Joint flower

Joint flower
	Joint flower ( Physostegia virginiana )
Systematics
	Asterids
	Euasterids I
Order :	Mint family (Lamiales)
Family :	Mint family (Lamiaceae)
Genre :	Physostegia
Type :	Joint flower
Scientific name
	Physostegia virginiana
	( L. ) Benth.

The joint flower ( Physostegia virginiana ) or floor Erika is a species of the genus of the joint Flowers ( Physostegia ) in the family Labiatae (Lamiaceae).

features

The joint flower is a perennial herbaceous plant that reaches heights of 30 to 150 centimeters. It forms a rhizome . The leaves are oblong or lanceolate and serrate . The crown is colored purple, pink, wine red or white. The unusual thing about the flowers of this plant species is that when they open they can be deflected sideways to a certain extent and then remain in the new orientation. Hence the German-language naming.

The flowering period extends from July to September.

The number of chromosomes is 2n = 38.

Joint flower ( Physostegia virginiana )

Occurrence

The joint flower occurs in eastern North America on river banks, in damp bushes and on meadows.

Systematics

Physostegia virginiana was of Linnaeus in Species Plantarum , vol 2, page 594 under the Basionym Dracocephalum virginianum first described . Further synonyms are Dracocephalum speciosum Sweet , Physostegia speciosa ( Sweet ) Sweet and Physostegia virginiana var. Speciosa ( Sweet ) A.Gray .

One can distinguish between two subspecies:

Physostegia virginiana subsp. praemorsa (Shinners) PD Cantino (Syn .: Physostegia praemorsa Shinners ): It occurs from the central and eastern United States to northeast Mexico.
Physostegia virginiana subsp. virginiana : found from Canada to the central and eastern United States.

use

The joint flower is widely used as an ornamental plant for perennial beds and as a cut flower. It needs a sunny to partially shaded, moist location. The species has been in culture since 1683 at the latest. There are several varieties.

literature

Eckehart J. Jäger, Friedrich Ebel, Peter Hanelt, Gerd K. Müller (eds.): Rothmaler excursion flora from Germany. Volume 5: Herbaceous ornamental and useful plants . Spectrum Academic Publishing House, Berlin Heidelberg 2008, ISBN 978-3-8274-0918-8 .

Individual evidence

↑ Physostegia virginiana at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
↑ Carl von Linné: Species Plantarum . tape 2 . Stockholm 1753, p. 594 ( scanned at Biodiversity Heritage Library - Dracocephalum virginianum ).
↑ Physostegia virginiana. In: Tropicos. Missouri Botanical Garden, accessed December 15, 2011 .
^ World Checklist of selected Plant Families. Dracocephalum speciosum . Kew Royal Botanic Gardens, accessed December 15, 2011 (English, as a synonym for Physostegia virginiana Rupr.).
↑ ^a ^b Rafaël Govaerts (ed.): Physostegia virginiana. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved January 5, 2018.

Web links

Commons : Physostegia virginiana - collection of images, videos and audio files

[IPCN-1] Physostegia virginiana at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis

[SpPla-2] Carl von Linné: Species Plantarum . tape 2 . Stockholm 1753, p. 594 ( scanned at Biodiversity Heritage Library - Dracocephalum virginianum ).

[Tropicos-3] Physostegia virginiana. In: Tropicos. Missouri Botanical Garden, accessed December 15, 2011 .

[wchL-4] World Checklist of selected Plant Families. Dracocephalum speciosum . Kew Royal Botanic Gardens, accessed December 15, 2011 (English, as a synonym for Physostegia virginiana Rupr.).

[WCSP-5] Rafaël Govaerts (ed.): Physostegia virginiana. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved January 5, 2018.