Extinct Plants of northern North America 2018

I'm limiting this list to northern North America for two reasons:

1. Restricting this list geographically is in keeping with my specialization in plants native to northeastern North America.
2. There are many more tropical plants, and plant extinctions, than I can manage; for example, Cuba alone has lost more plant species than I've listed on this blog post. 

If you have additions to this list, please let me know, and provide a link which I can research.

• Astilbe crenatiloba, Roan Mountain false goat's beard, Roan Mountain, Tennessee, 1885
• Narthecium montanum, Appalachian Yellow Asphodel, East Flat Rock Bog, Henderson County, North Carolina, before 2004?
• Neomacounia nitida, Macoun's shining moss, Belleville, Ontario, 1864
• Orbexilum macrophyllum, bigleaf scurfpea, Polk County, North Carolina, 1899
• Orbexilum stipulatum, large-stipule leather-root, Falls-of-the-Ohio scurfpea, Rock Island, Falls of the Ohio, KY, 1881
• Thismia americana, banded trinity, Lake Calumet, IL, 1916

Extinct in the wild (IUCN Red List code EW)

Franklinia alatamaha, Franklin Tree

Extinct versus Extirpated

I often come across misuse of the word "extinct," as in: native plant extinct in New York City.

• "Extinct" means globally extinct. No living specimens exist anywhere in the world, not even in cultivation. 
• "Extirpated" means locally extinct, while the species persists in other populations outside of the study area. To correct the above example: extirpated in New York City. Any regional Flora lists many extirpated species.

When a species is known only from one original or remaining population, as those listed above were, loss of that population means extinction for the species. In this case, extirpation and extinction are the same thing.

Another category is "extinct in the wild," when the species still exists under cultivation, like an animal in a zoo. A famous example of this is Franklinia alatamaha.

Related Content

Extinct Plants of northern North America 2015, 2015-11-29
Extinct Plants of northern North America, 2014-11-30

Links

Wikipedia: List of extinct plants: Americas
IUCN Red List: List of species extinct in the wild
The Sixth Extinction: Recent Plant Extinctions
Extinct and Extirpated Plants from Oregon (PDF, 5 pp)