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Hypericum chapmanii

P. Adams

Chapman's St. John's-wort

G3Vulnerable Found in 1 roadless area NatureServe Explorer →
G3VulnerableGlobal Rank
MediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.148570
Element CodePDCLU03090
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderMalpighiales
FamilyHypericaceae
GenusHypericum
Other Common Names
Apalachicola St. Johnswort (EN) Apalachicola St. John's-wort (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 Date2020-08-17
Change Date1996-06-21
Edition Date2020-08-17
Edition AuthorsBroaddus, L. rev. C. Annable (1991), rev. J. Beckman (6/96), rev. Frances (2020)
Threat ImpactMedium
Range Extent5000-20,000 square km (about 2000-8000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Hypericum chapmanii is a shrub to small tree that occurs only in the Florida Panhandle. It can be locally abundant, but some of its habitat has been converted to pine plantations. The species is an obligate reseeder that responds well to disturbance, including fire, which reduces vegetative cover. However, if too frequent, the plants wil not reach reproductive maturity and contribute to the next generation.
Range Extent Comments
Hypericum chapmanii occurs on the Florida panhandle in at least 10 counties (Santa Rosa, Okaloosa, Walton, Holmes, Washington, Bay, Calhoun, Gulf, Liberty, Franklin) (Sorrie 2012, USDA PLANTS 2020).
Occurrences Comments
There are over 20 herbarium specimens; this species is likely undercollected (GBIF 2020). It is common in the Northern Florida pine savanna ecoclines, or areas of transition from flatwoods to lowlands (Crandall and Platt 2012).
Threat Impact Comments
Threats to Hypericum chapmanii have not been documented; however, its habitat is threatened by development, logging, and non-native species.
Ecology & Habitat

Habitat

Hypericum chapmanii occurs in forested wetlands including cypress-gum ponds, small lakes, natural depressions, bogs and flatwoods (Flora of North America 2015, Sorrie 2012, Clewell 1985).

Ecology

Hypericum chapmanii is disturbance adapted. With little disturbance, germination is low. After disturbance, including by fire, germination is high. If fire is too often (within 3-5 years), the plants will not have time to reach reproductive maturity (Crandall and Platt 2012).

Reproduction

This species is an obligate reseeder that responds well to disturbance, with increased seed germination.The seeds of Hypericum chapmanii are dispersed by birds and gravity. It is a persistent seed bank species and has a life span of over 10 years and take 3 to 5 years to reach reproductive maturity (Robson 2003 in Crandall and Platt 2012).
Terrestrial Habitats
Forest/WoodlandForest - ConiferForest - MixedForest EdgeWoodland - ConiferWoodland - Mixed
Palustrine Habitats
FORESTED WETLANDBog/fen
Other Nations (1)
United StatesN3
ProvinceRankNative
FloridaS3Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentRestricted - smallModerate - slightHigh (continuing)
1.1 - Housing & urban areasRestricted - smallModerate - slightHigh (continuing)
1.3 - Tourism & recreation areasRestricted - smallModerate - slightHigh (continuing)
2 - Agriculture & aquacultureLarge (31-70%)Serious - slightHigh (continuing)
2.2 - Wood & pulp plantationsLarge (31-70%)Serious - slightHigh (continuing)
2.2.2 - Agro-industry plantationsLarge (31-70%)Serious - slightHigh (continuing)
8 - Invasive & other problematic species, genes & diseasesLarge (31-70%)Moderate - slightHigh (continuing)
8.1 - Invasive non-native/alien species/diseasesLarge (31-70%)Moderate - slightHigh (continuing)
8.1.1 - Unspecified speciesLarge (31-70%)Moderate - slightHigh (continuing)

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Plant Characteristics
DurationPERENNIAL, EVERGREEN
Economic Value (Genus)No
Roadless Areas (1)
Florida (1)
AreaForestAcres
SavannahApalachicola National Forest1,927
References (9)
  1. Clewell, A.F. 1985. Guide to vascular plants of the Florida panhandle. Florida State Univ. Press, Tallahassee, Florida. 605 pp.
  2. Crandall, R.M., and W.J. Platt. 2012. Habitat and fire heterogeneity explain the co-occurrence of congeneric resprouter and reseeder <i>Hypericum</i> spp. along a florida pine savanna ecocline. Plant Ecology, 213(10):1643-1654.
  3. Flora of North America Editorial Committee (FNA). 2015. Flora of North America north of Mexico. Vol. 6. Magnoliophyta: Cucurbitaceae to Droserceae. Oxford University Press, New York. 496 pp + xxiv.
  4. Global Biodiversity Information Facility (GBIF). 2020. GBIF data accessed through GeoCAT portal. Online. Available: http://geocat.kew.org/ (accessed 2020).
  5. 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.
  6. Sorrie, B.A. 2012. Identification, distribution, and habitat of needle-leaved Hypericum (Hypericaceae) in the southeastern United States. Phytoneuron 2012(76): 1–14.
  7. USDA, Natural Resources Conservation Service, PLANTS Database [USDA PLANTS]. http://plants.usda.gov/. Accessed 2015.
  8. USDA, Natural Resources Conservation Service, PLANTS Database [USDA PLANTS]. http://plants.usda.gov/. Accessed 2020.
  9. Weakley, A. 1996. SCS Regional Ecologist, The Nature Conservancy Southeast Regional Office. Electronic mail to L. Morse, The Nature Conservancy, Central Botany. June 8.