Aristida mohrii - Nash
Mohr's Three-awn Grass
Other English Common Names: Mohr's Three-awn
Other Common Names: Mohr's threeawn
Taxonomic Status: Accepted
Related ITIS Name(s): Aristida mohrii Nash (TSN 41424)
Unique Identifier: ELEMENT_GLOBAL.2.131312
Element Code: PMPOA0K0P0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Grass Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Cyperales Poaceae Aristida
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Aristida mohrii
Taxonomic Comments: Aristida mohrii is quite similar to several other species and thus may be overlooked by botanists. If it were to be listed in all four states in which it occurs, and also actively sought in adjacent Mississippi, its actual distribution and abundance would become much clearer. Few botanists recognize it in the field and so A. mohrii is very likely much more abundant and probably more widely distributed than available data suggest. On the other hand, a number of excellent field botanists have worked the Florida panhandle without encountering A. mohrii, so that one could reasonably conclude that the species is genuinely rare. The remarkably disjunct occurrence in South Carolina was collected in 1939 and correctly identified; there is still much suitable habitat in the general vicinity.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 05May1999
Global Status Last Changed: 28May1999
Rounded Global Status: G1 - Critically Imperiled
Reasons: Very restricted range. Fewer than 8 current populations documented. Clear threats, assuming that we have reasonable knowledge of the species' distribution and habitat preference. Possibly much more abundant than available data suggest, due to being overlooked in the field. Surveys urgently needed.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Alabama (S1), Florida (SNR), Mississippi (S1), South Carolina (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Aristida mohrii has been collected from only nine counties in three states. Alabama: Baldwin, Escambia, and Mobile; Florida: Escambia, Okaloosa, Santa Rosa, Walton, and Washington; South Carolina: Chesterfield. Since 1970, only two collections have been made, in Santa Rosa and Okaloosa Counties, Florida, in 1998 and 1996 respectively. In addition, there are reliable sight records from several locations in Okaloosa and Walton Counties, Florida (Al Schotz pers. comm.). Kartesz (1999) adds Georgia to the range.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: This species is not EO-tracked by any state in its range (Alabama, Florida, Georgia, South Carolina), despite occurring in five or fewer counties in each state. No more than 8 current populations are known. Other knowledgeable botanists who have worked in the panhandle of Florida have not encountered A. mohrii.

Population Size Comments: The known populations contain from 50 to a few hundred individuals each.

Overall Threat Impact Comments: Too little data available to say with certainty. However, like all fire-adapted species of longleaf pine ecosystems, it is very likely that fire-suppression and conversion of habitat are major threats.

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: Too few data are available to say with certainty. However, like all fire-adapted species of longleaf pine ecosystems, it is very likely that it is declining, especially outside of large public properties such as military bases, state and national forests.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Aristida mohrii has been collected from only nine counties in three states. Alabama: Baldwin, Escambia, and Mobile; Florida: Escambia, Okaloosa, Santa Rosa, Walton, and Washington; South Carolina: Chesterfield. Since 1970, only two collections have been made, in Santa Rosa and Okaloosa Counties, Florida, in 1998 and 1996 respectively. In addition, there are reliable sight records from several locations in Okaloosa and Walton Counties, Florida (Al Schotz pers. comm.). Kartesz (1999) adds Georgia to the range.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AL, FL, MS, SC

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
MS Greene (28041)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
03 Lower Chickasawhay (03170003)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Perennial grass growing singly or in small tufts, leaves 10-15 cm long and 1-2 mm wide (often curled into a tight tube when dry); stem very slender, 50-90 cm tall, on the upper half producing a number of solitary, non-overlapping spikelets (flowering/fruiting structures) with three long awns bent 90 degrees from the stem.
Terrestrial Habitat(s): Forest/Woodland, Shrubland/chaparral, Woodland - Conifer
Habitat Comments: Dry to mesic longleaf pine upland flats and sandhills; dry to xeric pine-oak scrub on sandhills and in near- maritime sites. Apparently absent from barrier beac habitats. In dry-mesic communities, longleaf pine is dominant, with a sparse to moderate understory of Quercus margarettiae, Q. falcata, Q. laevis, Q. incana. Shrubs are sparse. Grasses (up to 20 species co-occur) and herbs are abundant. In dry-xeric communities, longleaf is also dominant, but sand pine may be common or locally dominant. Quercus laevis is prominent, with lesser amounts of Q. margarettiae, Q. chapmanii, Q. incana. The herb-grass diversity is much less.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 05May1999
NatureServe Conservation Status Factors Author: B.A. Sorrie (1999)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Allred, K.W. 1986. Studies in the Aristida (Gramineae) of the southeastern United States. IV. Key and conspectus. Rhodora 88: 367-387.

  • Clewell, A.F. 1985. Guide to vascular plants of the Florida panhandle. Florida State Univ. Press, Tallahassee, Florida. 605 pp.

  • Flora of North America Editorial Committee. 2003a. Flora of North America North of Mexico. Vol. 25. Magnoliophyta: Commelinidae (in part): Poaceae, part 2. Oxford Univ. Press, New York. xxv + 781 pp.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Keener, B. R., A.R. Diamond, L. J. Davenport, P. G. Davison, S. L. Ginzbarg, C. J. Hansen, C. S. Major, D. D. Spaulding, J. K. Triplett, and M. Woods. 2016. Alabama Plant Atlas. [S.M. Landry and K.N. Campbell (original application development), Florida Center for Community Design and Research. University of South Florida]. University of West Alabama, Livingston, Alabama. Online. Available: http://floraofalabama.org/Default.aspx

  • Weakley, A.S. 1996. Flora of the Carolinas and Virginia: working draft of 23 May 1996. The Nature Conservancy, Southeast Regional Office, Southern Conservation Science Dept., Chapel Hill, North Carolina. Unpaginated.

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