Poa trivialis
Rough bluegrass ( Poa trivialis )
The Ordinary bluegrass ( Poa trivialis ) is a plant of the genus bluegrasses ( Poa ). The natural range extends from Western Europe to Japan. In Africa, the Americas and Australia is a neophyte. It is sometimes used to create grass, as it grows well in moist and shady locations.
- 6.1 Literature
- 6.2 Notes and references
Description
Appearance and leaf
The Ordinary bluegrass grows as a perennial herbaceous plant, reaching heights of growth from 20 to 80 inches, rarely to 100 centimeters. It forms, grass - green to yellow, loose clumps. Outside the lowest leaf sheaths grow long, aboveground and leafy Kriechsprossen rooted to the buds. The stalks are usually at the base decumbent and geniculate ascending, have three to five knots and stem internodes round. They are under the panicle usually rough, and die after the maturity of the panicle from early.
The alternate arranged on the stems leaves are divided into leaf sheath and blade. The leaf sheaths are rough, keeled and usually somewhat compressed. The ligule is a membranous Halmblätter the hem, 5 to 10 millimeters long and runs from a point. The leaf sheaths of this renewal sprouts are almost closed up top and provided with a deep longitudinal furrow. The corresponding ligule is about 4 millimeters long. The flat - spread leaf blades are 5-20 cm long and 2-5 mm wide. They are pointed suddenly at the top, hood -shaped and fairly thin. The lower leaf surface is smooth, glabrous and shiny and the leaf surface is often rough.
Inflorescence, flower and fruit
The flowering period extends from June to July. The spikelets are arranged in dense panicles, which are 10 to 25 inches long and spread or contracted. From the main axis going from three to seven, rarely up to eleven side branches. The 3 to 4 mm long spikelets are two to vierblütig and green, but often tinged brown or purple. The glumes are glabrous, membranous, rough on the keel and with whitish edges. The lower glume is einnervig, 2-3 mm long, lanceolate acuminate and seen from the side. The upper glume is three annoying, 2.5 to 3.5 millimeters long, pointed, and broad - lanceolate. The lemmas are five annoying, 2.5 to 3.5 mm long, long - ovate and pointed. The lemmas membranous, have whitish edges and the bottom half of the keel is short haired. The florets are occupied at the base with long woolen hair. The palea are two annoying, 2.2 to 3.3 millimeters long and lanceolate. The keels are covered with very short, pointed bristles, respectively. The dust bags are 1.5 to 2 millimeters long.
The caryopsis is 1.3 to 1.6 millimeters in size.
Ecology
The vegetative propagation is done by rooting stems lying down. The Spelzfrüchte the ordinary bluegrass are equipped with Klebzotten and propagate as velcro fruit.
Occurrence
The natural range of the ordinary bluegrass extends from western Europe to India and Japan. In North and South America, Africa, Australia and New Zealand it was spread by humans.
The ordinary meadow grass grows from the level to the subalpine zone. There it thrives in moist meadows, in gardens as weeds in clover and Lucerne fields, along river, forest and roadsides and in ditches. It prefers to sickerfeuchte wet, nutrient-rich, mild to slightly acidic loam and clay soils. It can withstand long over congestion, but not often desiccating soils.
System
The Ordinary bluegrass is a species in the genus bluegrasses ( Poa ).
There are two subspecies:
- Poa trivialis L. subsp. trivialis
- Poa trivialis subsp. sylvicola ( Guss. ) H.Lindb. f ( Ex.: Poa sylvicola cast. ), with thick stolons thickened
Use
The Ordinary bluegrass is sometimes sown in pastures and lawns, where it thrives in cool, moist and shady locations.
The first mowing or grazing the first successes namely very early, it provides indeed a good feed for the cattle, but brings a number of difficulties in the subsequent use of the land with it: When using the ordinary bluegrass as a forage grass but problems may occur. For instance, the offspring of a new grass there only very meager; this is especially true in hot and dry years, where the Neubewuchs can fail completely. Add to that the increased sensitivity of the ordinary bluegrass against winter cold.