Leontodon hellenicus
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Leontodon hellenicus is a species of dandelion ( Leontodon ) within the sunflower family (Asteraceae).
description
Vegetative characteristics
Leontodon hellenicus is a perennial herbaceous plant that reaches heights of about 8 centimeters. It forms a vertical tap root . The only or a few stems are erect.
The numerous leaves are arranged in a basal rosette. The leaf blade is 15 to 55 millimeters long and 3 to 15 millimeters wide, spatulate; it is almost entire or dentate.
The above-ground parts of the plant are stiffly hairy. The leaves are evenly dense on both sides with short stalked mostly six-pointed (more rarely four-, five- to nine-pointed) star hairs. The star hairs of Leontodon hellenicus have four to six or more horizontal rays that are longer than the stem of the hair. Star hairs pretty much the same height among each other: 200 to 250 to 295 μm; Rays spread out horizontally, 315 to 410 μm long. The indument looks gray-felted because the rays of the star hairs overlap a little. Star hairs of the same shape on the stem as on the leaves, but somewhat more irregular. The bracts are with small, irregular star hairs on the edges of the outer and long, (two-) to mostly four-rayed star hairs on the median of all bracts.
Generative characteristics
The flowering period extends from April to July. Leontodon hellenicus has single, cup-shaped inflorescences that nod in front of the anthesis . The involucrum is 10 to 13 millimeters long, the linear-lanceolate 12 to 15 millimeters long bloom cover are in several rows and are arranged almost like scales.
The pappus , which is not exactly white , is made up of two rows of hairs made up of toothed bristles rather than feathery bristles (the branches are shorter than 0.1 millimeters); those in the outer row are shorter than those in the inner row.
The number of chromosomes is 2n = 8.
Occurrence
This endemic occurs only east of the Gulf of Arta on the mountains Chelidon and Kalliakouda in Evrytanya in Greece.
Leontodon hellenicus thrives on stony slopes and limestone cliffs at altitudes of 1750 to 2000 meters.
Taxonomy
The first description of Leontodon hellenicus was in 1966 by Demetrios Phitos in the Austrian Botanical Journal , Volume 113, p. 272. It is placed in the family group of Leontodon incanus . Leontodon hellenicus is a species of the genus Leontodon , which is close to the group around Leontodon incanus according to its characteristics .
literature
- Arne Strid, Kit Tan: Mountain Flora of Greece. Edinburgh University Press, Edinburgh, 1991, pp. 530-531.
Individual evidence
- ↑ a b c d e f g h Arne Strid, Kit Tan: Mountain Flora of Greece. Edinburgh University Press, Edinburgh, 1991 pp. 530-531.
- ↑ a b c d Helga Pittoni: Hairiness and chromosome numbers of star-haired Leontodon clans. In: Phyton , Volume 16, 1974, p. 172.
- ↑ Helga Pittoni: Hairiness and chromosome numbers of star-haired Leontodon clans. In: Phyton , Volume 16, 1974, p. 183.
- ↑ Helga Pittoni: Hairiness and chromosome numbers of star-haired Leontodon clans. In: Phyton , Volume 16, 1974, p. 185.
