Treacle-mustard - Erysimum cheiranthoides
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Species Description
Widespread and fairly frequent in the South becoming more scattered in the North. Habitat includes: Disturbed places such as arable fields, gardens, parks, allotments, churchyards, roadside verges, railway banks, wasteland etc. Growing habit: Annual. Flowers: June to August (may flower any time in milder areas). Height: Up to 1 m. Other names include: Worm-seed Wallflower, Worm-seed Mustard.
Stace 4:
Erysimum cheiranthoides L. - Treacle-mustard.
Usually annual; stems erect, usually branched, to 60(100)cm; lower leaves elliptic, entire to shallowly toothed; petals 3-6mm, yellow, hairy abaxially; (2n=16). Archaeophyte-colonist; cultivated and waste ground; scattered over most of British Isles but rare or local except in Central, East & South England; Europe.
Key:
- Petals ≤1cm; fruits erecto-patent to patent
- Petals 3-6mm; fruits 1-3(5)cm, erecto-patent