|Scientific Name||Panicum dichotomiflorum Michx.|
|Common Names||English: Fall panicgrass; German: Gabelblütige Hirse; French: Panic dichotomique; Spanish: Mijo|
|Description||Annual big loosely tufted grass, growing up to 100 cm (39.37 inch) tall.|
Flattened stems. Blanc lower nodes are bigger than the upper ones, occasionally forming roots.
Leaf blades are 1 - 2 cm (0.39 - 0.78 inch) wide, rather rough and sometimes hairy on the upper surface, 10 - 50 cm (3.93 - 19.68 inch) long, the youngest leaves are rolled.
Multiple culms (stems), ascending to erect. Shade of light green, terete, hairless, and largely covered by the sheaths; sometimes they branch and develop secondary culms.
Smooth blade, dull above and glossy below. Hyaline-white and pronounced midrib. Ligule is made up of a dense ring of white hairs, ciliate membrane 1 - 2.5 mm (0.039 - 0.098 inch) long, truncate. No auricles, sheath slightly flattened round or slightly keeled, usually without hair.
Panicle very branched but loose, mostly hidden at the base by a leaf sheath, (10-)30-40 cm (3.93 - 11.81 - 15.75 inch) long. Ears 2-3 mm (0.078 - 0.118 inch) long.
Germination in spring.
Viability of Seeds
Seeds remain viable for 5 - 10 years.
Fall panic grass is widespread in the Mediterranean area and in the Americas. It grows in irrigated or moist places.
P. dichotomiflorum prefers different kinds of soils like fertile, clay or silty loam.
Fall panicum grass has shown some resistance to atrazine, and is one of the most serious grass weeds in the USA. It is most often a problem in reduced or no-till fields whose undisturbed soils favor its germination.
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