Table 1.

Percentage of woody and herbaceous plant cover within six community types identified along electrical transmission rights-of-way in western Washington and Oregon. Values indicate the range of cover estimates recorded for each species in a given community type and a given study site.

CommunityVegetationTCW (%)CRG (%)WF (%)
Alder
Red alderAlnus rubra10–80——
Broom
Scotch broomCystisus scoparius—7–4012–80
Herbs
GrassesPoaceae8–355–405–65
ForbsForbs, various1–61–101–10
Bracken fernPteridium aquilinum2–102–101–5
ThimbleberryRubus parviflorus5–20——
Herb/shrub
GrassesPoaceae1–102–75–15
ForbsForbs, various3–123–103–10
Bracken fernPteridium aquilinum3–202–1040–80
Trailing blackberryRubus ursinus15–402–815–25
Sword fernPolystichum munitum2–1015–3540–55
SnowberrySymphoricarpus albus——7–15
SalalGaultheria shallon8–155–1535–65
Oregon grapeBerberis nervosa1–8——
SalmonberryRubus spectabilis1–11——
Shrub
SnowberrySymphoricarpus albus—15–607–85
ThimbleberryRubus parviflorus15–3012–5015–35
SalalGaultheria shallon15–9515–4535–65
Oregon grapeBerberis nervosa10–40——
SalmonberryRubus spectablilis10–50——
Tree and tall shrub
HazelCorylus cornuta—11–7020–100
Vine mapleAcer circinatum15–8025–9650–75
CascaraRhamnus purshiana—15–4520–60
Bigleaf mapleAcer macrophyllum—15–35—

  • TCW = Tacoma City Watershed; CRG = Columbia River Gorge; WF = Willamette foothills.