Conservation Status of Castilleja Longispica On Custer And Gallatin National for
Conservation Status of Castilleja Longispica On Custer And Gallatin National for
Peter Lesica
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2. EXOTIC PLANTS: Knapweed (Centaurea maculosa) is present along some roads as well as in native grasslands along the front of the Beartooth Mountains. The semi-arid climate and gravelly soils found in the area are conducive to the spread of this aggressive exotic. There was 14 noticeably more knapweed in 1995 than in 1987 when initial surveys for The Nature Conservancy were conducted (Lesica 1988) . If this plant continues to spread it could outcompete and displace many native species (Watson ...and Renney 1974, Harris and Cranston 1979; Tyser and Key 1988), Castilleja longispica among them. Leafy spurge (Euphorbia esula) was observed along the road up Robertson Draw in an area that had been burned. This aggressive exotic may also pose a threat to populations of C. Longispica. The introduced grass, smooth brome (Bromus inermis), is present at both sites on the northwest side of the Yellowstone area (Grayling Power Pole, Grayling Arm Hebgen Lake) . This species can be invasive and tends to exclude other species.
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