Green Alkanet

Green Alkanet - Pentaglottis sempervirens

Description

A bristly plant usually of 30 to 60 cm in height. Stems branched, stem leaves unstalked. Flowers bright blue with a white scaly throat 8 to 10 mm in small long-stalked leafy cymes.

Identification difficulty
Habitat

Damp or shady habitats, woodland margins, hedgebanks and cultivated land.

When to see it

April to July.

Life History

Perennial.

UK Status

Frequent and widespread throughout most of Britain except the extreme north.

VC55 Status

Now common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in just 50 of the 617 tetrads.

Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2025+ | 2020-2024 | pre-2020

UK Map

Additional images

All NatureSpot records

Photo of the association

Agromyza abiens/myosotidis/lithospermi agg.

The larvae of the  Agromyzid flies Agromyza abiens, Agromyza myosotidis and Agromyza lithospermi produce identical mines on the leaves of several food plants in the Boraginaeceae family, such as Borage, Comfrey and Green Alkanet plus a number of other host plants. The initial narrow gallery contains frass in a double line, which it then expands to form a blotch mine. Several larvae may occupy a leaf to form a large blotch. Because the mines on these plants cannot be reliably separated to species level we treat them as an aggregate.