Leymus
Beach rye ( Leymus arenarius )
Beach rye ( Leymus ) is a plant genus of the family Gramineae ( Poaceae ).
Features
The representatives of the genus are perennial grasses with rhizomes. The renewal shoots usually grow up outside of the lowest leaf sheaths, rare even within. The leaf sheaths are open at the base, smooth and glabrous. The ligule is a short, membranous hem. The leaf blades are flat or rolled in the bud location, they are rolled. The leaves are blue- green or blue-gray, rough, bare at the bottom, at the top of the nerve rarely hairy.
The inflorescence is a spike. The ears are individually at the top of the stems, and are always thicker than the stem, they form a Gipfelährchen. The ears axis does not disintegrate to maturity. The spikelets are almost sitting and standing to 1-4 (rarely to 7) adjacent to the ears paragraphs axis. Within the glumes they are stalked. They are 10 to 32 mm long, have three to five (rarely seven) flowers, the top mostly male, the rest are hermaphroditic. The spikelets are laterally compressed. The flowers fall to the fruit ripening individually from the glumes out the stop. The glumes are one to five annoying, from narrow - lanceolate to linear- pfriemlicher shape, bald or hairy, without or with short awns. The lemmas are five to seven annoying, of lanceolate shape and have no or a short awn. The palea are two annoying and almost the same length as the lemmas. There are three stamens. The ovary is hairy above.
The caryopses are short hair at the top, and adherent to the deck and palea. The embryo is elliptical, the navel is the form of lines.
The basic chromosome number is x = 14, within the genus there is a Ploidiereihe up to octoploid species ( Leymus arenarius about ).
Dissemination
The genus is distributed worldwide except Africa.
System
The genus Leymus is within the grasses in the subfamily Pooideae and the tribe Triticeae. The genus is closely related to Psathyrostachys. The two classes have the same ancestor, or Leymus emerged from Psathyrostachys. Some species of the two genera are closer together than the other species of its own genus. The question of whether Leymus emerged through Autopolyploidie from Psathyrostachys, or whether it is an allopolyploid clan is unclear.
The data on the number of species vary from 30 to about 40 The GrassBase of Kew Gardens lists the following ways:
- Leymus aemulans
- Leymus ajanensis
- Leymus akmolinensis
- Leymus alaicus
- Leymus altus
- Leymus ambiguus
- Leymus angustus
- Beach rye ( Leymus arenarius )
- Leymus aristiglumis
- Leymus arjinshanicus
- Leymus cappadocicus
- Leymus chinensis
- Leymus cinereus
- Leymus conde satus
- Leymus crassiusculus
- Leymus divaricatus
- Leymus Erianthus
- Leymus flavescens
- Leymus flexilis
- Leymus flexus
- Leymus innovatus
- Leymus karelinii
- Leymus kopetdaghensis
- Leymus lanatus
- Leymus latiglumis
- Leymus mollis
- Leymus multicaulis
- Leymus nikitinii
- Leymus obvipodus
- Leymus ordensis
- Leymus paboanus
- Leymus pacificus
- Leymus pendulus
- Leymus pishanicus
- Leymus pseudoracemosus
- Leymus pubinodis
- Leymus racemosus
- Leymus ramosus
- Leymus ruoqiangensis
- Leymus salinus
- Leymus secalinus
- Leymus shanxiensis
- Leymus tianschanicus
- Leymus triticoides
- Leymus villosissimus
- Leymus yiunensis
The genus name Leymus was formed by the first describer Christian Ferdinand Hochstetter anagrammatically to the genus Elymus, was carved out of Leymus.
Documents
- Siegmund Seybold (ed.): Schmeil Fitschen - interactive ( CD -Rom ), Quelle & Meyer, Wiebelsheim 2001/2002, ISBN 3-494-01327-6