Hoffmannseggia tenella - Tharp & Williams
Slender Rushpea
Taxonomic Status: Accepted
Related ITIS Name(s): Hoffmannseggia tenella Tharp & Williams (TSN 503050)
Unique Identifier: ELEMENT_GLOBAL.2.147351
Element Code: PDFAB20050
Informal Taxonomy: Plants, Vascular - Flowering Plants - Pea Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Fabales Fabaceae Hoffmannseggia
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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: Hoffmannseggia tenella
Taxonomic Comments: Distinct species, first collected by Mrs. F.E. Clements in 1931.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 16Jan2002
Global Status Last Changed: 26Mar1984
Rounded Global Status: G1 - Critically Imperiled
Reasons: Currently known from 5-6 sites in south Texas. (In 1984 there were only 3 individual plants of this species known to survive, but in 1985 an additional site - the un-manicured grounds of an old cemetary - were found to harbor a population of about 10,000 plants. In the early 1990s, a satellite population was found on a highway right-of-way near the cemetery and 3 more sites were found on a National Guard tract.) The Gulf Prairie habitat on which this species depends has been largely destroyed or greatly altered by development (both by urbanization and the oil and gas industry), conversion to agricultural and grazing land, and the introduction of exotic plants. This low-growing species is particularly threatened by non-native, invasive, tall grasses that have replaced much of the native vegetation in the region. Hoffmannseggia tenella now occurs only in "refuge" areas where native grasses still predominate, or in places subject to frequent mowing.
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 (01Nov1985)
U.S. Fish & Wildlife Service Lead Region: R2 - Southwest

NatureServe Global Conservation Status Factors

Range Extent Comments: Historically known from Nuceces and Kleberg Counites, Texas. Presently only known from Nueces County.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Five-six populations known.

Population Size Comments: Population near Petronila Creek and state highway 70 has ca. 28 plants; over 10,000 individuals at the second site.

Overall Threat Impact Comments: Introduced grass species, agricultural development, grazing, and habitat alteration.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Historically known from Nuceces and Kleberg Counites, Texas. Presently only known from Nueces 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.
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 Kleberg (48273), Nueces (48355)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
12 South Corpus Christi Bay (12110202)+*, San Fernando (12110204)+, Baffin Bay (12110205)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A delicate perennial herb, 8-15 cm tall, with salmon-colored flowers that usually begin blooming in the spring and then appear sporadically thereafter in response to adequate rainfall.
General Description: A perennial in the pea family with stems 8 to 15 cm tall and terminating in 3 to 5 flowered inflorescences without glands. The flowers are orange and the pods are 12-15 mm x 4-6 mm containing 2-4 seeds. (Stout and McDonald, 1985)
Technical Description: "Glabrate or inconspicuously puberulent eglandular perennial with clustered, spreading, filiform stems 0.8-2 cm from a woody taproot. Leafstalk 4-6 cm, rachis much shorter than petiole; pinnae (1-) 2-3 pairs plus 1; leaflets 5-7 pairs, subsessile, elliptic or ovate, 2-4 mm, 1.8-2.4 r, glabrate, midvein usually discernable. Stipules ovate, ca 2 mm. Flowers 3-6 in exserted, lax racemes. Pedicels 2-3 mm; calyx lobes valvate, equal, oblong, 2.5-3 mm, puberulent; petals yellow-pink ("coral"), obovate, 4-6 mm; filaments slightly ciliate. Legume oblong, straight, flat, 10-14 mm long, 4-6 mm wide; valves eglandular, glabrate, reticulate, becoming segmented, the margins puberulent. Seeds 2-4." (Isely, 1975)
Diagnostic Characteristics: Hoffmannseggia tenella may be characterized by legume straight, 10-14 mm; petiole much exceeding rachis; plants caulescent, usually glabrate. S. Texas. (Isely, 1975)
Duration: PERENNIAL
Terrestrial Habitat(s): Grassland/herbaceous
Habitat Comments: Sparsely vegetated openings within bluestem-sacahuista grasslands on heavy clay soils of the South Texas Coastal Plain. Occassionally on creek banks.
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: 13Oct1987
NatureServe Conservation Status Factors Author: Roth, E., rev. Poole/Maybury (1996)
Element Ecology & Life History Edition Date: 26Jun1992

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

  • Isely, D. 1975. Leguminosae of the U.S.: II. Subfamily Caesalpinoideae. Memoirs New York Botanical Garden 25(2): 1-228.

  • 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, J.M., and D.H. Riskind. 1987. Endangered, threatened, or protected native plants of Texas. Texas Parks Wildlife Dept., Austin, TX.

  • 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. 1985. Listing Hoffmannseggia tenella as an endangered species. Federal Register 50(212): 45614-45618.

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