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Poaceae, Panicoideae, Paniceae - Bristlegrass (bottlebrush)
(Family, Subfamily, Tribe)
Waves of Grain Index - Grass
Burr Bristlegrass (Trans-pecos Bristlegrass) Setaria adhaerens (Panicum adhaerens, Seteria adhaerans)
I call this "Velcrograss" as it attaches quickly and sounds like Velcro when removed. It is a lawn weed. Spikelets less than 2mm long. Leaves glabrous on the margins.
Photos taken in Taylor County, Texas, July 2007
(Introduced worldwide - Callahan, Runnels)
Yellow Bristlegrass (Cattail Grass) Setaria pumila (Panicum pumilum)
Heavy inflorescence can droop, mature head is yellow. Sheath flattened, keeled, glabrous, purplish at base. Sheathes are close together.
Photos taken in Taylor County, Texas, July & August 2007
(cultivated worldwide, native of Eurasia - Coleman, Brown)
Knotroot Bristlegrass (Marsh Bristlegrass) Setaria parviflora (Setaria geniculata)
Short cone-shaped head, 1"-3" long, green spikelets, tan bristles. Leaves are short and well spaced. Sheath margin has a few hairs. Nodes and sheath top pinkish. Plant grows to about 20" tall.
Photos taken in Taylor County, Texas, July & October 2007
(Native of Texas - not near Taylor)
Base: perennial, short knotted rhizomes, no stolons (runner stem)
Blade (leaf): 6-25mm long, 2-8mm wide, flat, glabrous or sparse hairs at ligule
Sheath (leaf part encircling stem): lower ones keeled, tiny ligule
Culm (main grain stem): erect to leaning, 30-100cm tall can be taller, glabrous nodes
Inflorescence: dense cylinder, 3-8cm long, tiny hairs on axis
Bristles: 4-12 below each spikelet, 5-10mm long, variable color green, yellow, purple
Spikelet: 2.5-3mm long, swollen, pointed apex
Similar Species In My Area
Foxtail Bristlegrass Setaria italica (Panicum italicum)
Long head has brown spikelets and purple bristles, 3"-8" long and 1/2"-2" wide, cylindrical to lobed, nodding. Stout culms are erect, sometimes branched at base. Nodes often flattened and hairy. Leaves 8"-16" long and up to 1 1/4" wide. Sheath overlapping, margins fringed, hairy collar. Cultivated in China before 2500 B.C. Good for erosion control. Good for forage.
(Introduced, native of Eurasia - Coke)
Hooked Bristlegrass (Foxtail Grass) Setaria verticillata
Long head with "velcro" bristles. Bristles turn brown. Leaf is wide at sheath.
Differs from Setaria adhaerens by soft hairs on sheath margin, leaf is not hairy, bigger spikelets (2-2.3mm long)
(Introduced, native of Eurasia - Brown)
Green Bristlegrass (Green Foxtail Grass) Setaria viridis (Setaria italica ssp. viridis, Panicum viride)
Long narrow head, up to 8" long, when long the heads droop near the apex. Dense green seeds with green to purple bristles, lower most are often separated from the rest. Bristles 1-3 per seed, green to purple. Leaves up to 16" long and 1" wide, often hairy and purple at the base. Sheathes have hairy margins. Multiple plants spread from the roots. Plants can grow about 8 feet tall. Often considered a weed.
(Introduced, native of Eurasia - Taylor)
Waves of Grain Index - Grass
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