Draba globosa - Payson
Rockcress Draba
Synonym(s): Draba apiculata C. L. Hitchc. ;Draba densifolia var. apiculata (C. L. Hitchc.) Welsh
Taxonomic Status: Accepted
Related ITIS Name(s): Draba globosa Payson (TSN 502122)
Unique Identifier: ELEMENT_GLOBAL.2.135778
Element Code: PDBRA11350
Informal Taxonomy: Plants, Vascular - Flowering Plants - Mustard Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Capparales Brassicaceae Draba
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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: Draba globosa
Conservation Status
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NatureServe Status

Global Status: G3
Global Status Last Reviewed: 12Jan2009
Global Status Last Changed: 20Oct1994
Rounded Global Status: G3 - Vulnerable
Reasons: Draba globosa is known from Colorado, Montana, Wyoming, Utah and Idaho. There are approximately 40 occurrences extant globally. This species may be primarily protected from human threats by its inaccessible habitat.
Nation: United States
National Status: N3

U.S. & Canada State/Province Status
United States Colorado (S1), Idaho (S2), Montana (S2S3), Utah (S2), Wyoming (S2S3)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Regional endemic of southwestern Montana, central Colorado, northern Utah and western and southern Wyoming.

Number of Occurrences: 21 - 80
Number of Occurrences Comments: Colorado has three occurrences documented from three counties (CNHP 1998). There are five occurrences documented in Idaho, last seen between 1978-1996 (ICDC 1998). There are four occurrences in Montana (MTNHP 1999). Wyoming NDD (1998) reports 17 occurrences, at least 9 of which have been documented since 1990. There are approximately 6 to 15 occurrences in Utah.

Population Size Comments: Only one of the three Colorado occurrences reports individual numbers (50) (CNHP 1998). One of the Montana occurrences reports 500-1000 individuals but another reports this species as uncommon (MTNHP 1998). Wyoming NDD (1998) states that most populations are small.

Overall Threat Impact: Medium
Overall Threat Impact Comments: An assessment for the U.S. Forest Service suggested that recreational use may threaten some populations (Holmgren et al. 2005). This species may be primarily protected from human threats by its inaccessible habitat (WYNDD 1998).

Short-term Trend: Unknown
Short-term Trend Comments: Trend information is not available.

Intrinsic Vulnerability Comments: The habitat is relatively resilient.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Regional endemic of southwestern Montana, central Colorado, northern Utah and western and southern Wyoming.

