Marrubium velutinum

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Marrubium velutinum
Systematics
Euasterids I
Order : Mint family (Lamiales)
Family : Mint family (Lamiaceae)
Subfamily : Lamioideae
Genre : Marrubium
Type : Marrubium velutinum
Scientific name
Marrubium velutinum
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Marrubium velutinum , illustration

Marrubium velutinum is a plant from the genus horehound ( Marrubium ) in the family of Labiatae (Lamiaceae).

description

Marrubium velutinum is a perennial , herbaceous plant with heights of 10 to 40 cm. The hair consists of yellowish trichomes . The stems are hairy yellowish-tomentose and are simple or have short, blossomless branches. The only up to 15 mm long stalked leaves are 20 to 50 mm long and 20 to 35 mm wide. The leaf blade is broadly ovate to circular and regularly weakly notched-serrate. The upper side of the leaf is quite silky and the underside is covered with white tomentose hairs.

The inflorescence consists of spherical pseudo whorls with many flowers . The bracts are similar to foliage. The prophylls are 9 to 13 mm long, sub-like and star-haired-tomentose. The calyx tube is 4.5 to 6.5 mm long, ten-ribbed and star-haired and tomentose. The five calyx teeth are slightly unequal, 4 to 6.5 mm long and protrude beyond the crown. They are subulate, less than 1 mm wide at the base and bent back. They do not harden in the fruit state. The crown is 8 to 11 mm long, yellow and has star-haired tomentose hair on the outside. The Klausen fruits measure 2.5 × 1.5 mm and are bare.

The flowering period extends from June to August.

The number of chromosomes is 2n = 34.

Occurrence

Marrubium velutinum is endemic to the Pindus , the mountains of central Greece and Panachaiko in the north-western Peloponnese. The plant grows there in dry, rocky and grazed terrain on limestone at an altitude of 1700 to 2400 meters and rarely descends to 1450 meters.

It is also rarely used as an ornamental plant, for example for planting dry stone walls.

Systematics

Marrubium velutinum was first described by James Edward Smith in 1809 . It is one of the species depicted in Flora Graeca .

Individual evidence

  1. ↑ a b Eckehart J. Jäger, Friedrich Ebel, Peter Hanelt, Gerd K. Müller (eds.): Exkursionsflora von Deutschland . Founded by Werner Rothmaler. tape 5 : Herbaceous ornamental and useful plants . Springer, Spektrum Akademischer Verlag, Berlin / Heidelberg 2008, ISBN 978-3-8274-0918-8 , pp. 502 .
  2. ↑ a b c d e f g h i j k Claus Baden: Marrubium L. in: Arne Strid, Kit Tan (ed.): Mountain Flora of Greece. Volume Two . Edinburgh University Press, Edinburgh 1991, ISBN 0-7486-0207-0 , pp. 82–84 ( limited preview in Google Book search).
  3. ↑ a b J. Cullen: Marrubium L. in TG Tutin, VH Heywood, NA Burges, DM Moore, DH Valentine, SM Walters, DA Webb (eds.): Flora Europaea . Volume 3: Diapensiaceae to Myoporaceae . Cambridge University Press, Cambridge 1972, ISBN 0-521-08489-X , pp. 137 (English, limited preview in Google Book search).
  4. ↑ Rafaël Govaerts (Ed.): Marrubium velutinum. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved September 11, 2019.
  5. ^ John Sibthorp, James Edward Smith: Florae Graecae Prodromus. Volume 1, 1809, p. 412 (PDF file).
  6. ↑ John Sibthorp, James Edward Smith: Flora Graeca. Volume 6, 1827, plate 561.