Mouse-eared Hawkweed

Pilosella officinarum

"Pilosella officinarum", known as mouse-ear hawkweed, is a yellow-flowered species of flowering plant in the daisy family Asteraceae, native to Europe and northern Asia. It produces single, lemon-coloured inflorescences. It is an allelopathic plant.
Pilosella officinarum - Mouse-ear hawkweed https://www.jungledragon.com/image/100333/pilosella_officinarum_-_mouse-ear_hawkweed.html Asteraceae,Asterales,Bulgaria,Eudicot,Europe,Flowering Plant,Geotagged,Hieracium pilosella,Magnoliophyta,Mouse-ear hawkweed,Pilosella officinarum,Plantae,Summer,Vitosha Mountain Nature Park,Wildlife

Appearance

It is a hispid perennial plant, with a basal rosette of leaves. The whole plant, with the exception of the flower parts, is covered in glandular hairs, usually whitish, sometimes reddish on the stem.

The rosette leaves are entire, acute to blunt, and range from 1–12 centimetres long and 0.5–2 centimetres broad. Their underside is tomentose.

The flowering stem is generally between 5–50 centimetres tall, and sprouts from the centre of the basal rosette.

The flowerheads are borne singly on the scape and are a pale lemon-yellow colour, with the outermost ligules having a reddish underside. It flowers from May until August and the flowers are visited by various groups of insects, especially flies.
Pilosella officinarum - Mouse-ear hawkweed https://www.jungledragon.com/image/100335/pilosella_officinarum_-_mouse-ear_hawkweed.html Asteraceae,Asterales,Bulgaria,Eudicot,Europe,Flowering Plant,Geotagged,Hieracium pilosella,Magnoliophyta,Mouse-ear hawkweed,Pilosella officinarum,Plantae,Summer,Vitosha Mountain Nature Park,Wildlife

Naming

Shetland mouse-ear hawkweed is similar, but has two flowers per leaf stalk. It is found in the Shetland Islands only, on rocky coastal grassland. It flowers from May to August.
Pilosella officinarum alias Hieracium pilosella at Langeoog Geotagged,Germany,Hieracium pilosella,Langeoog,Mouse-eared Hawkweed,Pilosella officinarum

Habitat

The plant favours dry, sunny areas. It grows well on sandy and similarly less fertile ground types. It produces stolons which generate a new rosette at their extremity, each rosette has the possibility of developing into a new clone forming dense mats in open space. It also propagates by seeds.

References:

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderAsterales
FamilyAsteraceae
GenusPilosella
SpeciesP. officinarum
Photographed in
Bulgaria
Germany