Jankaea

Jankaea is a monotypic genus[3] of flowering plants in the family Gesneriaceae. The only member of this genus, Jankaea heldreichii, is endemic to Mount Olympus in Greece where it is a relict species from the tertiary period.

Jankaea
Jankaea heldreichii flowers and leaves
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Gesneriaceae
Genus: Jankaea
(Boiss.)
Species:
J. heldreichii
Binomial name
Jankaea heldreichii
(Boiss.)[2]
Synonyms

Jancaea heldreichii

Description

Jankaea heldreichii is a small perennial plant with a rosette of ovate basal leaves with entire edges clad in long thick hairs. The flower heads have one to three nodding flowers and are held above the leaves on short stalks. The calyx has five lobes, the violet-coloured corolla has four, or occasionally five, lobes and the fruit is a capsule containing numerous small seeds.[4][5]

Distribution and habitat

Jankaea heldreichii is endemic to the northern and eastern slopes of Mount Olympus in Greece.[1] It typically grows in damp cracks and crevices on limestone rocks on the northern and eastern sides of the mountain,[6] especially near streams. Its altitudinal range is between 400 and 2,400 m (1,300 and 7,900 ft) but it is most common between 700 and 1,400 m (2,300 and 4,600 ft).[1] It is a relict species from the tertiary period; it once had a more widespread distribution but as the climate changed, suitable habitat for the plant dwindled, and it became confined to its present range.[6]

Status

Although restricted to a small area, a study of the phenology of the flowering of this species, its method of pollination and its reproductive success show that it is not seriously endangered at the moment. Several species of bumblebees visit the blooms, but the flowers do not produce any nectar thereby reducing their attractiveness to insects. The main threat faced by the species is the pressure from tourists on Mount Olympus and the uncontrolled collection of the plant, despite the area being in a national park.[5] The International Union for Conservation of Nature has assessed its conservation status as being "near threatened", on the basis that it is not threatened at the moment but its limited population and small range make it vulnerable to habitat disturbance. The plant is protected under the Bern Convention and most of its range is inside the Olympus National Park.[1]

See also

References
  1. Delipetrou, P. (2011). "Jankaea heldreichii". IUCN Red List of Threatened Species. 2011. Retrieved 2 February 2019.CS1 maint: ref=harv (link)
  2. "Jankaea heldreichii (Boiss.)". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew. Retrieved 1 February 2019 – via The Plant List.
  3. "Jankaea". The Plant List. Retrieved 1 February 2019.
  4. "Jankaea heldreichii". Project Noah. Retrieved 1 February 2019.
  5. Vokou, D.; Petanidou, Th.; Bellos, D. (1990). "Pollination ecology and reproductive potential of Jankaea heldreichii (Gesneriaceae); a tertiary relict on Mt Olympus, Greece". Biological Conservation. 52 (2): 125–133. doi:10.1016/0006-3207(90)90121-5.
  6. "Jancaea heldreichii (Boiss.) Boiss". Flora of Greece. Retrieved 1 February 2019.
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