Hakea

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Hakea
Ball-shaped pincushion (Hakea laurina)

Ball-shaped pincushion ( Hakea laurina )

Systematics
Subdivision : Seed plants (Spermatophytina)
Class : Bedecktsamer (Magnoliopsida)
Eudicotyledons
Order : Silver tree-like (Proteales)
Family : Silver tree family (Proteaceae)
Genre : Hakea
Scientific name
Hakea
Schrad. & JCWendl.

Hakea is a genus of plants withinthe silver tree family (Proteaceae). The common name pincushion is also used for some species. The 150or so species are found only in Australia and the greatest biodiversity can be found in southern Western Australia .

description

Hakea species grow as shrubs or smaller trees . The young twigs may be covered with two-armed trichomes . This hair is partly permanent, but it can also quickly become bald. The leaves are arranged in a spiral on the branch and are sessile, sometimes growing around the branch or with a tapering base that resembles a petiole. They are simple or composed, flat or round leaves, sometimes grooved lengthways with a serrated or entire leaf margin. Both leaf sides are designed similarly, the venature is distinct or unclear.

The inflorescences are in some species in a cone of bracts , they are usually axillary, rarely they arise from the older wood or are terminal. They are umbel-shaped grapes or short spindles with a few flowers, only rarely are there many-flowered inflorescences in long spindles. The stalked flowers are usually paired, straight or curved in the bud. The sepals are separated up to the base or are fused together and only separated at the tip. Under the ovary there is usually a semicircular or curved-lobed gland, which is rarely missing. The pistil is hairless, the bicameral ovary is stalked or almost sessile. The pollen presentation is upright, oblique or sideways, circular or conical with a narrow or wide edge.

The fruits are modified follicles , which can be lignified to different degrees, often beaked , sometimes horned, mostly jumping open with a delay. The flaps split the fruit completely or partially on one or two sides. The seeds take up the space of the entire valve or are slightly adjacent to one side, are flattened on one side and have a distal wing or wing that encircles the seed and clamps between the valves.

Systematics

The genus Hakea was established in 1797 by Heinrich Adolph Schrader and Johann Christoph Wendland in Sertum Hannoveranum , 27. Type species is Hakea glabra Schrad. & JCWendl., Today a synonym of Hakea teretifolia (Salisb.) Britten subsp. teretifolia . The generic name Hakea honors Baron Christian Ludewig von Hake , who as head of the Hanoverian Oberhofbau- und Gartendepartement was a supporter of science and in particular of the Herrenhausen Gardens .

Hakea amplexicaulis
Hakea bucculenta
Hakea corymbosa
Hakea drupacea
Hakea myrtoides
Hakea pachyphylla
Hakea petiolaris
Hakea purpurea
Hakea scoparia
Hakea teretifolia
Hakea trineura
Hakea ulicina
Hakea Victoria

There are around 150 Hakea species (German trivial names from Zander 2008):

swell

Individual evidence

  1. ^ A b Walter Erhardt , Erich Götz, Nils Bödeker, Siegmund Seybold: The great pikeperch. Encyclopedia of Plant Names . Volume 2. Verlag Eugen Ulmer, Stuttgart 2008, ISBN 978-3-8001-5406-7 .
  2. ↑ a b c d R. M. Barker, L. Haegi, WR Barker: Hakea . In: ABRS Flora of Australia Online. last accessed on April 29, 2013.
  3. ↑ Hakea at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed April 29, 2013.
  4. ↑ Entry at GRIN.
  5. ↑ List of names applied to Hakea species

Web links

Commons : Hakea  - album with pictures, videos and audio files