation was provided by the Squamish Forest District Manager, Paul Kuster and Frank Ullmann, Operations Manager. Assistance in planning and fieldwork were provided by Steve Rochetta, Andre Germain, and Stu McDonald. Staff at Deakin Equipment provided assistance in first use of the GPS unit. Fred Cleland and communications staff in the regional office supplied equipment. Transportation to and from Squamish was organized by Rob Moody. Betty Adamson provided office assistance and maintained communication services while we were in the field. Administrative services and assistance were also provided by Vancouver Regional staff:Vinka MacQueen and Barb Sorensen. Peter Pitsakis generated the digital map of the area. John Sunde, made available his department’s scanning equipment and computer. Andy Miller, identified the reported location of western wahoo in the upper Elaho River area on an aerial photograph. Dave Miller, indicated the location of the new road to the site from which the plant was reported. Adolf Ceska, provided information about Western Wahoo and its location in British Columbia. Access to the herbarium specimens of the plant at the University of British Columbia was provided by Olivia Lee. I am grateful to the individuals listed above and those who assisted me but I have omitted to name through oversight. Also, I thank my family: Katalin, Jana and Nikki for accommodating and supporting my long field days and work on weekends and nights.

Funding for this project was provided by Her Majesty the Queen, through the Vancouver Regional Office Research budget and the Squamish Forest District operational budget.


Abstract


Euonymus occidentalis Nuttall ex Torrey or Western Wahoo was reported from an area in the upper Elaho River between Lava and Cesna creeks by the Western Canada Wilderness Committee in 1999. No evidence that this is the case has been found after one general field examination of the area and a second field examination at the site from where it was reported. Thus, there still is only one confirmed location of Western Wahoo in British Columbia. It is on the floodplain of the Tsolum River, near Courtenay, on Vancouver Island.

Introduction


Western Wahoo (Euonymus occidentalis Nuttall ex Torrey) was reported to be in the upper Elaho River area, Squamish Forest District This report was made by the Western Canada Wilderness Committee (WCWC) in an August 2, 1999 news release through their web site. Partly, the committee stated: “Volunteers were very excited to find an extremely rare tree species (only one other known site in Canada), the Western Wahoo, on their first day of research.” (Western Canada Wilderness Committee, 1999)

So far the only confirmed location of Western Wahoo (Euonymus occidentalis Nuttall ex Torrey) in British Columbia is near Courtenay, on Vancouver Island (Brayshaw, 1996), (Figure 1). The plant is on the floodplain of the Tsolum River on Crown land that is under fee-simple title. (Adolf Ceska, British Columbia Conservation Data Centre, personal communication).





Figure 1. Loacation (arrow) of Euonymus occidentalis or Western Wahoo in British Columbia (National Geographic Society, ).

The extent of the distribution of the species in the United States is illustrated in Figure 2.



Figure 2. Distribution of Euonymus occidentalis or Western Wahoo in the United States (Moore, 1999).

Description of Shrub


Western Wahoo is a 2 to 5 metre tall deciduous shrub. It has opposite leaves that are ovate to lanceolate and approximately 5 cm long by 2 cm wide (Brayshaw, 1996), Figure 3.



Figure 3. Western Wahoo, Euonymus occidentalis (Simpson, 1999).

Abundance

United States


Western Wahoo is widely distributed in California. Thus, it is not listed as rare or endangered there (CalFlora, 1999; The Resources Agency, 1999). It is S3, i.e. rare or uncommon, in Oregon, (The Oregon Natural Heritage Program, 1999). The species is ranked as S1, i.e. critically imperiled because of extreme rarity, in Washington State by the Washington Natural Heritage Program (Washington Natural Heritage Program, ).

British Columbia


Western Wahoo is ranked as S1 by the British Columbia Conservation Data Centre, Ministry of Environment, Lands and Parks (Douglas, 1998). This is because it has only been found in one location in the Province, as described earlier in this report.

The presence of Western Wahoo in the upper Elaho River valley would represent a surprising expansion of its range into a plant community and climatic regime that are very different from those of its known locations. However, a published report of a S1 species could not be discounted without a field investigation. This report describes the results of two trips to the upper Elaho River valley to find Western Wahoo.


Objectives


  1. Determine if the shrub, Euonymus occidentalis or Western Wahoo, is growing in the upper Elaho area

  2. If it is found, to describe the population, photograph it and sample a part for herbaria, provided a sample would not unduly effect the shrub(s).

  3. Report and communicate the results.

Methods


A preliminary survey of the general area from which the plant was reported was completed. Next, a field examination was done of the specific site of the species. This site was located on an aerial photograph by Andy Miller, who originally reported the presence of the species in the upper Elaho River valley. The site was examined and the shrubs growing there were sampled and preserved. This report was then prepared.

Location of Area


The area is in Tree Farm License 38, held by International Forest Products Ltd. Western Wahoo was reported to be near mile 64 on the logging road to the upper reaches of the valley, between Lava and Cesna Creeks(Figure 3).



Figure 4. Location of site where Eunymus occidentalis or Western Wahoo was reported (arrow). The Elaho River runs from north to south in the western portion of the photo (30BCC94119 No. 004). Lava Creek is seen in the lower part of the photograph, Cesna Creek is in the upper part of the photograph.

Results


The initial field examination of the general area where Western Wahoo was reported was done on August 12, 1999. The shrub was not found. A second field examination was carried out on October 8, 1999. The aerial photograph location, marked by Andy Miller, was traversed. Western Wahoo was also not found at this site. The shrub species that were found are listed in Table 1. Most of these species

Table 1. Shrub Species List for the Area Reported to Contain Western Wahoo. Names follow (Pojar et al., 1994).



