|Scientific Name||Anagallis arvensis L.|
|Common Names||English: Red scarlet, scarlet pimpernel; German: Acker-Gauchheil; French: Mouron des champs|
|Description||Annual seed-propagated weed with a thin taproot, opens flowers before rain. A. arvensis was used as a medicinal plant against mental diseases.|
Sessile, opposite leaves.
Cotyledons spatulate, acuminate, smooth-margined, sprinkled underneath.
Prostrate, only slightly ascending, not very ramified, square in cross-section, hairless, up to 15 cm (5.9 inch).
Round oval to broad ovate, deep green, glossy, with dark dots underneath, entire margin, nearly sessile, crosswise opposed or coroniform in groups of three.
Vermilionred, occasionally blue, axillary, long-pedunculate, star-shaped, petals finely dentate, glands ciliate.
Flowers close at night and on cloudy days.
Early summer - autumn.
Capsules papery, 4-6 mm (0.16 - 0.27 inch) in diameter, circumscissile, the style persistent, up to 40 seeds/capsule.
Germination usually in late spring. Seeds are dark brown, ca. 0.8 mm (0.031 inch) long, minutely pitted.
Viability of Seeds
Approx. 100 to 400 seeds per plant.
Roadsides, pastures, waste grounds, disturbed sites. Neutral, friable soils with high pore volume.
A. arvensis prefers neutral, friable soils with high pore volume. It occurs typically in moist soil.
Additional Crop Information
Especially found in spring crops.
Scarlet pimpernell is highly represented in the soil seed bank. Germination occurs over a wide temperature range and in low competition situations (prostrate stem).
The poisonousness of the weed is discussed controversially (Apply caution in silage or feed production!).
Useful non-chemical contribution to Integrated Weed Management
A. arvensis can be easily controlled by mechanical measures and is effectively suppressed by dense crop stands.
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