Geranium dissectum

Scientific Name Geranium dissectum L.
Common Names English: Cutleaf geranium, cut-leaved cranesbill, German: Schlitzblättriger Storchschnabel, French: Géranium découpé
Description Annual, mostly summer annual seed-propagated weed with shallow, thin taproot.

Descriptions

Characteristic Features

Deeply clefted leaves, almost circular, flower deep pink to purplish.

Young Plant

Basal leaves long-petiolate, very broad, nearly reniform, somewhat asymmetrical, haired, flattened in front, slightly retracted.

Stems

Erect, ascending, or climbing, covered with backward-pointing, projecting hairs, 10-30 cm (3.93 - 11.81 inch) high.

Leaves

Petiolate, nearly circular in outline, deeply divided (palmatifid) with seven to nine lobes, rough hair on both surfaces, with pointy tips.
Veins impressed above, expressed below.
Apex of the lowest leaves often rounded to subacute, those of the upper leaves acute, carpels becoming black in fruit.

Propagatio Organs

Flowers

Red violet, inflorescences and fruit valves glandularly haired, petals shorter than calyx, filaments compressed and expanded at the base, ciliate, pink apically.

Flowering Period

Late spring - autumn.

Fruit

5-segmented beaklike fruit. Body 2-3 mm (0.078 - 0.118 inch), minutely bristly.
Style column 12-15 mm (0.47 - 0.59 inch).
Beak 2-3 mm ( (0.078 - 0.118 inch).

Seeds

Seeds are deeply pitted, gray-brown. Germination occurs all year round but usually in spring.

Viability Of Seeds

5-10 years.

Propagation

By seeds.
40-150 seeds/plant are dispersed.

Occurrence

Habitat

Arable fields, lawns, grassy open ground, roadsides.

Soil

G. dissectum grows on all soils, but prefers friable, nutrient-rich, loamy, not too chalky soils.

Agricultural Importance

Geranium dissectum often occurrs in small summer annual grains and corn in medium to high densities. The individual plants have low competitive ability. Reduced tillage practices and reduced efficacy of herbicides (mainly in oil seed rape) favor this weed.

Control

Integrated Crop Management

Ploughing suppresses Geranium dissectum.

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