Grevilleen

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Grevilleen
Grevillea juniperina

Grevillea juniperina

Systematics
Eudicotyledons
Order : Silver tree-like (Proteales)
Family : Silver tree family (Proteaceae)
Subfamily : Grevilleoideae
Tribe : Grevilleeae
Genre : Grevilleen
Scientific name
Grevillea
R.Br. ex Knight

The Grevillea or silver ( Grevillea ) are a genus of plants within the silver tree family (Proteaceae).

description

Grevillea species grow as evergreen , mostly upright or creeping shrubs , some species also as trees , with heights of between 0.5 and 35 meters, depending on the species. The leaves are sessile or stalked, depending on the species. The leaf blades are simple, smooth or toothed, or divided with up to three levels of division. The leaf margin is flat or bent back. There is pinnate and reticular or parallel nerve.

The hermaphrodite flowers are also stalked or sessile, depending on the species. They are usually in pairs with a common bract , arranged in multiple inflorescences . The perianth is usually zygomorphic with bent-back ends, sometimes also regular with upright ends. There are usually four, three rare bloom present, the separate on flowering, so the stylus to release end. The bracts are smooth or hairy on both sides. The anthers sit directly on the bracts. The nectar glands are whole or ring-shaped, rarely absent or four-fold. The ovary is bald or hairy. The sessile or stalked Upper constant ovary contains only two ovules . The disc-shaped or conical stigma is upright or oblique to the side of the style.

The bald or hairy fruits are usually follicles or, more rarely (for example in Grevillea candicans ) an achenes and contain only one or two seeds. Depending on the species, they stay on the plant for a long time or fall off early. The pericarp is often hard-shelled. The mostly flat ellipsoidal, rarely hemispherical seeds are winged or wingless.

distribution

The Grevillea species are native to Australia , New Guinea , New Caledonia and the Indonesian island of Sulawesi . Almost all species are native to Australia. Only five species are found in areas outside of Australia: Grevillea exul , Greviileea gillvayi and Grevillea meisneri are native to New Caledonia. Grevillea elbertii and Grevillea papuana are native to Sulawesi and New Guinea. Two other species, Grevillea baileyana and Grevillea glauca , occur in New Guinea and Queensland , Australia .

Systematics

The first description from 1809 in Joseph Knight : On the cultivation of the plants belonging to the natural order of Proteeae. P. 120 uses the notation "Grevillia". Type species is Grevillea aspleniifolia R.Br. ex Knight. The homonym Grevillea LC Beck & Emmons was published in 1826 in the American Journal of Science, and Arts , Volume 11, Plate 1. The generic name Grevillea honors Charles Francis Greville (1749-1809), a member of the Royal Society and the Linnean Society of London .

The genus Grevillea includes around 360 species. Here is a relatively arbitrary list of species of the genus Grevillea :

Grevillea aquifolium
Grevillea aspleniifolia
Grevillea banksii
Grevillea baueri
Grevillea bipinnatifida
Grevillea candelabroides
Grevillea dielsiana
Grevillea fililoba
Grevillea flexuosa
Grevillea jephcottii
Grevillea lanigera
Grevillea leptopoda
Grevillea longistyla
Grevillea petrophiloides
Grevillea rivularis
Grevillea rosmarinifolia
Grevillea triloba
Grevillea vestita
Grevillea wilsonii
Grevillea robusta
Grevillea robusta

Hybrid:

The following species described in this genus are currently assigned to other genera:

use

Greville flowers were popular with the Aborigines for their sweet nectar. It was shaken on the hand for immediate consumption or placed in a vessel called Coolamon with a little water for a sweet drink.

Many species of Grevillea are grown as ornamental plants because of their showy leaves and flowers; many hybrids have arisen in culture.

swell

Individual evidence

  1. ↑ a b c Walter Erhardt , Erich Götz, Nils Bödeker, Siegmund Seybold: The great pikeperch. Encyclopedia of Plant Names. Volume 2: Types and Varieties. Eugen Ulmer, Stuttgart (Hohenheim) 2008, ISBN 978-3-8001-5406-7 .
  2. ^ Grevillea at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed June 10, 2013.
  3. ↑ supplemented with further data from GRIN Taxonomy for Plants ; both accessed on May 2, 2007.

Web links

Commons : Grevilleen ( Grevillea )  - album with pictures, videos and audio files