More info for the term:
coverDouglas hawthorn generally occurs as an understory dominant in plant
community types, or associations. It mostly occurs as an understory
species within sites dominated by black cottonwood (Populus
trichocarpa), eastern cottonwood (P. deltoides), quaking aspen (P.
tremuloides), or ponderosa pine (Pinus ponderosa). In western Montana,
black hawthorn has been described as a nonextensive riparian dominance
type [
17]. Pure stands of black hawthorn typically have an understory
occupied by Wood's rose (Rosa woodsii), chokecherry (Prunus virginiana),
or common snowberry (Symphoricarpos albus). In west-central Montana,
black hawthorn exhibited at least 5 percent cover value within the
tufted hairgrass (Deschampsia cespitosa) community type [
28].
Publications listing black hawthorn as an indicator or dominant
species in habitat types (hts), community types (cts), or dominance
types (dts) are presented below:
Area Classification Authority
MT Riparian dts Hansen and others 1988
WA Steppe hts Daubenmire 1970
ne OR Riparian cts Kauffman and others 1985