Banksien

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Banksien
Banksia blechnifolia

Banksia blechnifolia

Systematics
Class : Bedecktsamer (Magnoliopsida)
Eudicotyledons
Order : Silver tree-like (Proteales)
Family : Silver tree family (Proteaceae)
Subfamily : Grevilleoideae
Genre : Banksien
Scientific name
Banksia
Lf
Distribution in Australia
Banksia cuneata
Banksia ericifolia
Banksia integrifolia var. Integrifolia
Banksia menziesii
Banksia nobilis
Banksia spinulosa , 'Honeypots'

The banksias ( Banksia ) are a plant genus within the proteaceae (Proteaceae). The generic name honors the botanist Joseph Banks .

distribution

Their occurrence is limited to the Australian continent , including Tasmania , with 80 species occurring there. The exception is Banksia dentata , which is found in northern Australia and islands north of it, including New Guinea and the Aru Islands .

description

Banksia species grow as evergreen shrubs and trees . The evergreen foliage leaves, which are arranged alternately to sometimes whorled , are leathery and petiolate. The leaf blade is simply to deeply divided. In most cases they have a silvery-gray underside of the leaves and the upper side is dark green. Some species are heterophyll , so there are different leaves. There are no stipules .

The inflorescences of the genus are composed of hundreds to thousands of individual flowers, the color varies between yellow and red. The narrow bracts are usually hairy and often fall off during the flowering period. A large bract stands under pairs of flowers. The individual flowers sit over a bract. The hermaphrodite flowers are fourfold. There are only four more or less identical bracts . There is a discus. There is only one circle with four fertile stamens; they are free from one another and are all the same or more or less clearly different. In each flower there is only one upper carpel , which is sometimes incompletely closed. It contains two ovules . The pollination is done by insects, birds or small marsupials.

The hard, wooden seed heads of many Banksia species only open when it is very hot, such as a bush fire . The winged seeds fall out and are carried away by the wind. The woody follicles contain one or two seeds. The seeds have two wings.

Systematics

The genus Banksia includes 76 to over 90 species, here is a list divided into subgenera and sections according to Alex S. George 1981:

photos

Saw-Banksie ( Banksia serrata ):

  • inflorescence

  • Habit, leaves and fruit cluster

  • Habit, leaves and fruit clusters

  • Infructescence with open fruits after fire

  • Infructescence with open fruits after fire

See also

swell

  • Alexander Segger George: Banksia in the Flora of Australia Online . With identification key.
  • HR Coleman: Banksia in the Western Australian Flora Online , 2008.
  • Walter Erhardt among others: The big pikeperch. Encyclopedia of Plant Names . Volume 2. Verlag Eugen Ulmer, Stuttgart 2008. ISBN 978-3-8001-5406-7

Individual evidence

  1. ↑ Alexander Segger George: The genus Banksia Lf (Proteaceae) , in Nuytsia 3 (3), 1981, pp. 239-473. ISSN  0085-4417

Web links

Commons : Banksien ( Banksia )  - album containing pictures, videos and audio files