Helianthemum

Bald ordinary Rockrose ( Helianthemum nummularium subsp. Glabrum )

The plant genus of the rock rose ( Helianthemum ) belongs to the Zistrosengewächsen ( Cistaceae ). It includes about 175 species that are common in the Mediterranean.

Name

The German common name comes from the property of the flowers, to align with the sun. The bright yellow flowers, or the preference for sunny places may have contributed to it.

The botanical name is derived from the Greek words helios for sun and anthemos for flowering from.

Description

Helianthemum species are evergreen to semi-evergreen, semi- shrubs. The against-constant leaves are simple.

The hermaphroditic, flowers are radial symmetry fünfzählig. The five free petals are most commonly yellow, but there are also species in the colors purple, pink, red, scarlet and white. Most many stamens are present. The ovary is upper constant. Are formed capsule fruits.

Ecology

The flowers close up in the dark and wet, and are open only at temperatures above 20 ° C. You are nektarlos but provide protein-rich pollen. The petals have a strong UV reflection and are therefore visible to bees.

The leaves are colored in winter snow-free locations bright red due to the accumulation of anthocyanins ( dyes) which are formed from the assimilates when the temperatures for the conversion into starch are no longer enough.

Types (selection)

  • Helianthemum aegyptiacum ( L.) Mill; the species occurs in southern Europe, North Africa and West Asia
  • Alpine Rock-rose ( Helianthemum alpestre ( Jacq. ) DC, Syn. Helianthemum oelandicum subsp alpestre ( Jacq. ) Breistr. . )
  • Apennine Rockrose ( Helianthemum apenninum ( L.) Mill )
  • Helianthemum asperum Lag ex Dunal; endemic to Spain
  • Helianthemum canariense ( Jacq. ) Pers.
  • Grey Rockrose or Graufilziges Rockrose ( Helianthemum canum (L.) Baumg. )
  • Cats head - Rockrose ( Helianthemum caput- felis Boiss. ); the species occurs in Spain, the Balearic Islands, Sardinia, Algeria and Morocco
  • Helianthemum cinereum ( Cav. ) Pers.; the species occurs in North Africa, Spain, Italy and Sicily
  • Helianthemum confertum Dunal
  • Helianthemum crassifolium pers.; the species occurs in North Africa
  • Saffron Yellow Rockrose ( Helianthemum croceum ( Desf. ) Pers. ); the species occurs in the Mediterranean region
  • Helianthemum ellipticum ( Desf. ) Pers.; the species is endemic to Tunisia, Algeria and Morocco
  • Helianthemum eriocephalum Pomel; an endemic of Algeria
  • Helianthemum geniorum Maire; an endemic of Algeria
  • Helianthemum getulum Pomel; the type occurs only in North Africa
  • Helianthemum hirtum ( L.) Mill
  • Helianthemum hymettium Boiss. & Heldr. ; the species occurs only in Greece and Crete
  • Helianthemum kahiricum Delile; the type occurs only in the Middle East and North Africa
  • Helianthemum ledifolium ( L.) Mill; the species is found in North Africa, the Canary Islands, in southern Europe and west to Central Asia before
  • Helianthemum leptophyllum Dunal; the species is found only in Spain, Italy and Morocco
  • Mondfleckiges Rockrose ( Helianthemum lunulatum ( All. ) DC. ); the type occurs only in Italy
  • Katzengamander Rock-rose ( Helianthemum marifolium ( L.) Mill ); the species occurs only in Portugal, Spain and France
  • Helianthemum morisianum Bertol. ; the species is endemic to Sardinia
  • Yellow Rockrose or ordinary Rockrose ( Helianthemum nummularium ( L.) Mill ), with about eight subspecies: Helianthemum nummularium subsp. berteroanum ( Bertol. ) Breistr. ( Syn: Helianthemum berteroanum Bertol. )
  • Bald ordinary Rockrose ( Helianthemum nummularium subsp glabrum ( WDJKoch ) Wilczek ( syn.. Helianthemum nitidum Clementi, Helianthemum serpyllifolium million )
  • Two-toned ordinary Rockrose ( Helianthemum nummularium ( L.) Mill subsp. Nummularium )
  • Großblütiges ordinary Rockrose ( Helianthemum grandiflorum subsp nummularium ( Scop. ) Schinz & Thell s.str, Syn: .. . Helianthemum grandiflorum ( Scop. ) DC, Helianthemum ovatum ( viv ) Dunal subsp grandiflorum ( Scop. ) Hayek.. )
  • Down the ordinary Green Rockrose or Eiblatt Rock-rose ( Helianthemum nummularium subsp obscurum ( Čelakovský ) Holub, Syn. Helianthemum ovatum ( viv ) Dunal )
  • Helianthemum nummularium subsp. pyrenaicum ( Janch. ) Hegi
  • Helianthemum nummularium subsp. semiglabrum ( Badaro ) M.Proctor
  • Helianthemum nummularium subsp. tomentosum ( Scop. ) Schinz & Thell. ( Syn: Helianthemum tomentosum ( Scop. ) Gray )
Gerrit Smith Miller Ovary (botany) Werner Greuter
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