Atraphaxis
Atraphaxis billardieri
The buck wheat ( Atraphaxis ) is a genus of about 25 species from the family of the buckwheat family ( Polygonaceae ), which grow as shrubs. The distribution area of the species extends from central and western Asia via southern Russia to the Mediterranean. Some species are used in steppe and rock gardens as ornamental plants.
Description
The buck wheat species grow as deciduous, low and highly branched shrubs with bare, thorny or unbewährten branches. The herbaceous, less than one-year branches bear leaves and flowers. The leaves are arranged opposite one another or rare in tufts. You are almost sessile and have a simple leaf blade. The membranous joint sheaths are clearly designed to have two cores and two shared at the top.
The flowers are hermaphroditic and grow loose or tight in the leaf axils racemose inflorescences at the ends or sides of the branches. The flower stems are thin and broken. The perianth is simple, clearly veined, four - or five-piece and arranged in two circles. The outer bracts are smaller than the inner and clearly beaten back and down to the bottom free. The two to three inner bracts are straight and enclose the fruit. There shall be six to eight stamens. The stamens extend down to the base and unite in a glandular ring. The ovary is upper constant, compressed lenticular or has a triangular cross-section. The two to three pens are short, the scars are positioned capitate. The fruits are 4 mm long, ovate, two - or three -edged, glossy brown nuts with almost wing-like edges.
Dissemination
The approximately 25 species grow in the steppes of Central, Southwest and North Asia and the Mediterranean region in southern Europe and northern Africa.
System
Buck wheat ( Atraphaxis ) is a genus in the family of the buckwheat family ( Polygonaceae ). There she is assigned to the subfamily Polygonoideae the tribe Polygoneae. The genus was first described by Carl Linnaeus in 1753 in his work Species Plantarum.
In Plant List The following types are recognized:
- Atraphaxis angustifolia Jaub. & Spach
- Atraphaxis aucheri Jaub. & Spach
- Atraphaxis Avenia Botsch.
- Atraphaxis badghysi cult.
- Atraphaxis billardieri Jaub. & Spach
- Atraphaxis bracteata Losinsk.
- Atraphaxis canescens Bunge
- Atraphaxis caucasica ( Hoffm. ) Pavlov
- Atraphaxis compacta Ledeb.
- Atraphaxis daghestanica ( Lovelius ) Lovelius
- Atraphaxis decipiens Jaub. & Spach
- Kleinstrauchiger buck wheat ( Atraphaxis frutescens (L.) K.Koch )
- Atraphaxis grandiflora Willd.
- Atraphaxis intricata Mozaff.
- Atraphaxis irtyschensis Chang Y.Yang & Y.L.Han
- Atraphaxis karataviensis Pavlov & Lipsch.
- Atraphaxis kopetdagensis Kovalevsk.
- Atraphaxis laetevirens ( Ledeb. ) Jaub. & Spach
- Atraphaxis macrocarpa Rech.f. & Schiman - Czeika
- Atraphaxis manshurica Kitag.
- Atraphaxis muschketowii Krasn.
- Atraphaxis pungens ( M.Bieb. ) Jaub. & Spach
- Atraphaxis pyrifolia Bunge
- Atraphaxis rodinii Botsch.
- Atraphaxis seravschanica Pavlov
- Thorny buck wheat ( Atraphaxis spinosa L.)
- Atraphaxis suaedifolia Jaub. & Spach
- Atraphaxis teretifolia ( Popov ) Com
- Atraphaxis virgata ( usually ) Krasn.
Use
The species are mostly used only as a lover plants in stone and steppe gardens. They are distinguished by their long-lasting blooms.