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Crataegus uniflora

Muenchh.

Dwarf Hawthorn

G5Secure Found in 2 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.152161
Element CodePDROS0H580
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderRosales
FamilyRosaceae
GenusCrataegus
Other Common Names
dwarf hawthorn (EN) Oneflower Hawthorn (EN)
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.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-12-15
Change Date1984-02-29
Edition Date2023-12-15
Edition AuthorsEberly (2023)
Threat ImpactUnknown
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Rank Reasons
Crataegus uniflora is a shrub or small tree that occurs in the eastern USA from New York, New Jersey, and Pennsylvania south to Florida and west to Texas, with occurrences documented in eastern Mexico. With a large range extent, over 300 occurrences, abundant habitat, and somewhat broad habitat preferences, this species is considered secure.
Range Extent Comments
Crataegus uniflora occurs throughout the southeastern United States and northward to Pennsylvania (Luzerne County), New Jersey, and New York (Staten and Long Islands), and in Mexico in Coahuila and Tamaulipas (Villaseñor 2016). Range extent was estimated using herbarium specimens and NatureServe Network occurrence data collected between 1983 and 2023 (GBIF 2023, NatureServe 2023, SEINet 2023). This species is potentially extirpated from New York State (NatureServe 2023).
Occurrences Comments
By applying a 1 km separation distance to herbarium records and photo-based observations documented between 1992 and 2023, it is estimated that there are over 290 occurrences rangewide (GBIF 2023, NatureServe 2023, SEINet 2023). This species is likely underrepresented in herbaria collections and not all collections are georeferenced, this it is likely that there are over 300 occurrences rangewide. It is notated as common on the coastal plain and piedmont of the southeastern USA (Weakley and Southeastern Flora Team 2023).
Threat Impact Comments
Like most Crataegus, this species is susceptible to blight and fungal rusts which can cause stem cankers and dieback, as well as inhibit seed production. Fungal rusts are especially problematic when the alternate host, Eastern Red Cedar (Juniperus virginiana) (Lance 2014).
Ecology & Habitat

Habitat

This species grows in a variety of xeric or subxeric habitats including rock outcrops, sand barrens, sandhills, woodlands dominated by pines, and roadsides or other disturbed landscapes (FNA 2014, Weakley and Southeastern Flora Team 2023).
Terrestrial Habitats
Woodland - MixedSand/duneBarrensBare rock/talus/scree
Other Nations (1)
United StatesN5
ProvinceRankNative
TennesseeSNRYes
District of ColumbiaSNRYes
New YorkSHYes
OhioS2Yes
MarylandSNRYes
West VirginiaS2Yes
South CarolinaS5Yes
KentuckyS3Yes
PennsylvaniaSNRYes
VirginiaS5Yes
MississippiSNRYes
New JerseyS5Yes
DelawareSUYes
TexasSNRYes
North CarolinaS5Yes
AlabamaSNRYes
FloridaS3Yes
LouisianaS3Yes
MissouriSNRYes
OklahomaSNRYes
ArkansasSNRYes
GeorgiaSNRYes
Threat Assessments
ThreatScopeSeverityTiming
8 - Invasive & other problematic species, genes & diseasesPervasive - largeUnknownHigh (continuing)
8.4 - Problematic species/diseases of unknown originPervasive - largeUnknownHigh (continuing)

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (2)
Virginia (1)
AreaForestAcres
Three SistersGeorge Washington National Forest8,149
West Virginia (1)
AreaForestAcres
Dry River (WV)George Washington National Forest7,331
References (8)
  1. Flora of North America Editorial Committee (FNA). 2023. Flora of North America north of Mexico. Vol. 14. Magnoliophyta: Gentianaceae to Hydroleaceae. Oxford Univ. Press, New York. xxiv + 505 pp.
  2. Global Biodiversity Information Facility (GBIF). 2023. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2023).
  3. 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.
  4. Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.
  5. NatureServe. 2023. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  6. Southwest Environmental Information Network (SEINet). 2023. Collections Databases. Online. Available: https://swbiodiversity.org/seinet/collections/index.php (accessed 2023).
  7. Villaseñor, J.L. 2016. Checklist of the native vascular plants of Mexico. Revista Mexicana de Biodiversidad 87: 559-902.
  8. Weakley, A.S., and Southeastern Flora Team. 2023. Flora of the southeastern United States. Edition of April 14, 2023. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. 2105 pp.