Draba macounii - O.E. Schulz
Macoun's Whitlow-grass
Taxonomic Status: Accepted
Related ITIS Name(s): Draba macounii O.E. Schulz (TSN 502130)
Unique Identifier: ELEMENT_GLOBAL.2.148199
Element Code: PDBRA111H0
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
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 macounii
Conservation Status

NatureServe Status

Global Status: G5?
Global Status Last Reviewed: 13Jul2016
Global Status Last Changed: 13Jul2016
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Reasons: This species has a very large range and is common in Canada: AB(S2), BC(S5? - previously S3S4), NT(S4), YT(S3) as of 2016. There are fewer than 20 distinct locations known in Alaska (these range from the AK Peninsula up to the Brooks Range). Additional locations are expected but a fair amount of work in apparently appropriate habitat in Alaska has not turned up many new locations (R. Lipkin, pers. comm. 2006). Similarly, per B. Bennett (2004 element ranking form) there are only about 20 sites known in the Yukon Territory, and these are scattered throughout except in the far southeast.
The species is actively tracked in Alberta and Montana and fewer than 30 occurrences are documented there. The overall population size is unknown as many sites are known only from collections lacking any indication of abundance. This species has a large range, a likelihood that additional sites will be found, and relatively low threat level.

Nation: United States
National Status: NNR
Nation: Canada
National Status: N5? (13Jul2016)

U.S. & Canada State/Province Status
United States Alaska (S3), Colorado (SU), Montana (S2)
Canada Alberta (S2), British Columbia (S3S4), Northwest Territories (SNR), Yukon Territory (S3)

Other Statuses

NatureServe Global Conservation Status Factors

Area of Occupancy: Unknown 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 21 - 300

Number of Occurrences with Good Viability/Integrity: Some to many (13-125)

Overall Threat Impact: Low
Overall Threat Impact Comments: Low threats in Yukon, British Columbia, Alaska. The species reaches the southern limit of its continuous range in northern Montana, and climate change may impact these alpine populations.

Short-term Trend: Relatively Stable (<=10% change)

Long-term Trend: Decline of <30% to increase of 25%

Environmental Specificity: Moderate. Generalist or community with some key requirements scarce.

Other NatureServe Conservation Status Information

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

U.S. & Canada State/Province Distribution
United States AK, CO, MT
Canada AB, BC, NT, YT

Range Map
No map available.

U.S. Distribution by County Help
State County Name (FIPS Code)
MT Flathead (30029), Glacier (30035)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
09 St. Marys (09040001)+, Belly (09040002)+
17 Middle Fork Flathead (17010207)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
General Description: Macoun's Draba is a low perennial herb with a few to many leafless stems that are 1-4 cm high and which arise from leaf rosettes that, in turn, arise from the ends of a simple or branched rootcrown. The broadly lance-shaped leaves are 6-10 mm long and are glabrous to sparsely covered with branched hairs; the leaves have long straight hairs on the entire margins. The stalked flowers are borne at the tops of the stems in a compact inflorescence. Each flower has 4 separate sepals, 4 separate, white petals, and 4 long and 2 short stamens. The style is ca. 0.5 mm long. The glabrous, flattened, broadly elliptic capsules are 4-8 mm long and are borne on ascending or spreading stalks.
Diagnostic Characteristics: There are many similar-appearing species of DRABA in our area. A technical manual and hand lens or microscope are required for positive identification. The relatively broad leaves, compact inflorescence, and wide capsules help separate this species from D. LONCHOCARPA, a more common white-flowered species.
Terrestrial Habitat(s): Alpine, Bare rock/talus/scree, Tundra
Habitat Comments: Moist screes and limestone outcrops, ledges. Tundra. Seepy/saturated alpine areas.
Economic Attributes Not yet assessed
Management Summary Not yet assessed
Population/Occurrence Delineation Not yet assessed
Population/Occurrence Viability
U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
NatureServe Conservation Status Factors Edition Date: 29Sep2006
NatureServe Conservation Status Factors Author: K. Maybury

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).

  • 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., and C. Meacham. 1998a. Unpublished review draft of Floristic Synthesis, 8 Jan. 1998. North Carolina Botanical Garden, Chapel Hill, NC.

  • Mulligan, G. A. 1976. The genus Draba in Canada and Alaska: key and summary. Canadian Journal of Botany 54:1386-1393.

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