White rust survey
Looking for and collecting plants infected by the white rust around the world.
Sisymbrium officinale - Hedge Mustard
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Growing form: Annual herb.
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Height: 30–60 cm (12–25 in.). Stem upper half strongly haired, usually short-haired, sometimes glabrous.
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Flower: Corolla regular (actinomorphic), yellow–pale yellow, approx. 0.5 cm (0.2 in.) wide; petals four, 2–4 mm (0.08–0.16 in.) long.; sepals 4; stamens usually 6, of which 4 long and 2 short; gynoecium fused; a single carpel; inflorescence is a raceme, extending in fruiting stage.
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Leaves: Alternate, stalked. Blade pinnately lobed, lobes usually short-haired (sometimes sparsely haired), terminal lobe large, triangular, with hastate base. Upper leaves commonly with only terminal lobe.
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Fruit: Many-seeded pod opening lengthwise, both sides 3-veined, usually hairy (sometimes glabrous), 1–1.5 cm (0.4–0.6 in.) long, pressing against stem. Pod-stalk 1–2 mm (0.04–0.08 in.).
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Habitat: Yards, walls, gardens, beside streets, alleys, roadsides, waste ground, rubbish tips, shores, harbours, sometimes beside tracks, mills.
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Flowering time: July–September.
© Agathe Jouet, PhD student, The Sainsbury Lab, Norwich Research Park, Norwich NR4 7UH, UK.