. Conservation strategy for Silene spaldingii (Spalding's catchfly) in Montana . Botany; Rare plants; Silene spaldingii. Figure 23. Map of EO #10 with nearby EO #9. Vegetation Associated Dominant Species: Festuca idahoensis, Elymus spicatus, Stipa nelsonii, Lupinus sericeus, Monarda fistulosa and Rosa woodsii (Wood's rose). Exotic Species: Centaurea maculosa, Potentilla recta, Bromus tectorum, and Sisymbrium altissimum (tall tumblemustard). August 27, 2004. Survey Data First Observation: Subpopulation A: July 27, 1988 Subpopulation B: August 27, 2004 Last Observation: Subpopulation A: August 2
. Conservation strategy for Silene spaldingii (Spalding's catchfly) in Montana . Botany; Rare plants; Silene spaldingii. Figure 23. Map of EO #10 with nearby EO #9. Vegetation Associated Dominant Species: Festuca idahoensis, Elymus spicatus, Stipa nelsonii, Lupinus sericeus, Monarda fistulosa and Rosa woodsii (Wood's rose). Exotic Species: Centaurea maculosa, Potentilla recta, Bromus tectorum, and Sisymbrium altissimum (tall tumblemustard). August 27, 2004. Survey Data First Observation: Subpopulation A: July 27, 1988 Subpopulation B: August 27, 2004 Last Observation: Subpopulation A: August 27, 2004 Subpopulation B: August 27, 2004 Table 5. Survey data for EO #10. Year Total SPA SPB 1988 12 mature plants 12 -- 2004 173 mature plants 154 19 This population on the Flathead Indian Reservation is located seven kilometers northeast of Niarada and was first documented in 1988 with 12 plants. The only follow-up survey was conducted in 2004 when 173 flowering/fruiting plants were observed in two subpopulations, making this the third largest in the state according to recent surveys. The population occurs on the lower slopes of the Hog Heaven Range directly below treeline and covers hectares. Both subpopulations are found on northerly to westerly aspects of west-facing draws. Dominant species at the site include Festuca idahoensis, Elymus spicatus, Stipa nelsonii, Lupinus sericeus, Monarda fistulosa and Rosa woodsii. Weeds were abundant at the site in 2004 and included Centaurea maculosa, Potentilla recta, Bromus tectorum, and Sisymbrium altissimum. C. maculosa and S. altissimum both occurred in dense patches throughout the area. Grazing, although permitted, was not occurring at the time of the 2004 survey. The abundance of invasive weeds on this site is likely to be detrimental to the long-term viability of S. spaldingii. Grazing, though not an observed threat in 2004, was noted to be a problem in 1988 and the quality of the site was noted to be poor at that time. Activ
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