CPC National Collection Plant Profile

Tripsacum floridanum

Photographer:
Jennifer Possley

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CPC National Collection Plant Profile

Tripsacum floridanum


Family: 
Poaceae  
Common Names: 
Florida gama grass, Florida mock gamagrass
Author: 
Porter ex Vasey
Growth Habit: 
Graminoid
CPC Number: 
4345

Distribution
Protection
Conservation
References


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Tripsacum floridanumenlarge
Photographer: Jennifer Possley
jpossley[at]fairchildgarden.org
Image Owner: Fairchild Tropical Garden

Tripsacum floridanumenlarge
Photographer: Jennifer Possley
jpossley[at]fairchildgarden.org
Image Owner: Fairchild Tropical Garden


Tripsacum floridanum is Not Sponsored
Primary custodian for this plant in the CPC National Collection of Endangered Plants is: 
Meghan Fellows contributed to this Plant Profile.

 
Tripsacum floridanum


Tripsacum floridanum is a smaller relative of the more common T. dactyloides (Eastern Gamagrass), distinguished primarily by slightly wider leaf blades, usually less than one meter (three feet) tall and usually having solitary spikes (Hitchcock 1951). In southern Florida, T. floridanum is listed as being present in low rocky pinelands (Hitchcock 1951) usually in the shallow soil of crevices (Long and Lakela, 1971). It is also known from Cuba and perhaps other Caribbean islands (de Wet et al. 1976).

Interestingly, and importantly, the genus Tripsacum is known to hybridize with the genus Zea, which is the genus that corn belongs to. The unique genetic traits in the rare Tripsacum floridanum have already been used to develop a strain of corn that is resistant a type of leaf blight. (de Wet et al. 1976, Dewald et al. 1999)

Distribution & Occurrence

State Range
  Florida
State Range of  Tripsacum floridanum
Habitat
  Tripsacum floridanum can be found in the shallow soil of rock crevices in low, rocky pinelands of the Miami Rock Ridge (Hitchcock 1951, Long and Lakela 1971, Wunderlin 1998).

Distribution
  Dade, Collier and Monroe counties in southern Florida (Hitchcock 1951, de Wet et al. 1976, Wunderlin 1998). May also be known in Cuba (de Wet et al. 1976).

Number Left
  Approximately 500 individuals are known from 20 sites.

Protection

Global Rank:  
G2
 
12/24/1997
Guide to Global Ranks
Federal Status:  
SC
 
1/19/1996
Guide to Federal Status
Recovery Plan:  
No
 

State/Area Protection
  State/Area Rank Status Date  
  Florida S2 LE 4/12/1990  

Conservation, Ecology & Research

Ecological Relationships
  Ecological relationships are unknown.

Threats
  Threats to Tripsacum floridanum include urbanization, fire suppression and invasion of exotic species.

Current Research Summary
  • Tripsacum floridanum has been used in genetic studies to help produce disease-resistant strains of crops
(Dewald et al. 1999).
• Fairchild Tropical Gardens is currently propagating this species.

Current Management Summary
  Current management includes prescribed fires and removal of exotic species.

Research Management Needs
  Research needs include further understanding the impact of fire patterns on Tripsacum floridanum and general reproductive biology.

Ex Situ Needs
  Currently, Fairchild Tropical Gardens has an ex situ collection from several sources.

References

Books (Single Authors)

Coile, N.C. 2000. Notes on Florida's Regulated Plant Index (Rule 5B-40), Botany Contribution 38. Gainesville, Florida: Florida Dept. of Agriculture and Consumer Services, Division of Plant Industry.

Hitchcock, A.S.; Chase, A. 1950. Manual of the grasses of the United States. New York: Dover Publications.

Long, R.W.; Lakela, O. 1976. A Flora of Tropical Florida: A Manual of the Seed Plants and Ferns of Southern Peninsular Florida. Coral Gables, FL: University of Miami Press. 962p.

Wunderlin, R.P. 1998. Guide to the vascular plants of Florida. Gainesville, Florida: University Press of Florida. 806p.

Electronic Sources

(2002). Atlas of Florida Vascular Plants. [Web site] University of South Florida Institute for Systematic Botany. http://www.plantatlas.usf.edu/isb/default.htm. Accessed: 2008.

Journal Articles

de Wet, J.M.J.; Gray, J.R.; Harlan, J.R. 1976. Systematics of Tripsacum (Gramineae). Phytologia. 33, 3: 203-227.

Dewald, C.L.; Sims, P.L.; Li, Y.; Sokolov, V. 1999. A novel cytoplasm for maize. Maize Genetics Conference Abstracts. 41: 114.

Larson, S.R.; Doebley, J. 1994. Restriction site variation in the chloroplast genome of Tripsacum (Poaceae): phylogeny and rates of sequence evolution. Systematic Botany. 19, 1: 21-34.

Li. Y.G.; Dewald, C.L.; Sims, P. L. 1999. Genetic relationships within Tripsacum as detected by RAPD variation. Annals of Botany (London). 84, 6: 695-702.

Simone, G.W.; Hooker, A.L. 1976. Monogenic resistance in corn to Helminthosporium turcicum derived from Tripsacum floridanum. Proc. Am. Phytopath. Soc. 3: 207.

USFWS. 1976. Proposed Endangered Status for 1700 U.S. Plants. Federal Register. 41: 24523-24572.

White, S.E.; Doebley, J.F. 1999. The molecular evolution of terminal ear1, a regulatory gene in the genus Zea. Genetics. 153, 3: 1455-1462.


  This profile was updated on 3/4/2010
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