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A list of invasive plant species in California. Numerous plants have been introduced to the California Floristic Province and within the state's borders. Many of them have become invasive species and/or noxious weeds. The following are some of these species:
The leaves are opposite, simple, ovate or oblong, 7.5 to 20 centimetres (3.0 to 7.9 in) long and 2.5 to 10 centimetres (0.98 to 3.94 in) broad, with a petiole 2 centimetres (0.79 in) long, and an entire margin; they are hairless above, and finely downy below, particularly along the veins, and turn yellow in fall.
California also has 1,023 species of non-native plants, some now problematic invasive species such as yellow starthistle, that were introduced during the Spanish colonization, the California Gold Rush, and subsequent immigrations and import trading of the 18th, 19th and 20th centuries.
The fringe tree grows from Canada all the way down to the Gulf Coast. It's tougher than dogwood, more dependable than saucer magnolia, longer-lived than cherry, has wonderfully fragrant blooms ...
[5]: 99 Lemmon's draba, (Draba lemmonii), is hairy and mat forming, and covered in clusters of lemon yellow flowers that may look like patches of lichens from a distance, [4]: 224 since it grows in rock crevices and rock ledges. [5] [6]: 224 Its leaves are hairy, but are greener than the typical gray wooly leaves of many alpine plants.
Black gum, bald cypress, dawn redwood and a host of oaks including live, shumard, scarlet, swamp chestnut, white and willow are great long-term trees that will get some shade going eventually. And ...
Most exotic plants in California are currently restricted to low elevations, although some invasive species may have the potential to reach the subalpine zone. If climate change does indeed warm regions where the subalpine zone occurs, conditions there may become more conducive to threats such as invasive species as the local ecosystem is ...
Chorizanthe howellii, a flowering plant in the buckwheat family found only near Fort Bragg; Cuscuta pacifica var. papillata, a parasitic plant found only in the salt marshes of Mendocino county