Common Name of Species

Latin Name of Species

Alaskan Blueberry

Vaccinium alaskaense

Black Huckleberry

Vaccinium membranaceum

Current

Ribes sp*

Devil’s Club

Oplopananx horridus

False Azalea

Menziesia ferruginea

Falsebox

Pachistima myrsinites

Highbush-cranberry

Vibernum edule

Kinnikinnick

Arctostaphylos uva-ursi

Oval-leaved Blueberry

Vaccinium ovalifolium

Red Elderberry

Sambucus racemosa ssp pubens var. arborescens

Red-osier Dogwood

Cornus stolonifera

Red Huckleberry

Vaccinium parvifolium

Saskatoon Berry

Amelanchier alnifolia

Sitka Alde

Alnus crispa ssp. sinuata

Sitka Mountain-as

Sorbus sitchensis

Thimbleberry

Rubus parvifloru

Western Tea-berry

Gaultheria ovatifolia*

Utah Honeysuckle

Lonicera utahensis

Western Yew

Taxus brevifolia

Sitka Willow

Salix sitchensis*

  • to be confirmed or identified to species at herbarium

were also found on the first general examination of the area. These shrubs are typical of those that are commonly found in the CWHms1 (Southern Moist Submaritime Coastal Western Hemlock biogeoclimatic variant).

Discussion


Ideally, volunteers of the Western Canada Wilderness Commitee would have photographed and sampled the plant they considered to be Western Wahoo as proof of its presence in the area. This was not done.

As the summer progressed it became evident that it would not be possible to have a representative of the WCWC sample and mark the location of the plant in the field before the winter. I asked one of the volunteers, Andy Miller, who was listed as a contact in the press release referred to in the Introduction, to mark the location of the plant on a 1:20,000 colour aerial photograph. Andy Miller was able to do this because the location was in an opening in the forest below rock outcrops, which was distinctive on the aerial photograph. On the field examination it was not difficult for us to find this opening since it was along the WCWC trail past the area.

In the last month, International Forest Products Ltd. has built a logging road through part of the area identified on the aerial photograph by Andy Miller. It is unlikely that the logging road was built on the only location of the plant. This is because the habitat characteristics of the upper Elaho area are very different from those where the species has been documented in British Columbia, on a rich, moist, floodplain site (Dr. Adolf Ceska, Botanist, British Columbia Conservation Data Centre personal communication) and in the United States (e.g. references in Calflora, cited in the Introduction).

Conclusions


Western Wahoo (Euonymus occidentalis Nuttall ex Torrey) was not found in the upper Elaho River area. A road was recently built past the area from which the plant was reported but is not thought to have resulted in removal of the species. This is because the characteristics of area where it was reportedly seen (zonal sites and drier-than-zonal sites in the CWHms1) differs substantially from the known location of the species in British Columbia (a lower-elevation wetter and richer floodplain site) and the locations described in the United States.

References


Brayshaw, T. C. (1996). Trees and Shrubs of British Columbia, pp. 374. Vancouver: UBC Press.

CalFlora. (1999). CalFlora, a botanical resource for California on the internet. http://elib.cs.berkeley.edu:80/calflora/.

Douglas, G. W. (1998). Rare native vascular plants of British Columbia, pp. 423. Victoria, BC: British Columbia Conservation Data Centre, Resources Inventory Branch, Ministry of Environment, Lands and Parks, PO Box 9344 Stn. Prov. Gov.

Moore, M. (1999). Distribution map: Euonymus occidentalis, Western Wahoo, http://chili.rt66.com/hrbmoore/Maps/Euonymus_occidentalis.gif. PO Box 4565, Bisbee, Arizona, 85603: Southwest School of Botanical Medicine.

National Geographic Society. (1998). Map of British Columbia. http://plasma.nationalgeographic.com/xpeditions/main.html: National Geographic Society.

Pojar, J., MacKinnon, A. and editors, c. a. (1994). Plants of Coastal British Columbia Including Washington, Oregon & Alaska, pp. 527. Victoria: Lone Pine Publishing.

Simpson, M. (1999). Euonymus occidentalis var. parishii ------ Burning Bush ------ Celastraceae. http://www.sci.sdsu.edu/plants/ca_taxonomy/plants/Euonymus_occidentalis_p.html. San Diego, California: San Diego State University.

The Oregon Natural Heritage Program. (1999). Rare Plant List, pp. http://www.heritage.tnc.org/nhp/us/or/vd-l.htm: The Natural Heritage Network, The Oregon Natural Heritage Program.

The Resources Agency. (1999). STATE AND FEDERALLY LISTED ENDANGERED, THREATENED, AND RARE PLANTS OF CALIFORNIA, pp. http://www.dfg.ca.gov/Endangered/plants.html: State of California, The Resources Agency, DEPARTMENT OF FISH AND GAME, Habitat Conservation Division, Wildlife & Habitat Data Analysis Branch.

Washington Natural Heritage Program. Rare Plant Species with Ranks. (1999). PLANTS TRACKED BY THE WASHINGTON NATURAL HERITAGE PROGRAM. http://www.wa.gov/dnr/htdocs/fr/nhp/refdesk/lists/plantrnk.html. Olympia: Washington Natural Heritage Program, State of Washington, Department of Natural Resources, PO Box 47016, Olympia, WA 98504-7016.

Western Canada Wilderness Committee. (1999). Millennial Tree Camp launched. Rare Western Wahoo discovered in area WCWC steps up campaign to save Stoltmann Wilderness. http://www.wildernesscommittee.org/stoltmann/index.html. Vancouver: Western Canada Wilderness Committee.


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ancouver Forest Region

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