These types of plants have life strategies
which are midway between ruderal and stress-tolerant. These types of
plants are deciduous under stress. Circumventors can include about 50%
of the native species; for example, California Fuchsia (Zauschneria
or Epilobium spp.), Monkey Flower (Diplacus or
Mimulus spp.), Buckwheat (Eriogonum
spp.)Fleabane Daisy (Erigeron spp.),
spp.), Penstemon (Penstemon
spp.), some California Lilacs (Ceanothus spp.),
some Sages (Salvia
spp.), Sagebrush (Artemisia
spp.), etc. along with Cottonwood/Poplar/Aspen (Populus spp.),
spp.), etc., along with most of our native annual wildflowers and
perennial and annual native grasses (these plants are browsed hard
seasonally if watered off- season.)
Non-native plants include Rockrose (Cistus
spp.), Lavender (Lavandula spp.), Rosemary (Rosmarinus spp.), Thyme
(Thymus spp.), India-Hawthorn (Rhaphiolepis spp.), Pear (Pyrus spp.),
etc. These plants are harder to grow and you must pay attention to
seasonal issues on native plants.
Also, non-native plants become unstable under high fertility and water
use. In the soil, in the vicinity of the roots of these plants, there
is a ratio of 1 free-living bacterium to 2-4 free-living fungi.
I'd guess the easiest way of telling a ruderal from a circumventor is how long it lives and how well it lives within it's plant community. Ruderals prefer waste areas man has screwed up, circumventors live much longer within a plant community and are very short lived in areas where many has screwed up. Having said that, a ruderal commonly lives one season and a circumventor will still live for a decade on a screwed up site.