The bird's-foot violet, the coastal Scouler's catchfly, the eastern prairie fringed-orchid, the forked three-awned grass, the Howell's tritileia, the Kellogg's rush, the small-flowered sand-verbena, the streambank lupine, the common hoptree, the crooked-stem aster, the Lemmon's holly fern, the western spiderwort, the white wood aster, the wild hyacinth, the willowleaf aster, the climbing prairie rose, the tuberous Indian plantain, the margined streamside moss, the incurved grizzled moss, the silver hair moss, and the spoon-leaved moss all occur at the northern edge of their ranges in small, isolated pockets subject to random events, such as fire, flood or drought.
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