Styrax platanifolius ssp. texanus - (Cory) P.W. Fritsch
Texas Snowbell
Synonym(s): Styrax texanus Cory
Taxonomic Status: Accepted
Related ITIS Name(s): Styrax platanifolius ssp. texanus (Cory) P.W. Fritsch (TSN 566099)
Unique Identifier: ELEMENT_GLOBAL.2.152043
Element Code: PDSTY02044
Informal Taxonomy: Plants, Vascular - Flowering Plants - Other flowering plants
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Ebenales Styracaceae Styrax
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Concept Reference
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Concept Reference: Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Styrax platanifolius ssp. texanus
Taxonomic Comments: Recognized as the distinct species Styrax texanus in Kartesz (1994) and by the U.S. Fish and Wildlife Service.
Conservation Status
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NatureServe Status

Global Status: G3T1
Global Status Last Reviewed: 16Jan2002
Global Status Last Changed: 06May1988
Rounded Global Status: T1 - Critically Imperiled
Reasons: There is only a single population that is successfully reproducing (i.e., with adequate numbers of seedlings and juvenile plants, as well as reproductive adults). The other populations have few adult plants and very few, if any, juveniles. Two introduced populations are still growing in cages. This subspecies is highly attractive to grazing and browsing animals and its habitat is severely overgrazed by feral goats, white-tailed deer, non-native sheep, and other ungulates. The largest, healthiest population is on a preserve of The Nature Conservancy.
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 Texas (S1)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (12Oct1984)
U.S. Fish & Wildlife Service Lead Region: R2 - Southwest

NatureServe Global Conservation Status Factors

Range Extent Comments: Edwards, Real, Kimble, (Val Verde) counties, Texas.

Number of Occurrences: 6 - 20

Population Size Comments: 25 individuals known to exist (9/24/84).

Overall Threat Impact Comments: Region is heavily overgrazed by sheep, goats and cattle; also exotic ungulates; streambank erosion due to flooding.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Edwards, Real, Kimble, (Val Verde) counties, Texas.

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 TX

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
TX Edwards (48137), Real (48385), Uvalde (48463), Val Verde (48465)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
12 Nueces headwaters (12110101)+, Upper Frio (12110106)+
13 Lower Devils (13040302)+, Dry Devils (13040303)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A shrub, usually with several stems from the base, up to 4 m tall. Produces showy white flowers borne in clusters among the rounded, bright green leaves with white undersurfaces. Blooms primarily in April.
Palustrine Habitat(s): Riparian
Terrestrial Habitat(s): Bare rock/talus/scree, Cliff, Forest/Woodland, Woodland - Mixed
Habitat Comments: Pockets of rocky clay soils or crevices in limestone cliffs, bluffs, and ledges above permanent streams or rivers or above rocky stream beds with high water tables. (The steep areas are probably not the plant's primary habitat, but are refuges from extreme livestock grazing pressure.) The surrounding vegetation is sycamore-little walnut (Platanus occidentalis-Juglans microcarpa), oak, or oak-juniper woodland.
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: 11Mar1985
NatureServe Conservation Status Factors Author: Brown, B.A.; rev. Poole/Maybury, 1996.

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
  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Lowe, D.W., J.R. Matthews, and C.J. Moseley, eds. 1990. The official World Wildlife Fund guide to endangered species of North America. Beacham Publishing, Washington, D.C. 1180 pp.

  • 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.

  • U.S. Fish and Wildlife Service. 1984. 50 CFR Part 17, Endangered and threatened wildlife and plants; final rule to determine Styrax texana (Texas snowbells) to be an endangered species. Federal Register 49(199):40036-40038. 12 October 1984.

  • U.S. Fish and Wildlife Service. 1984. Final rule to determine Styrax texana (Texas snowbells) to be an endangered species. Federal Register 49(199): 40036-40038.

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