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Sporobolus heterolepis - Achnatherum richardsonii - Danthonia intermedia Grassland | NatureServe Biotics 2019
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Name: Sporobolus heterolepis - Achnatherum richardsonii - Danthonia intermedia Grassland Reference: NatureServe Biotics 2019 Description: This montane grassland is best developed on the Limestone Plateau in the high western Black Hills of the United States. The zone of occurrences extends from the northwestern Black Hills in Wyoming, southeast and then south to west of Custer, South Dakota. A few stands occur in the adjacent Central Core on sites underlain by metamorphic rocks. Similar stands have been found at high elevations at two disjunct sites in the northwestern Black Hills: Cement Ridge southeast of Sundance, and Warren Peaks in the southern Bear Lodge Mountains. These sites are underlain by igneous rocks, and the stands differ somewhat in floristic composition. This type occurs at higher elevations, where there usually is significant snow cover from November through April. Most montane grasslands occur above 1800 m (5900 feet). In northeastern Wyoming, montane grasslands are found in drainage bottoms as low as 1556 m (5100 feet). Most montane grasslands occur in the bottoms and on lowermost slopes of broad drainages, on sites ranging from flat to moderately sloping with variable aspect. A few occur on rolling uplands.<br /><br />Most stands of Black Hills Montane Grassland are graminoid-dominated, but forb-rich. Overall herbaceous cover is in the 60-100% range. The type as currently defined includes several phases. On drier sites, overall cover is typically in the 50-75% range. Dominant graminoids include <i>Sporobolus heterolepis, Achnatherum richardsonii</i> and <i>Danthonia intermedia</i>. Other graminoids commonly present include <i>Elymus trachycaulus ssp. subsecundus</i> and <i>Hesperostipa spartea</i>. On more mesic sites, overall cover is often 100%. Dominant graminoids often include <i>Poa pratensis, Nassella viridula, Achnatherum richardsonii</i>, and <i>Danthonia intermedia</i>. <i>Elymus trachycaulus ssp. subsecundus</i> and <i>Hesperostipa spartea</i> may be present and locally common.  Accession Code: urn:lsid:vegbank.org:commConcept:31149-{37630AB0-B638-4FC0-A2AA-BDB0CC3C6765} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 09-Nov-2000 to: ongoing
	status: accepted Community's Parent: Festuca arizonica - Muhlenbergia montana - Poa fendleriana Southern Rocky Mountain Montane Grassland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.688947 NatureServe Explorer   Code: CEGL002240   Translated: Prairie Dropseed - Richardson's Needlegrass - Timber Oatgrass Grassland   Common: Black Hills Montane Grassland   Scientific: Sporobolus heterolepis - Achnatherum richardsonii - Danthonia intermedia Grassland (convergence) and Synonyms: (similar) Sporobolus heterolepis - Achnatherum richardsonii - Danthonia intermedia Herbaceous Vegetation (similar) CEGL002240 (similar) Sporobolus heterolepis - Achnatherum richardsonii - Danthonia intermedia Herbaceous Vegetation