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Hypericum edisonianum

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Species of flowering plant in the St John's wort family Hypericaceae

Hypericum edisonianum
Conservation status

Imperiled  (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Hypericaceae
Genus: Hypericum
Section: H. sect. Myriandra
Subsection: H. subsect. Ascyrum
Species: H. edisonianum
Binomial name
Hypericum edisonianum
(Small) W.P.Adams & N.Robson
Synonyms
  • Ascyrum edisonianum Small

Hypericum edisonianum, known as Arcadian St. John's wort, Edison's St. John's wort, and Edison ascyrum, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is endemic to Florida.

Description

Arcadian St. John's wort is a small, thicket-forming shrub, growing up to 1.5 meters (4.9 ft) tall. The stems are reddish-brown, marked with lines when young and with bark peeling in strips as it ages. The leathery leaves are sessile and elliptic, growing 15–26 millimeters (5⁄8–1 in) long and 5–11 millimeters (1⁄4–3⁄8 in) across, paler underneath and waxy above. The leaves quickly fall off, leaving behind gland-like auricles. Flowers are produced in a pseudo-dichotomous arrangement. Each yellow flower has 4 sepals: 2 large and 2 small. The flowers each have 4 bright yellow petals and numerous stamens. The capsules have 3-4 lobes.

Hypericum edisonianum is distinguished from the similar H. crux-andreae by its smaller, thicker leaves, its pseudo-dichotomous branching, and a pair of gland-like auricles that remain after leaves fall off the stem.

Distribution and habitat

In Florida, Hypericum edisonianum is restricted to wet prairies, flatwoods, pond margins, and other low areas in the central peninsula, often on sandy soils. It is locally abundant, but only found at 25 sites in 5 conservation areas.

Conservation

Arcadian St. Johns wort is threatened by wetland loss, fire suppression, grazing, and habitat destruction. Conservation efforts to protect this species include securing scrub habitat suitable for its growth, the application of prescribed fire, maintaining natural hydrology, and excluding off-road vehicles and cattle.

References

  1. "Comprehensive Report Species - Hypericum edisonianum". explorer.natureserve.org. NatureServe. Retrieved 2018-10-12.
  2. "Hypericum edisonianum". ipni.org. International Plant Names Index. Retrieved 2018-10-12.
  3. "Hypericum edisonianum". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2018-10-12.
  4. ^ "Hypericum edisonianum - Species Details". Atlas of Florida Plants. Retrieved 2018-10-12.
  5. ^ "Hypericum edisonianum". hypericum.myspecies.info. Retrieved 2018-10-12.
  6. ^ "Edison's ascyrum" (PDF). fnai.org. Florida Natural Areas Inventory. 2000. Retrieved 2018-10-12.
Hypericum
List of species
subg. Hypericum
Adenosepalum
Adenosepalum
Aethiopica
Caprifolia
Huber-morathii
Pubescens
Adenotrias
Androsaemum
Arthrophyllum
Ascyreia
Camplyosporus
Coridium
Crossophyllum
Drosocarpium
Elodeoida
Graveolentia
Hirtella
Platyadenum
Stenadenum
Humifusoideum
Hypericum
Erecta
Hypericum
Hypericum
Senanensia
Monanthema
Oligostema
Olympia
Origanifolia
Roscyna
Sampsonia
Taeniocarpium
Takasagoya
Triadenoides
Monospecific
subg. Brathys
Brathys
Brathys
Phellotes
Spachium
Styphelioides
Elodea
Myriandra
Ascyrum
Brathydium
Centrosperma
Pseudobrathydium
Suturosperma
Thornea
Trigynobrathys
Connatum
Knifa
Paleospecies
Taxon identifiers
Hypericum edisonianum
Ascyrum edisonianum
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