Hymenoxys texana - (Coult. & Rose) Cockerell
Prairie Dawn
Other Common Names: prairiedawn
Taxonomic Status: Accepted
Related ITIS Name(s): Hymenoxys texana (J.M. Coult. & Rose) Cockerell (TSN 37788)
Unique Identifier: ELEMENT_GLOBAL.2.153540
Element Code: PDAST530L0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Hymenoxys
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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: Hymenoxys texana
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 18Jul2016
Global Status Last Changed: 06May1988
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Endemic to saline prairies with cryptogamic soils within the Houston Coastal Prairie. Although nearly 60 sites are known for this species, almost all are threatened by development from the expanding city of Houston. Many of the sites are within 1 km of each other and probably form a single population. Some sites have been destroyed within a year of their discovery due to development.
Nation: United States
National Status: N2

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 Texas (S2)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (13Mar1986)
U.S. Fish & Wildlife Service Lead Region: R2 - Southwest

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to Fort Bend, Harris, and Trinity County.

Number of Occurrences: 6 - 80
Number of Occurrences Comments: Reported from 61 sites but many of the sites are close enough to make 30 or less occurrences with a 1km separation distance. Reported from La Salle County in the 1800's but the specimen has not been located. There are similarities at the La Salle site with the other sites but no plants have been found there.

Number of Occurrences with Good Viability/Integrity: Few (4-12)
Viability/Integrity Comments: The viability of most sites has not been assessed.

Overall Threat Impact: High
Overall Threat Impact Comments: Habitat destruction for housing development on private land is the primary threat to the species. Many occurrences are on private land in a county that is under rapid development. The construction of a beltway highway is responsible for the extirpation of one site.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to Fort Bend, Harris, and Trinity County.

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.
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U.S. & Canada State/Province Distribution
United States TX

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
TX Fort Bend (48157), Harris (48201), La Salle (48283)*, Trinity (48455)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
12 Middle Neches (12020002)+, West Fork San Jacinto (12040101)+, Spring (12040102)+, Buffalo-San Jacinto (12040104)+, West Galveston Bay (12040204)+, Middle Nueces (12110105)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A delicate annual herb, 5-15 cm high, with small yellow flower heads (only the disc flowers are readily visible) in bloom March-early April.
Duration: ANNUAL
Terrestrial Habitat(s): Grassland/herbaceous
Habitat Comments: Poorly drained, sparsely vegetated areas ("slick spots") at the bases of small mounds (mima or pimple mounds) in open grassland or in almost barren areas. Soils are slightly saline, sticky when wet and powdery when dry. Plant associated include Texas windmill-grass (Chloris texensis) and Houston machaeranthera (Machaeranthera aurea), Thurovia triflora, Valerianella florifera, Willkommia texana var. texana, and Atriplex texana (Singhurst 2014).
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: 18Jul2016
NatureServe Conservation Status Factors Author: Roth, E., rev. Poole/Maybury (1996), rev. Treher (2016)

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
Help
  • Correll, D.S., and M.C. Johnston. 1970. Manual of the vascular plants of Texas. Texas Research Foundation, Renner. 1881 pp.

  • Flora of North America Editorial Committee. 2006c. Flora of North America North of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 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.

  • Poole, Jackie M., W. R. Carr, D. M. Price, and J. R. Singhurst. 2007. Rare plants of Texas. Texas A&M University Press, College Station. 640 pp.

  • Singhurst, JR, N. Shackelford, W. Newman, J.N. Mink, and W.C. Holmes. 2014. The ecology and abundance of Hymenoxys texana (Asteraceae). Phytoneuron 2014-19:1?19.

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