Knautia arvensis

Knautia arvensis
Scientific classification
Kingdom:	Plantae
Clade:	Embryophytes
Clade:	Tracheophytes
Clade:	Spermatophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Dipsacales
Family:	Caprifoliaceae
Genus:	Knautia
Species:	K. arvensis
Binomial name
	Knautia arvensis; (L.) Coult.

Knautia arvensis, commonly known as field scabious, is a herbaceous perennial species of flowering plant in the honeysuckle family Caprifoliaceae.

Description

It is a perennial plant that grows between 25 and 100 cm (9.8 and 39.4 in). It prefers grassy places and dry soils, avoiding heavy soils, and flowers between May and August. The flowers are borne on inflorescences in the form of heads; each head contains many small florets. The head is flatter than in similar species, such as devil's bit scabious (Succisa pratensis) and small scabious (Scabiosa columbaria). There are 4 stamens in each floret, and 1 notched long stigma. The fruit is nut like, cylindrical and hairy, 5–6 mm (0.20–0.24 in) in size. It has a tap root. The stem has long stiff hairs angled downwards. The leaves form a basal rosette, are paired on the stem, the lowest typically 300 mm (12 in) long, spear shaped, whereas the upper are smaller. There are no stipules.

Ecology

It is occasionally used by the marsh fritillary as a foodplant instead of its usual foodplant of devils bit scabious (Succisa pratensis).^[1] It is also the foodplant of the narrow-bordered bee hawk-moth (Hemaris tityus).

Name

Species of scabious were used to treat scabies, and many other afflictions of the skin including sores caused by the bubonic plague. The word scabies comes from the Latin word scabere 'scratch'. Another name for this plant is gipsy rose.^[2] The genus Knautia is named after the 17th-century German botanist, Christian Knaut.

Habitat

Commonly found on roadsides and field margins, and in meadows, it is particularly abundant where there is chalk bedrock.^[3]^[4]^[5]

Gallery

with Aphantopus hyperantus
leaves
Young fruit
basal leaf - note that in this species it is lobed, whereas Devils Bit scabious it is not
In Belarus
Field scabious phenology