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

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

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CO Clear Creek (08019), Gunnison (08051)*, Lake (08065)*, Pitkin (08097), Summit (08117)
ID Custer (16037), Lemhi (16059)
MT Beaverhead (30001), Madison (30057)
UT Daggett (49009)*, Duchesne (49013), Juab (49023), Salt Lake (49035), Summit (49043), Uintah (49047)*, Utah (49049), Wasatch (49051)*
WY Albany (56001), Carbon (56007), Fremont (56013), Lincoln (56023), Park (56029), Sublette (56035), Teton (56039)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Red Rock (10020001)+, Madison (10020007)+, Gallatin (10020008)+, Clarks Fork Yellowstone (10070006)+, Upper Wind (10080001)+, Little Wind (10080002)+, Popo Agie (10080003)+, Greybull (10080009)+, Medicine Bow (10180004)+, Upper Laramie (10180010)+, Upper South Platte (10190002)+, Clear (10190004)+
11 Arkansas Headwaters (11020001)+*
14 Blue (14010002)+, Roaring Fork (14010004)+, East-Taylor (14020001)+*, Tomichi (14020003)+*, Upper Green (14040101)+, New Fork (14040102)+, Upper Green-Flaming Gorge Reservoir (14040106)+, Blacks Fork (14040107)+*, Ashley-Brush (14060002)+*, Duchesne (14060003)+*
16 Upper Bear (16010101)+*, Central Bear (16010102)+, Utah Lake (16020201)+, Provo (16020203)+*, Jordan (16020204)+, Southern Great Salt Lake Desert (16020306)+
17 Snake headwaters (17040101)+, Gros Ventre (17040102)+, Greys-Hobock (17040103)+, Salt (17040105)+, Teton (17040204)+, Birch (17040216)+, Little Lost (17040217)+, Big Lost (17040218)+, Upper Salmon (17060201)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Plants forming cushions with many short caudices, each topped by a cluster of broad, short, incurved glabrous or ciliate leaves, forming minute cabbagelike heads. Styles are very short (0.15 mm or less) and seeds are small (less than 1mm).
General Description: Round-fruited Draba is a small, stemless, herbaceous perennial, which forms cushions that are up to 20 cm wide and which consist of basal leaf rosettes that arise from a branched rootcrown. The lance-shaped to narrowly spoon-shaped leaves are 3-6 mm long and have a few stiff marginal hairs but are otherwise glabrous. 2-10 small yellow or sometimes white flowers are borne on top of a stalk that reaches up to 45 mm high. Each flower has 4 separate petals that are ca. 4 mm long, 4 separate sepals, and 4 long and 2 short stamens. The glabrous, compressed egg-shaped capsule, or silicle, is 3-8 mm long with a style projecting 0.2-0.7 mm from the tip.
Diagnostic Characteristics: The genus DRABA is composed of a great number of diminutive plants that are difficult to distinguish. Of the mat-forming perennial species, D. GLOBOSA can be distinguished by the combination of having nearly glabrous leaves and glabrous fruits with a style greater than 0.2 mm. A hand lens or microscope and identification manual are essential for determination.
Habitat Comments: Draba globosa occurs in rock pockets, open clay areas, swales, talus, alpine tundra, and meadows (Rollins 1993).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation
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Minimum Criteria for an Occurrence: Any naturally occurring population that is separated by a sufficient distance or barrier from a neighboring population. As a guideline, EOs are separated by either: 1 mile or more across unsuitable habitat or altered and unsuitable areas; or 2 miles or more across apparently suitable habitat not known to be occupied. Justification: The rationale for this large a separation distance across suitable but apparently unoccupied habitat is that it is likely additional research will find this habitat to be occupied. It can often be assumed that apparently unconnected populations will eventually be found to be more closely connected; these are best regarded as suboccurrences. No information on mobility of pollen and propagules is available on which to base the separation distance for this species.
Date: 27Sep2000
Author: Spackman, S., and D. Anderson.
Population/Occurrence Viability
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Excellent Viability: Size: No population size information is available for this species at this time. Condition: The occurrence has an excellent likelihood of long-term viability as evidenced by the presence of multiple age classes and evidence of flowering and fruiting, indicating that the reproductive mechanisms are intact. This occurrence should be in a high-quality site with less than 1% cover of exotic plant species and/or no significant anthropogenic disturbance. Landscape Context: The occurrence is surrounded by an area that is unfragmented and includes the ecological processes needed to sustain this species. Justification: Large populations in high quality sites are presumed to contain a high degree of genetic variability, to have a low susceptibility to the effects of inbreeding depression, and to be relatively resilient. When more information is acquired, the eospecs should be reassessed for this species.
Good Viability: Size: No population size information is available for this species at this time. Condition: The occurrence should have a good likelihood of long-term viability as evidenced by the presence of multiple age classes and evidence of flowering and fruiting, indicating that the reproductive mechanisms are intact. Anthropogenic disturbance within the occurrence is minimal. If exotic species are present, they comprise less than 10% of the total ground cover. Landscape Context: The surrounding landscape should contain the ecological processes needed to sustain the occurrence but may be fragmented and/or impacted by humans.
Fair Viability: Size: No population size information is available for this species at this time. Condition: The occurrence may be less productive than the above situations, but is still viable, with multiple age classes and evidence of flowering and fruiting, indicating that the reproductive mechanisms are intact. The occupied habitat is somewhat degraded (exotic plant species make up between 10-50% of the total ground cover and/or there is a moderate level of anthropogenic disturbance). Landscape Context: There may be significant human disturbance, but the ecological processes needed to sustain the species are still intact.
Poor Viability: Size: Less than 10 individuals. Condition: Little or no evidence of successful reproduction is observed (poor seedling recruitment, no flowering or fruiting observed, or poor age class distribution). Exotic plant species make up greater than 50% of the total ground cover, and/or there is a significant level of human disturbance. Landscape context: The surrounding area is fragmented with many ecological processes no longer intact. The occurrence has a low probability of long-term persistence due to inbreeding depression, natural stochastic events, and its intrinsic vulnerability to human impacts.
Justification: Justification: EOs not meeting "C"-rank criteria are likely to have a very high probability of inbreeding depression and extirpation due to natural stochastic processes and/or occur in degraded habitat with low long-term potential for survival. We estimate that the effects of inbreeding depression would become severe over time in an isolated population of less than 10 individuals, although there is no data available on the population biology of this species or on the sizes of known populations at this time.
Key for Ranking Species Element Occurrences Using the Generic Approach (2008).
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: 27Sep2000
NatureServe Conservation Status Factors Author: Fayette, Kim, rev. B. Heidel (1999), rev. S. Spackman and D. Anderson (2000), rev. A. Tomaino (2009)
Element Ecology & Life History Edition Date: 18Feb2002
Element Ecology & Life History Author(s): MZB, L. OLIVER

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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