Panicum dichotomiflorum

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.

Descriptions

Characteristic Features

Flattened stems. Blanc lower nodes are bigger than the upper ones, occasionally forming roots.

Young Plant

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.

Stems

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.

Leaves

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.

Propagatio Organs

Flowers

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.

Flowering Period

Summer-autumn.

Fruit

Caryopsis.

Seeds

Germination in spring.

Viability Of Seeds

Seeds remain viable for 5 - 10 years.

Propagation

By seeds.

Occurrence

Habitat

Fall panic grass is widespread in the Mediterranean area and in the Americas. It also grows in irrigated or moist places.

Soil

P. dichotomiflorum prefers different kinds of soil like fertile, clay or silty loam.

Agricultural Importance

Fall panic 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 are favorable for germination.

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