Erythronium taylorii - Shevock & Allen
Taylor's Fawnlily
Taxonomic Status: Accepted
Unique Identifier: ELEMENT_GLOBAL.2.145433
Element Code: PMLIL0U0S0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Lily Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Liliales Liliaceae Erythronium
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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: Erythronium taylorii
Taxonomic Comments: This taxon has evident affinities to other Californian Erythronium with unmottled leaves, especially E. pusaterii. Accepted by Kartesz (1999), with spelling 'taylorii' (the name was published in Madro44: 359-363 as 'taylori').
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 23Dec2015
Global Status Last Changed: 29Sep1998
Rounded Global Status: G1 - Critically Imperiled
Reasons: Erythronium taylorii is endemic to California. Known only from the type locality in Toulumne county, where the population is estimated to have at least 1,000 plants. Although additional surveys might discover more populations, this species is probably a localized endemic and so far the rarest of the Sierra Nevada Erythronium taxa. Rock climbing and poaching are both potential threats to this species.
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 California (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: California endemic: Toulumne county, Ascension Mountain, South Fork Toulumne River basin in the Stanilaus National Forest. Only one occurrence is known, but others may exist.

Area of Occupancy: 1-25 4-km2 grid cells
Area of Occupancy Comments: There is only one site known, but there could be more.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Currently known only from the type locality. Although additional occurrences may be found in futher surveys, this species is probably a localized endemic (Shevoc & Allen, 1997). As of 2004, the type location was the only known location.

Population Size Comments: The population is estimated to consist of at least a thousand plants (Shevock and Allen, 1997).

Number of Occurrences with Good Viability/Integrity: None (zero)
Viability/Integrity Comments: Given that the location of this species is difficult to get to, it is expected that the type locality will persist over the next 20 years.

Overall Threat Impact: Low
Overall Threat Impact Comments: This species grows in pockets of soil in rocks and at the base of cliffs in an areas where rock climbing is a popular sport. As of 2004 rock climbing hasn't been documented as a direct threat but it is potential threat. This species is also highly attractive with a sweet fragrance and collecting for the nursery trade or rock gardening could become a problem in the future as well (pers. comm. Jennie Haas). Overall, this species grows in a rugged area that is not easily accessed and this is partly why there aren't more threats to the species.

Short-term Trend: Unknown
Short-term Trend Comments: No information about the short term trends of this species are known since it was only discovered in 1996. (pers. comm. Jennie Haas).

Long-term Trend: Unknown
Long-term Trend Comments: The long term trends of this species are unknown. In 1987 there was a wildfire in the area started by lightening and it burned at a low to moderate intensity where this lily occurs. The lily didn't seem to be affected by the wildfire (pers. comm. Jennie Haas). Since there is no data on this species before the fire, it is impossible to speculate about the long term trends.

Intrinsic Vulnerability Comments: Given that this lily is both rare and endemic, it is probably a safe assumption that it is to some extent intrinsically vulnerable. Little is known about the percent of seeds that are viable or whether it take a long time to reach maturity. As of Nov. 2004 there have been no monitoring studies conducted to gather this kind of data (pers. comm. Jennie Haas).

Seeds have been collected and planted, and the seeds sprouted, and produced healthy looking plants. These healthy looking plants, however, have never flowered even after many years, which may suggest that the species is slow to mature, but this may also be because the seeds weren't planted in soil that while produced healthy looking plants isn't conducive for flowering (pers. comm. Jennie Haas). Studies of measure fecundity and length of time to maturity are needed.

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: While the factors that make up the microhabitat where this species grows have not been identified, it is suspected that this species will be a local endemic. Shevlock and Allen 1997 say the following, "Although additional occurrences may be found in futher surveys, this species is probably a localized endemic". In addition, this species is known to occur in an area with ample early season moisture, moderate summer temperatures, cool winters (Shevock and Allen 1997). Further still, botanist Jennie Hass, has observed that this species only grows in pockets of soil in certain types of rock and at the base of the cliffs but only to about 10ft past the base, and not into the forest beyond the base (pers. comm.).

Other NatureServe Conservation Status Information

Distribution
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Global Range: California endemic: Toulumne county, Ascension Mountain, South Fork Toulumne River basin in the Stanilaus National Forest. Only one occurrence is known, but others may exist.

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 CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Mariposa (06043), Tuolumne (06109)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Upper Merced (18040008)+, Upper Tuolumne (18040009)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Herbaceus plant with two light-green leaves 18-32 cm long; flowering scapes 25-40 cm tall; 1-8 fragrant, nodding, bicolor flowers per plant (bright yellow at the base and cream-white on the terminal portion).
Terrestrial Habitat(s): Bare rock/talus/scree, Forest - Mixed, Forest/Woodland
Habitat Comments: It occurs on steep metamorphic rock outcrops in Douglas fir-mixed conifer-black oak forest, on aortheast slope below Pilot Ridge at 1340 to 1400 m. It forms relatively large colonies on rock terraces, ledges and crevices with sufficiently deep soil. This habitat receives some snow but lacks a deep winter snowpack. Plants were observed at the bases of rock outcrops, but not in adjacent forest (Shevock & Allen, 1997). n
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: 13May2005
NatureServe Conservation Status Factors Author: Martinez, M. (TNCHQ), rev. (2004) L. Oliver; rev. R. Bittman 5/2005
Element Ecology & Life History Edition Date: 29Sep1998

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
  • Flora of North America Editorial Committee. 2002a. Flora of North America North of Mexico. Vol. 26. Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford Univ. Press, New York. xxvi + 723 pp.

  • 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.

  • Shevock, J. R. and G. A. Allen. 1998. Erythronium taylori (Liliaceae), a new species from the central Sierra Nevada of of California. Madroņo 44(4): 359-363.

  • Shevock, J.R., and G.A. Allen. 1997. Erythronium taylori (Liliaceae), a new species from the central Sierra Nevada of California. Madrono 44(4): 359-363.

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