Botanical name: Turritis glabra Family: Brassicaceae (Mustard family)
Synonyms: Arabis glabra, Arabis turritis, Arabis excelsa
Tower mustard, is a 1-4 ft tall, slim, grey-green plant with small creamy flowers at the top of the stem. It usually grows on poor chalky or sandy soils, in open situations. Rosette leaves are 5-15 cm long, 1.5-3.5 cm broad, entire or toothed, stalked to stalkless, hairy, rarely glabrous. Stem leaves are 2-8 cm long, 0.5-3 cm broad, oblong ovate, arrow-shaped, stem-clasping, entire, pointed, somewhat stem-hugging, glaucous, hairless, rarely margin sparsely hairy. Flower-racemes are many flowered, up to 30 cm long in fruit. Flowers are about 5 mm across, pale yellow, turning whitish when dried. Flower-stalks are up to 1 cm long in fruit, erect, subappressed. Sepals are 2-4 mm long. Petals 4-6 mm long, 1.5 mm broad. Stamens are 3, 4 mm long. Seed-pods are linear somewhat terete or sub-quadrangular, 3-9 cm long, about 1.5 mm broad, erect, straight, glabrous, often subappressed, valves with a conspicuous mid-rib; seeds many. Tower Mustard is native to Eurasia. In India it is found in Kashmir. Flowering: May-August.
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The flower labeled Tower Mustard is ...