Jovibarba

Sempervivum heuffelii

Jovibarba (literally "Jupiter beard", also Donarsbart or Frans Houseleek) is a comprehensive two types section of Houseleeks (Sempervivum ), which differs only slightly except in their floral morphology of the section Sempervivum.

Description

The bell-shaped flowers are sechszählig usually and rarely siebenzählig. Her yellow, light yellow to whitish, erect petals are fringed at the edges slightly. The stamens are yellowish to white.

The base chromosome number is x = 19

Systematics and distribution

In Europe, the species of section Jovibarba are common in the mountains of Central and Southeastern Europe. In Russia, the distribution area extends from the northwest to Central Russia.

The section Jovibarba was erected in 1828 by Augustin- de Candolle Pyrame. The classification of taxa was subject to constant changes that had some homotypic synonyms result.

The section Jovibarba consists of the following species and subspecies:

• Sempervivum globiferum L. ( " Ordinary Frans Houseleek " )

• Sempervivum globiferum subsp. allionii ( Jord. & Fourr. ) 't Hart & B.Bleij ( " Allionis Frans Houseleek " )
• Sempervivum globiferum subsp. arenarium ( WDJKoch ) 't Hart & B.Bleij ( " dwarf Frans Houseleek " or " sand - fringed Houseleek " )
• Sempervivum globiferum subsp. glabrescens ( Sabr. ) M.Werner ( " balding Frans Houseleek " )
• Sempervivum globiferum L. subsp. globiferum ( "sprout end Frans Houseleek " or " Sprossender Donarsbart " )
• Sempervivum globiferum subsp. hirtum (L.) 't Hart & B.Bleij ( " short hair Frans Houseleek " )
• Sempervivum globiferum subsp. lagarinianum ( L.Gallo ) R.Stephenson
• Sempervivum globiferum subsp. preissianum ( Domin ) M.Werner ( " Tatra Frans Houseleek " )

• Sempervivum heuffelii Schott ( "Balkan Frans Houseleek " )

Sempervivum × nixonii Zonneveld is an artificial hybrid between Sempervivum Sempervivum globiferum and heuffelii.

1852 rose Philipp Maximilian Opiz the section in the rank of a genus, which is today but rejected due to the small variations in flower morphology and the phytochemical similarities of many agents. However, there are also the assessment Jovibarba to be regarded as an independent genus and classification handled controversial even in publications.

For hybrids of the genus Sempervivum and Jovibarba beat Gordon Douglas Rowley 1980, the designation × Jovivum ago. With the appearance of the genus in the genus Sempervivum Jovibarba However, this is only a synonym in the genus Sempervivum. Such hybrids could be produced artificially, and of course hardly come before. It has been reported only once from a hybridization between Sempervivum Sempervivum heuffelii and marmoreum. Such hybrids can be in nature probably not last long if they arise again. For cultivation of an artificially created hybrids between Sempervivum is globiferum subsp. Sempervivum montanum and hirtum known that has a low percentage of fertile pollen.