Achillea millefolium
The scientific name for the weed Yarrow.
Annual Pearlwort
An annual weed which does not spread like the perennial procumbent pearlwort and is less dense, but with the very fine grass like leaves. It is more common on dry, worn, bare areas and newly sown surfaces. It flowers from May to August, with just 4 green sepals, no petals. there are two sub-species, with their scientific names being, 1. Sagina apetala sub-species erect, and 2. Sagina apetala sub-species apetala.
Aphanes arvensis
The scientific name for the weed Parsley Piert.
Aphanes australis
The scientific name for the weed Slender Parsley Piert.
Armeria maritima
The scientific name for the weed Thrift.
Autumn Hawkbit
A common perennial weed of turf surfaces. Its scientific name is Scorzoneroides autumnalis (formerly Leontodon autumnalis). It spreads by rhizomes and has narrow pinnately lobed leaves, with a reddish mid-rib. It is present on a range of soil types, but not acidic. It flowers from July to November, with them being yellow in colour. This plant is similar to dandelion, but with much finer lobes.
Bellis perennis
The scientific name for the weed Daisy.
Birds-Foot Trefoil
See Common Birds-Foot Trefoil.
Bittercress
A couple of common species of weed which are difficult to distinguish between. One is Wavy Bittercress (Cardamine flexuosa), which is a short-lived perennial, whilst the other is Hairy Bittercress (Cardamine hirsuta), which is an annual or biennial. Both might be found in newly seeded areas or as weeds of lesser maintained amenity surfaces and lawns. They have small pinnate leaves arranged in a rosette pattern. The stem of Wavy Bittercress might be lightly hairy, whilst for Hairy Bittercress it might be hairless, but the with lightly hairy leaf stalks instead. They grow in damp, often shadier
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Black Medick
A common creeping perennial weed of turf surfaces. It has trifoliate leaves, 6mm to 20mm in length, and 6mm to 15mm in width; also having a lightly hairy stem. It prefers calcareous and well drained sandy soils. It flowers from May to September, having small yellow flowers, as well as a black fruit pod. Its scientific name is Medicago lupulina.