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: Cotyledons spatulate, acuminate, smooth-margined, sprinkled underneath.
Stems: Prostrate, only slightly ascending, not very ramified, square in cross-section, hairless, up to 15 cm (5.9 inch).
Leaves: Round oval to broad ovate, deep green, glossy, with dark dots underneath, entire margin, nearly sessile, crosswise opposed or coroniform in groups of three.
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