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1 January 2007 Seed Shatter Dates of Antelope Bitterbrush in Oregon
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Abstract

Seed shatter dates for antelope bitterbrush (Purshia tridentata [Pursh] DC) were estimated from collections at 192 sites in Oregon and surrounding states. Shatter date was strongly correlated to elevation (r = 0.74) and an equation that included elevation, latitude, longitude, and longitude squared explained 79% of the variation in seed shatter dates. In general, earlier shatter dates were associated with more southerly latitudes, easterly longitudes, and lower elevations. Examination of climatic data confirmed the expectation that earlier shatter dates were associated with warmer sites. This information can assist those needing to schedule seed collection activities at multiple locations.

G. R. Johnson and Paul C. Berrang "Seed Shatter Dates of Antelope Bitterbrush in Oregon," Rangeland Ecology and Management 60(1), 99-103, (1 January 2007). https://doi.org/10.2111/06-003R1.1
Received: 5 January 2006; Accepted: 1 August 2006; Published: 1 January 2007
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