Hypericum triquetrifolium is a perennial rhizome - Geophyt achieved the stature heights from 15 to 55 centimeters. The stem has black glands. The leaves are 15 millimeters large, encompassing half a stem, wavy, heart-shaped at the base and broadly lanceolate. The inflorescence is profuse and pyramidal. Its numerous branches are protruding. The sepals have entire margins, and there are no black glands near their edge.
The flowering period extends from (May) June to October.
The number of chromosomes is 2n = 16.
Hypericum triquetrifolium occurs from the Mediterranean area to western Iran. The species grows on cultivated and fallow land as well as ruderal sites at altitudes from 0 to 900 meters.
- 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. 194 .
- Hypericum triquetrifolium at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- Rafaël Govaerts (Ed.): Hypericum - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on May 14, 2017.