Danthonia decumbens

Three tooth ( Danthonia decumbens )

The three- tooth ( Danthonia decumbens ) is a plant of the family Gramineae ( Poaceae ). The nominate Danthonia decumbens ssp. decumbens Ordinary Three tooth is called; Moreover, since 1977, is Danthonia decumbens ssp. decipiens - Rasiger Three tooth - regarded as an independent clan.

Description

The subspecies decumbens is 15 to 50 inches high, growing in dense grass and has erect to ascending, strong, stout stalks. The subspecies decipiens is slightly higher, is rather lockerrasig and has petite - slender stalks. The ligule is formed as a lash; the leaf sheaths are ciliated on the edges long. The inflorescence is a loose to a disc Dieting contracted raceme 4-6 cm in length and consists of 4-12 spikelets. These are each 6-12 mm long, are glossy overrun with purple whitish- green and the husks. Each spikelet has two to five flowers. The lemmas are tridentate, whereupon the German name refers.

Ecology

The three- tooth is a perennial, usually dichtrasiger Hemikryptophyt. It forms a VA -mycorrhiza from.

Most flowers open due to lack of erectile tissue not, so they show cleistogamy. There are also individual flowers, which open with the corpora cavernosa, their anthers are 1-2 mm long. Blooms from June to July.

Diaspore ( unit propagation ) which is enclosed by the cover and palea caryopsis, it is boat-shaped and hairy at the base. It is subject to the ants spread and propagates as Regenschwemmling and water Hafter.

Habitat requirements

The three- tooth settled mostly skimmed and semi- arid grassland. It can be found in dwarf shrub heath, Nardus grasslands, fresh meadows and pastures. More rarely it grows in damp meadows. The subspecies decipiens preferred base- rich, calcareous sites.