| 词条 | Rapistrum |
| 释义 |
| image = Bolletjesraket 19-05-2006 12.28.38.JPG | image_caption = Rapistrum rugosum | taxon = Rapistrum | authority = Crantz | subdivision_ranks = Species | subdivision =Rapistrum rugosum (L.) All Rapistrum perenne (L.) All }} Rapistrum, the bastardcabbages,[1] is a genus belonging to the family Brassicaceae with a distinctive cross like arrangement of its petals. Species of Rapistrum are annual to perennials (Lifespan from 1 to 2 or more years). The yellow petals are accompanied by sepals that stand vertically at near right angles (erecto-patent). Leaf shape and arrangement varies from rough toothed (dentate) to a configuration of opposingly lobed pairs along the plant stalk, pinnately lobed. FruitThe genus Rapistrum has a characteristic fruit comprising two segments: a) The distal (upper division) The part of the fruit farthest away from the point of attachment. The distal is endowed with a ribbed spheroid base (globose) that tapers to form a narrowed projection. It holds a single seed. b) The proximal (lower division) The part of the fruit nearest to the point of attachment. Possesses a more uniform narrower shape compared to the distal above, giving the fruit a waist. It holds a maximum of three seeds, more commonly none or one. The fruit varies from species to species. The distal of R. rugosum is strongly ribbed and narrows to form a beak whereas R. perenne is comparatively less wrinkled and ends with a style that stubbornly resists detachment, 'a persistent style'. When ripe the distal breaks away in an across-wise fashion, breaking transversely. References1. ^{{PLANTS|id=RAPIS|taxon=Rapistrum|accessdate=18 October 2015}}
2 : Brassiceae|Brassicaceae genera |
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