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Answer for the clue "Small genus of Old World herbs usually included in genus Brassica ", 7 letters:
sinapis

Word definitions for sinapis in dictionaries

Wikipedia Word definitions in Wikipedia
Sinapis is a genus of plants in the family Brassicaceae . , five species are recognised by The Plant List : Sinapis alba L. – white mustard Sinapis allionii Jacq. Sinapis arvensis L. Sinapis circinata Desf. Sinapis flexuosa Poir. The leaves are used extensively ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sinapis \Si*na"pis\, n. [L.] (Bot.) A disused generic name for mustard; -- now called Brassica .

Usage examples of sinapis.

Phalaris, manner of bending--Results of the exclusion of light from their tips--Effects transmitted beneath the surface of the ground--Lateral illumination of the tip determines the direction of the curvature of the base--Cotyledons of Avena, curvature of basal part due to the illumination of upper part--Similar results with the hypocotyls of Brassica and Beta--Radicles of Sinapis apheliotropic, due to the sensitiveness of their tips--Concluding remarks and summary of chapter--Means by which circumnutation has been converted into heliotropism or apheliotropism.

In the case of the radicles of Sinapis alba, sensitiveness to light also resides in the tip, which, when laterally illuminated, causes the adjoining part of the root to bend apheliotropically.