Map Color Key:
| STATE COLOR KEY | COUNTY COLOR KEY | |||
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Species present in state and native
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Species present and not rare | Species extinct | Species native, but adventive in state | Species waif |
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Species present in state and exotic |
Species present and rare
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Species noxious (includes noxious-weed seeds) | Species eradicated | |
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| Species not present in state | Species extirpated (historic) | Species exotic and present | Questionable Presence (cross-hatched) | |
In some cases, individual species maps will have multiple colors regarding nativity [e.g., Chenopodium album, dark olive green (native), orange (native historic), teal (adventive), and also dark navy blue (exotic)]. This map suggests that in various U.S. states, at least one infraspecific taxon of the species complex is native, another is exotic, a third is adventive and the fourth rare. Once published, the Floristic Synthesis will show state-level nativity and rarity for each infraspecific taxon, however, for this website, we have provided only full species-level maps.
In our county-level maps, dark green for state color indicates that the plant is native to North America (north of Mexico). To determine nativity for a particular state, you must look at the color of the counties within each state. If counties within the state are bright green (against dark green state color), the plant is native to that state. If county is teal (against dark green state color), the plant is adventive. For example, Amaranthus blitoides is native to North America. It is adventive to western and eastern US states (counties are scored with teal color). but is native to states in the “middle” of the US, such as Kansas, Nebraska, Colorado, Texas (counties are bright green).
Last updated October 19, 2012.
