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Currently about 2,100 native and 1,300 non-native plant species are known in Pennsylvania. [1] According Pennsylvania Department of Conservation and Natural Resources, the known species make up 37% of Pennsylvania's total wild plant flora. [1] [clarification needed] More non-native species present in Pennsylvania are identified every year.
This category contains the native flora of Pennsylvania as defined by the World Geographical Scheme for Recording Plant Distributions.Taxa of the lowest rank are always included; taxa of higher ranks (e.g. genus) are only included if monotypic or endemic.
Crataegus pennsylvanica, known as the Pennsylvania thorn, [2] is a species of hawthorn native to Delaware, New York, North Carolina, Ontario, Ohio, and Pennsylvania, [2] that grows to about 8 m in height. [2] The mature trees have few thorns. [2]
It is native to the eastern United States. Its range stretches from southern Maine to northern Florida, and west to Indiana and Louisiana. Mountain laurel is the state flower of Connecticut and Pennsylvania. It is the namesake of Laurel County in Kentucky, the city of Laurel, Mississippi, and the Laurel Highlands in southwestern Pennsylvania. [4]
Numerous plants have been introduced to the US state of Pennsylvania in the last four hundred years and many of them have become invasive species that compete with the native plants and suppress their growth.
Native plants growing in the alluvial plain include vervain, jewelweed, boneset, lobelia (including cardinal flower), sedges, aster, Joe-Pye weed, dwarf bluestar, black eyed susan, golden ragwort, goldenrod, red swamp mallow, redtwig dogwood and river birch, and dogwood. Common introduced plants in the alluvial plain include oxeye daisy.
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