Where Listed: WHEREVER FOUND
Geocarpon MacKenzie is a monotypic genus originally described by K.K. MacKenzie (1914). It is placed in the family Caryophyllaceae. Currently no studies describe the genetic variability among geographically isolated populations and populations that occur in differing habitats (sandstone glades vs. saline prairies/barrens). Researchers at the Missouri Botanical Gardens have begun the process of extracting DNA and developing protocols for genetic analysis using existing material in their collection. Additional tissue samples and analysis are needed to characterize the genetic variability among distinct populations.
- States/US Territories in which the Geocarpon minimum is known to or is believed to occur: Arkansas , Louisiana , Missouri , Texas
- US Counties in which the Geocarpon minimum is known to or is believed to occur: View All
- Countries in which the the Geocarpon minimum is known to occur: United States
|Status||Date Listed||Lead Region||Where Listed|
|06/16/1987||Southeast Region (Region 4)|
» Federal Register Documents
|04/10/1986||51 FR 12460 12463||Thr. Status Proposed for Geocarpon minimum; 51 FR 12460-12463|
|09/23/2014||79 FR 56821 56823||5-Year Status Reviews of 27 Southeastern Species; Notice of initiation of reviews; request for information|
|06/16/1987||52 FR 22930 22933||Thr. Status for Geocarpon minimum; 52 FR 22930-22933|
|07/26/2005||70 FR 43171 43173||5-Year Review of 13 Southeastern Species|
|Date||Title||Plan Action Status||Plan Status|
|07/26/1993||Geocarpon minimum||View Implementation Progress||Final|
|Date||Citation Page||Title||Document Type|
|09/23/2014||79 FR 56821 56823||5-Year Status Reviews of 27 Southeastern Species; Notice of initiation of reviews; request for information||
|07/26/2005||70 FR 43171 43173||5-Year Review of 13 Southeastern Species||
|07/20/2016||Geocarpon minimum (Geocarpon): 5-Year Review: Summary and Evaluation|
|07/01/2009||Geocarpon minimum (no common name) 5-Year Review|
» Critical Habitat
No critical habitat rules have been published for the .
» Conservation Plans
No conservation plans have been created for .
» Life History
The range of Geocarpon has been extended into northwestern Louisiana and eastern Texas and the habitat at these sites appears similar to that described in the recovery plan for known sites in Arkansas and northcentral Louisiana. All populations outside Missouri are associated with “slick spots” within saline soil prairies. In Missouri sandstone glades it colonizes shallow depressions within rocks that provide poor habitat for most other herbaceous species. No populations have been found in sandstone glades outside of Missouri.
Movement / Home Range
Geocarpon is an annual that is usually easily visible for only three to six weeks during the spring. The flowering and fruiting period when the plant is usually most visible ranges from late February to early June. The flowering date appears to be earlier in the southern range presumably due to milder temperatures. March and April are the most common survey dates reported throughout the range and this likely corresponds to the peak flowering period. The factors affecting the timing and success of germination are not fully understood, although many researchers suggest that temperature and weather conditions are the two primary factors. During dry years, the number of observed plants often plummets to few or none only to return to previous numbers in subsequent wet years. This indicates that seeds remain viable for several years or more. The factor that appears to most affect the long-term reproductive success and persistence of Geocarpon populations is competition with and shading by other native or invasive plants. This is attributed by some researchers to a lack of slick spot or sandstone glade disturbance by fire, large mammals, or other erosive forces. The amount of disturbance required to maintain suitable Geocarpon habitat without negatively impacting the long-term viability of populations is unclear.
» Other Resources
NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.
ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.
FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.