Soapweed (Yucca glauca) COSEWIC assessment and status report 2013
Official title: COSEWIC Assessment and Status Report on the Soapweed Yucca glauca in Canada - 2013
![Photo of a Soapweed, Yucca glauca, rosette and inflorescence (foreground). The leaves are long, narrow, and sharply pointed. The flowers are greenish-white](/content/canadasite/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/soapweed-2013/_jcr_content/par/img_33400/image.img.jpg/1515630278994.jpg)
Threatened
2013
Table of Contents
- COSEWIC Assessment Summary
- COSEWIC Executive Summary
- Technical Summary
- Preface
- Wildlife species description and significance
- Distribution
- Habitat
- Biology
- Population sizes and trends
- Threats and limiting factors
- Protection, status, and ranks
- Acknowledgements and authorities contacted
- Information sources
- Biographical summary of report writer
- Collections examined
List of Figures
- Figure 1. Soapweed clone at Pinhorn Grazing Reserve, AB in late June 2002. (Photo: D. Hurlburt)
- Figure 2. A locule of a Soapweed fruit, showing viable (black) and non-viable (white) seeds. The Yucca Moth larva has destroyed a portion of the viable seed through feeding. (Photo: D. Hurlburt)
- Figure 3. Current global range of native Soapweed (from Hurlburt 2001)
- Figure 4. Known native populations of Soapweed (Yucca glauca) in Canada
- Figure 5. Soapweed in heavy flower (early June 1999). South-facing coulee slope is representative habitat of northern populations of Soapweed. (Photo: D. Hurlburt)
- Figure 6. Soapweed habitat is sparsely vegetated and eroded. The Sweetgrass Hills in Montana are visible in the background. (Photo: D. Hurlburt)
- Figure 7. Four year old Soapweed seedling at Onefour, AB. Note the grass-like leaves rather than the sharp, erect leaves of an older plant. (Photo: D. Hurlburt)
- Figure 8. Growth habit of Soapweed showing multiple rosettes, which each flower once and subsequently die. (Photo: D. Hurlburt)
- Figure 9. Three Soapweed fruits on a single inflorescence. Fruits at Onefour exhibit a wide-range of coloration from reddish, as in this photo, to pale green. (Photo: D. Hurlburt)
- Figure 10. Percent of clones flowering for Onefour, Pinhorn and closest Montana populations (Loma and Ft Benton) from 1998 to 2011 as available (1998-2003: Hurlburt 2004, 2007, 2011). Absence of bars indicates years in which flowering was not assessed rather than no flowering. For the Onefour population, data are not available for 2006 and 2010 when flowering was reported to be high (Bradley et al. 2006; Walker, I. pers. comm. 2011)
List of Tables
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