Leptodactylon caespitosum - Nutt.
Matted Prickly-phlox
Other English Common Names: Mat Prickly-phlox
Other Common Names: mat prickly phlox
Synonym(s): Linanthus caespitosus (Nutt.) J.M. Porter & L.A. Johnson
Taxonomic Status: Accepted
Related ITIS Name(s): Leptodactylon caespitosum Nutt. (TSN 31239)
Unique Identifier: ELEMENT_GLOBAL.2.159870
Element Code: PDPLM08010
Informal Taxonomy: Plants, Vascular - Flowering Plants - Phlox Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Solanales Polemoniaceae Leptodactylon
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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: Leptodactylon caespitosum
Conservation Status
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NatureServe Status

Global Status: G4
Global Status Last Reviewed: 18May1999
Global Status Last Changed: 27Dec1999
Rounded Global Status: G4 - Apparently Secure
Reasons: There are at least 60 locations in 20 counties in 6 states. Given the wide distribution of this species, it is likely that there are many additional occurrences yet to be documented.
Nation: United States
National Status: N4

U.S. & Canada State/Province Status
United States Colorado (SNR), Montana (S2), Nebraska (S1), Nevada (SNR), Utah (S2), Wyoming (S3)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: This species is reported from Colorado, Nebraska, and Nevada (Kartesz and the Biota of North America Program 1998). It is also reported from Daggett, Emery, Garfield, Juab, Millard, and Sanpete counties in Utah (Welsh et al. 1993), in Carbon County, Montana (Montana Natural Heritage Program 1999), and in Lincoln, Goshen, Sweetwater, Fremont, Laramie, Hot Springs, Washakie, Carbon, Big Horn, and Converse counties in Wyoming (pers. comm. Walt Fertig WYNDD 1999 to Kim Fayette).

Number of Occurrences: 21 - 80
Number of Occurrences Comments: There are approximately 60 occurrences documented from 5 of the 6 states reported to include this species. Nebraska NHP has 3 occurrences for this species (pers. comm. Gerry Steinauer 1999 to Kim Fayette). There are 12 occurrences in Montana (Montana Natural Heritage Program 1999). There are 7 Colorado specimens at the CSU Herbarium from Moffat and Weld counties (Colorado State University Herbarium 1999), and this species is also reported from Mesa de Maya, in Las Animas County, Colorado (Weber and Wittmann 1996). There are 25-30 occurrences in Wyoming (pers. comm. Walt Fertig WYNDD 1999 to Kim Fayette). This species is ranked an S2 in Utah although the UTNHP does not have any occurrences in their database at this time (pers. comm. Ben Franklin UTNHP 1999 to Kim Fayette). It is assumed that there are at least 6 occurrences based on this rank. There is no locational information available for Nevada.

Population Size Comments: Only one Nebraska occurrence includes information about abundance, it mentions 50 individuals with all plants copiously flowering (pers. comm. Gerry Steinauer NE NHP 1999 to Kim Fayette). Weber and Wittmann (1996) mention that this species is uncommon in Colorado. This species can be fairly local and small in size however it can be one of the dominant cushion plant species in sparse vegetation types on chalky or silty ridgecrests (pers. comm. Walt Fertig WYNDD 1999 to Kim Fayette). Over 5,000 plants observed in Montana, occupying habitat over 40 acres.

Overall Threat Impact Comments: Livestock and horse grazing have limited if any affects.

Short-term Trend: Unknown

Intrinsic Vulnerability Comments: The harsh, rocky, barren setting is resilient but some substrates are friable and affected by surface disturbance.

Other NatureServe Conservation Status Information

Distribution
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Global Range: This species is reported from Colorado, Nebraska, and Nevada (Kartesz and the Biota of North America Program 1998). It is also reported from Daggett, Emery, Garfield, Juab, Millard, and Sanpete counties in Utah (Welsh et al. 1993), in Carbon County, Montana (Montana Natural Heritage Program 1999), and in Lincoln, Goshen, Sweetwater, Fremont, Laramie, Hot Springs, Washakie, Carbon, Big Horn, and Converse counties in Wyoming (pers. comm. Walt Fertig WYNDD 1999 to Kim Fayette).

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CO, MT, NE, NV, UT, WY

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
MT Carbon (30009)
NE Scotts Bluff (31157)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Big Horn Lake (10080010)+, Middle North Platte-Scotts Bluff (10180009)+, Horse (10180012)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Leptodactylon is a cushion-forming perennial with a highly branched rootcrown that gives rise to numerous herbaceous stems that are up to 2 cm high. Each stem is closely covered by opposite, deeply 2-3 equally-lobed, spine-tipped leaves that are 3-6 mm long. The foliage is glabrous to glandular. Solitary flowers are borne on the stem tips. The pinkish-white, tubular corolla is 12-20 mm long and flares into 4 spreading lobes. 4 anthers are borne near the top of the tube, and the calyx is 5-8 mm long with 4 shallow, pointed lobes. The fruit is a round capsule.
Diagnostic Characteristics: L. PUNGENS is a taller subshrub. Mat forming species of PHLOX have flowers with a 5-lobed calyx and corolla.
Habitat Comments: This species is found mostly on barren, alkaline clay or shale bluffs, knolls, and flats, and also on calcareous tufa about hot springs (Cronquist et al. 1984). It is found within sagebrush, pinyon-juniper, ponderosa pine, and bristlecone pine communities at 1675 to 2350 meters (Welsh et al. 1993). The Great Plains Flora Association (1986) reports the habitat for this species to be dry rocky soils or in crevices of outcrops.
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: 18May1999
NatureServe Conservation Status Factors Author: Fayette, Kim and Susan Spackman.
Element Ecology & Life History Edition Date: 31Oct1994
Element Ecology & Life History Author(s): JM

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
  • Colorado State University Herbarium. 1999. "Colorado State University Herbarium Database". http://www.colostate.edu/Depts/Biology/Herbarium/ database.html. (May 15 1999).

  • Kartesz, J., and the Biota of North America Program (BONAP). 1998. A Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands. http://plants.usda.gov.

  • 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.

  • 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.

  • Lesica, P. and P. L. Achuff. 1992. Distribution of vascular plant species of special concern and limited distribution in the Pryor Mountain desert, Carbon County, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program, Helena, MT. 105 pp.

  • Lichvar, R. W., Dorn, R. D. and E. F. Evert. 1983. New records for the vascular flora of Wyoming and Montana. The Great Basin Naturalist 43(4):739-740.

  • Montana Natural Heritage Program. 1999. Biological Conservation Database. http://nris.state.mt.us/mtnhp. (May 15 1999).

  • Weber, W.A., and R.C. Wittmann. 1996a. Colorado flora: Eastern slope. Revised edition. Univ. Press of Colorado, Niwot, Colorado. 524 pp.

  • Welsh, S.L., N.D. Atwood, S. Goodrich, and L.C. Higgins (eds.) 1993. A Utah flora. 2nd edition. Brigham Young Univ., Provo, Utah. 986 pp.

  • citation currently unavailable in central databases; housed at Heritage program

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