More info for the terms:
cover,
mesicCreeping snowberry most commonly occurs on dry, sunny slopes at low to mid
elevations [
2,
4,
11,
16,
33], although it can occur in shady, mesic communities
as well [
6,
24,
25]. Creeping snowberry forms its greatest cover in 60 to
100 percent full sunlight [
7]. Elevational ranges have been listed for
California: 1,000 to 5,000 feet (305-1,500 m) [
6,
12] and Oregon: 1,000
to 6,480 feet (305-1,975m) [
2,
3,
29]. Creeping snowberry occurs on
coarse sands and gravels, sandy alluvium deposits, as well as fine
sandy-loam and silt loams, and moderately deep floodplains and terraces
[
13,
20]. In British Columbia creeping snowberry occurs in maritime and
submaritime climates on moderately dry nitrogen-medium soils [
33].
Some overstory associates of creeping snowberry include big leaf maple
(Acer macrophyllum), California hazel (Corylus cornuta), incense-cedar
(Calocedrus decurrens), red alder (Alnus rubra), white fir (Abies
concolor), red fir (A. magnifica), western hemlock, and Douglas-fir.
Some understory associates include redstem ceanothus (Ceanothus
sanguineus), salal (Gaultheria shallon), red huckleberry (Vaccinium
parvifolium) oceanspray (Holodiscus spp.), rhododendron (Rhododendron
spp.), mahonia (Berberis spp.), currant (Ribes spp.), rattail fescue
(Festuca myuros), and silver hairgrass (Aira caryophyllea) [
3,
4].