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Rapistrum

Genus of flowering plants

Genus of flowering plants

  • Rapistrum perenne (L.) All
  • Rapistrum rugosum (L.) All
  • Arthrolobus Andrz. ex DC.
  • Schrankia Medik.

Rapistrum, the bastard cabbages, is a genus of the family Brassicaceae with a distinctive cross like arrangement of its petals. It is also known as wild-turnip or turnipweed. 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.

Etymology

The word "Rapistrum" is formed from the Latin rapa ("turnip") and -astrum, ("incomplete resemblance").

Fruit

The genus Rapistrum has a characteristic fruit comprising two segments, one distal and one proximal:

  • The distal (upper division) is 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.

  • The proximal (lower division) is 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 between species in the genus. 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.

References

Bibliography

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References

  1. "''Rapistrum'' Crantz". [[Royal Botanic Gardens, Kew]].
  2. {{PLANTS
  3. "Rapistrum".
  4. Warwick, Suzanne I.. "Rapistrum".
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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

brassicaceae brassicaceae-genera plants-described-in-1769
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