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Pinus ponderosa / Juniperus horizontalis Woodland | NatureServe Biotics 2019
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Name: Pinus ponderosa / Juniperus horizontalis Woodland Reference: NatureServe Biotics 2019 Description: This woodland association has been described from north-central (Little Rocky Mountains) and the plains of northeastern Montana. All occurrences are below 1160 m (3800 feet) on calcareous shales and sandstones of rolling uplands and foothills, generally on slope shoulders. Except for accidentals of <i>Pseudotsuga menziesii</i> and very scattered <i>Juniperus scopulorum, Pinus ponderosa</i> is the only tree present, with somewhat stunted specimens comprising between 40% and 70% canopy cover. The undergrowth is rather depauperate in species diversity. <i>Juniperus horizontalis</i> is always the dominant species but varies enormously in cover, from 10-70% (even greater cover noted in reconnaissance). <i>Juniperus communis</i> can also attain high cover values but is not consistently present. <i>Rhus trilobata</i> and <i>Artemisia tridentata ssp. wyomingensis</i> are highly constant but seldom comprise more than 5% cover. There is a strong difference between the stands in the Little Rocky Mountains, which have a very depauperate graminoid cover, and those of northeastern Montana wherein <i>Pseudoroegneria spicata</i> and <i>Pascopyrum smithii</i> can attain canopy covers of greater than 30%. The forb component seldom has more than a trace amount of any species; those with the greatest constancy are <i>Solidago missouriensis, Thermopsis rhombifolia</i>, and <i>Linum perenne</i>. Structurally and compositionally this association is similar to both ~<i>Pinus ponderosa / Juniperus communis</i> Woodland (CEGL000859)$$ and ~<i>Pinus flexilis / Juniperus communis</i> Woodland (CEGL000807)$$.  Accession Code: urn:lsid:vegbank.org:commConcept:29769-{218EBC6D-9B63-4054-862C-ED1F0F9B904F} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: ongoing
	status: accepted Community's Parent: Pinus ponderosa Dry-Mesic Black Hills Forest & Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.685334 NatureServe Explorer   Code: CEGL000860   Translated: Ponderosa Pine / Creeping Juniper Woodland   Scientific: Pinus ponderosa / Juniperus horizontalis Woodland (convergence) and Synonyms: (similar) Pinus ponderosa / Juniperus horizontalis Woodland (similar) Pinus ponderosa / Juniperus horizontalis Woodland (similar) CEGL000860