foc
《中国植物志》英文修订版
Flora of China
  FOC Vol.8 (2001)              | Family List  Brassicaceae  PDF Megadenia  PDF   |  eFloras.org Link Font:+ Big | - Small
   17. Megadenia  Maximowicz
双果荠属   shuang guo ji shu
  

  

Herbs annual, sometimes perennial from slender, deeply buried rhizomes. Trichomes absent. Stems absent or rarely developed. Basal leaves long petiolate, rosulate, simple, entire or repand, palmately 3-5-veined. Cauline leaves absent, rarely present and similar to basal ones. Racemes absent and all flowers on pedicels from basal rosette, if present then few flowered, bracteate throughout. Fruiting pedicels erect-ascending or divaricate, recurved. Sepals ovate, base of lateral pair not saccate, margin not membranous. Petals white, slightly longer than sepals; blade obovate, oblong-obovate, or spatulate, apex obtuse; claw absent. Stamens 6, subequal; filaments not dilated at base; anthers orbicular, obtuse at apex. Nectar glands 4, 1 on each side of lateral stamen; median glands absent. Ovules 2 per ovary. Fruit indehiscent, schizocarpic, didymous, angustiseptate silicles, sessile; valves (mericarps) transversely ovate or sublenticular, 1-seeded, woody, reticulate, keeled all around; replum rounded; septum complete, thickened, opaque, veinless; style slender, to 0.3 mm; stigma capitate, entire. Seeds wingless, broadly ovate, plump or slightly flattened; seed coat smooth, not mucilaginous when wetted; cotyledons accumbent.

One species: China, Russia.

  
   Lower Taxon
  • Megadenia pygmaea  Maximowicz  双果荠