Anthoxanthum aristatum
Bristlecone sweet vernal grass ( Anthoxanthum aristatum )
The Bristlecone sweet vernal grass ( Anthoxanthum aristatum ) is a species of the genus of Ruchgräser from the Gramineae family.
Description
The Bristlecone sweet vernal grass is an annual, tufted grass growing. The stalks are 6 to 40 centimeters long, branched, slender, smooth and glabrous and form four to five knots. The leaf sheaths are glabrous, the lower rarely hairy, at the opening you will find a bunch of 1 to 2 millimeters long hair. The ligule is a 1.5 to 3 mm long, membranous hem. The leaf blade is 1-6 inches long and 1 to 3 rarely to 5 mm wide. She is flat - spread, hairy or bald scattered on top and rough around the edges.
The density and contracted panicle is 1 to 5 centimeters long and 8-15 mm wide. The broad - lanceolate, 5-9 mm long spikelets dreiblütig and disintegrate at maturity, so all three flowers falling from the glumes together. The two lower flowers are sterile, only the top is fertile. The membranous glumes are mutually very unequal, ovate, pointed, or tapering to a short Grannenspitze, keeled, glabrous only rough on the keel. The lower glume is einnervig and 3 to 4 millimeters long. The top three is annoying and 5-9 millimeters long.
The lemmas of the sterile flowers are oblong, brown, membranous, 3-4 mm long, rounded at the upper end or notched and denticulate. The lower lemma is annoying five with a 4-5 mm long awn, the upper lemma is four annoying with a 6 to 10 millimeters long, geknieten, and rotated at the bottom of awn. The palea is missing. The lemma of fertile floret is five annoying, 1.6 to 2.0 mm long, ovate, entire, smooth, shiny and bald. The palea is einnervig, 1.5 to 1.8 mm long, ovate and narrowly rounded. Are formed from a length of 2.5 to 3.5 millimeter two stamens. Blooms between May and June rarer in the second generation of August to September. The fruit is about 2 millimeters long.
The chromosome number is 2n = 10
Distribution and habitat requirements
The natural range of the Bristlecone sweet vernal grass ranges from Africa (Algeria, Morocco, Tunisia, Azores, Madeira, Canary Islands) on South Western Europe (France to Corsica, Portugal, Spain including the Balearic Islands) and South-Eastern Europe (Albania, Bulgaria, the countries of the former Yugoslavia and Italy with Sardinia) and Asia (Turkey). In northern Europe, North America and Australia, there was naturalized as a neophyte. In northwestern Germany, it happens in places often, and you will find it to Poland and south to Silesia.
One finds the Bristlecone sweet vernal grass in sandy grain fields, along roadsides, on wasteland and waste places. It prefers dry, base- and nitrogen- poor, acidic sandy soils with low organic matter.
System
The genus Anthoxanthum the tribe Aveneae is assigned in the subfamily Pooideae.