Leontodon graecus
| Leontodon graecus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Herbarium evidence, Natural History Museum, London |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Leontodon graecus | ||||||||||||
| Boiss. & Hero. |
Leontodon graecus is a species from the genus Leontodon, which in older literature was regarded as a subspecies of the frilled dandelion . According to its characteristics, it is close to Leontodon oxylepis from Palestine and Leontodon kotschyi from the Elburs Mountains in Iran.
description
Vegetative characteristics
Leontodon graecus is a perennial stiff-haired herbaceous plant that reaches heights of 12 to 30 centimeters. It forms a long spindle, strong, vertical taproot . The fiber roots are sparse and hairless. The 1–6 stems are erect and more or less club-shaped at the top. The numerous foliage leaves are arranged in a basal rosette, 50–150 × 7–20 mm in size, narrowly inverted lanceolate, gradually narrowing into the short stalk, irregularly dentate and evenly dense on both sides with (3), 4-, 5- and 6 -trimmed star hair. The rays are long, slender, and arranged regularly. The length of the smallest star hairs is 120-160 μm, the medium-sized 200-240 μm, the largest 250-550 μm. Since the star hairs are of different lengths, their rays spread out in several layers and the indument becomes particularly thickly felted. The stem is evenly covered by short star hairs like on the leaves.
The bracts are mostly star-haired over the entire surface like the leaves or additionally with longer, slightly wavy, 2 to 3-column hairs on the back of the bract; rarely small star hairs on the edge and longer ones along the central stripe.
Generative characteristics
Leontodon graecus has medium-sized heads that nod in front of the anthesis . The 12 to 15 millimeter long flower envelope extends to 19 millimeters in the fruit stage. The inner bracts are glabrous or hairy on the median nerves, the outer bracts are densely hairy on the edge with 2-5 star hairs. The yellow flowers are twice as long as the shell and often red-striped underneath. The 15 to 20 millimeter long achenes are all the same shape, drawn together from the middle into a short-haired, rough 5 to 7 millimeter long beak, with short bristly hairs. The dark white pappus is about half as long as the achenes and is made up of two rows of bristles that are densely feathered to the base; those in the outer row are shorter than the inner ones.
The number of chromosomes is 2n = 8.
The flowering period extends from April to July.
distribution
The species occurs in southern Greece, the Peloponnese, central Greece and the Ionian Islands and the West Aegean Islands. It has four isolated occurrences on Chios.
Habitat
It occurs on stony slopes and rocks, in stony lawns with between rocks mostly in black pine and Greek fir forests as well as in the Phrygana.
Synsociology
The species is described by Euboea from the herbaceous layer of forests of the Macedonian oak .
Taxonomy
The species was discovered by Boissier and Heldreich in 1849 in Diagn. P. Orient. ser 1, 11: 39 first described.
literature
- H. Pittoni: Leontodon L. In: S. Pignatti (Ed.): Flora d'Italia. Volume 3, Edagricole, Bologna 1982, ISBN 88-206-2312-9 , pp. 242-248.
- Arne Strid, Kit Tan: Mountain Flora of Greece. Volume 2, Edinburgh University Press, Edinburgh 1991, ISBN 0-7486-0207-0 , pp. 529-530.
Individual evidence
- ^ Arne Strid, Kit Tan: Mountain Flora of Greece. 1991, pp. 530-531.
- ↑ Helga Pittoni: Hairiness and chromosome numbers of star-haired 'Leontodon' clans. In: Phyton. 16, 1974, pp. 165-188.
- ↑ a b c d Kit Tan, Gregoris Iatrou: Endemic Plants of Greece. Gads Forlag, Copenhagen 2001, p. 389.
- ^ Arne Strid, Kit Tan: Mountain Flora of Greece. Edinburgh University Press, Edinburgh 1991, p. 531.
- ↑ Helga Pittoni: Hairiness and chromosome numbers of star-haired 'Leontodon' clans. 1974, pp. 172-173.
- ↑ Helga Pittoni: Hairiness and chromosome numbers of star-haired 'Leontodon' clans. 1974, p. 174.
- ↑ Helga Pittoni: Hairiness and chromosome numbers of star-haired 'Leontodon' clans. 1974, p. 174.
- ^ Arne Strid, Kit Tan: Mountain Flora of Greece. 1991, p. 530.
- ↑ Ladislav Mucina , Panayotis Dimopoulos: New locality of 'Quercus trojana' subsp. 'euboica' (Fagaceae). In: Flora Mediterranea. 10, 2000, pp. 261-264. (PDF)