Crowberry-leaved St. John's wort

from Wikipedia, the free encyclopedia
Crowberry-leaved St. John's wort
Hypericum empetrifolium subsp. empetrifolium

Hypericum empetrifolium subsp. empetrifolium

Systematics
Rosids
Eurosiden I
Order : Malpighiales (Malpighiales)
Family : St. John's wort family (Hypericaceae)
Genre : St. John's herbs ( Hypericum )
Type : Crowberry-leaved St. John's wort
Scientific name
Hypericum empetrifolium
Willd.
Hypericum empetrifolium subsp. oliganthum

The crowberry-leaved St. John's wort ( Hypericum empetrifolium ) is a type of plant from the genus of St. John's herbs ( Hypericum ).

features

The crowberry-leaved St. John's wort is a dwarf shrub that reaches heights of 10 to 60 centimeters. The leaves are in three whorls on the stem axes. The sepals are egg-shaped and have black, sessile glands on the edge . There are axillary leaf shoots. The capsule has oblique vesicles.

The flowering period extends from April to August, rarely until October.

The number of chromosomes is 2n = 18.

Hypericum empetrifolium : black glands on the sepals.

Occurrence

The crowberry-leaved St. John's wort is an eastern Mediterranean species. It occurs on the islands of the central and southern Aegean , on the Peloponnese , in eastern central Greece, along the Turkish Aegean coast and in Cyrenaica . The deposits on the Ionian islands of Lefkada , Kephallonia and Zakinthos as well as on the Chalkidike peninsula are already outside the closed area . Isolated sites are in Northern Albania and Northern Cyprus .

The species grows in pine forests, phrygana and crevices on limestone at altitudes from 0 to 2300 meters.

Systematics

The crowberry- leaved St. John's wort belongs to the Coridium section . In addition to the widespread type subspecies, there are two other endemic subspecies on Crete :

  • Hypericum empetrifolium subsp. empetrifolium is a small shrub with upright branches. The leaves are 7 to 11 millimeters long and narrow. The inflorescences are 8 to 40 flowered. The flowers are large. The subspecies grows mostly on lime-poor soils in maquis , phrygana and light forests at altitudes from 0 to 1200 meters.
  • Hypericum empetrifolium subsp. tortuosum (Rech.f.) I. Hagemann is a trellis bush with heavily lignified branches that are pressed against the ground. The leaves are approximated and 2 to 3 millimeters long. The inflorescences are mostly single, rarely up to 4-flowered. The subspecies is endemic to Crete and grows on limestone soils in hedgehog cushion heaths , mountain forests and on sinkholes at altitudes of 1400 to 2300 meters.
  • Hypericum empetrifolium subsp. oliganthum (Rech.f.) I. Hagemann is a pillow-shaped, multi-layered dwarf shrub. The leaves are 4 to 6 millimeters long. The inflorescences are 4 to 7 flowered. The subspecies is endemic to Crete and grows in crevices, phrygana and pine forests at altitudes from 0 to 1450 meters.

supporting documents

  • Isolde Hagemann: On subspecific taxa of Hypericum empetrifolium ( Hypericaceae ) from Crete. In: Plant Systematics and Evolution. Volume 155, No. 1-4, 1987, pp. 165-187, DOI: 10.1007 / BF00936297 .
  • Ralf Jahn, Peter Schönfelder: Excursion flora for Crete . With contributions by Alfred Mayer and Martin Scheuerer. Eugen Ulmer, Stuttgart (Hohenheim) 1995, ISBN 3-8001-3478-0 , p. 193 .

Individual evidence

  1. ↑ Hypericum empetrifolium at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis

Web links

Commons : Crowberry-leaved St. John's Wort ( Hypericum empetrifolium )  - Collection of images, videos and audio files