Morphological and anatomical studies in helobiae

III. Vascular anatomy of the node and flower of Najadaceae
  • V. Singh


In the present investigation vascular anatomy of the node and flower of three species ofNajas—N. graminea, N. flexilis, andN. guadalupensis—have been studied. The leaves are one-traced in all the three species. InN. graminea although both the staminate and pistillate flowers appear to be subtended by the lowermost leaf of a node but the behaviour of vascular tissue shows that they are terminal on a branch system.

The male and female flowers ofNajas are represented by a single stamen and pistil respectively and are enclosed in a bottle-shaped spathe. InN. graminea the staminate flower is nacked. The vascular supply of gynoecium consists of a single bundle which gives off a very small dorsal trace inN. flexilis before entering the base of the solitary ovule which is described as basal. It appears that the so-called basal ovule inNajas too as in many other cases is a derived one. The presence of two stigmas gives some indication towards the pseudomonomerous and bicarpellary nature of the gynoecium.


Main Axis Female Flower Vascular Supply Vascular Anatomy Staminate Flower 
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Copyright information

© Indian Academy of Sciences 1965

Authors and Affiliations

  • V. Singh
    • 1
  1. 1.School of Plant MorphologyMeerut CollegeMeerut

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