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VARIATIONS OF CYPSELAS OF FIVE TAXA OF THE TRIBE -VERNONIEAE- (ASTERACEAE)

Journal Name:

  • The International Journal of Pharmaceutical Research and Bio-Science

Publication Year:

  • 2012

Key Words:

Author NameUniversity of Author
Abstract (2. Language): 
Vernonieae is regarded as one of the plesiomorphic tribe of the family Asteraceae, containing of more than 100 genera and 1000 species. Present investigation has been carried out on the morpho-anatomical characters of cypselas of five species of the genus Vernonia Schreb. (V. anthelmintica Willd. V. cinerea (L.) Less. V. galamensis Less., V. hymenolepis A. Rich., Vernonia stenolepis Oliv.) Of the tribe Vernonieae have been studied in details. Combination of both these characters plays a paramount role in isolation of taxa at the species level. Morphological features of the apical part, surface hairs, location of vascular trace, structure of carpopodium and their cellular arrangement, pappus bristles of cypselas are taxonomically significant. Anatomically presence of testal layer in the studied species has an important taxonomic parameter. In V. stenolepis, V. hymenolepis, testal layer made up of thick-walled, parenchyma cells, arranged in 3- 4 layers. except V. anthelmintica, In all the studied species, cellular variations absent in mesocarpic region. Presence of vellicular cavity in V. cinerea, V. anthelmintica, has some taxonomic significance. Secretary duct are important and has some taxonomic value. In V. galamensis, V. stenolepis, cells containing ergastic materials.This character absent in other studied species. In all the studied species; except V. cinerea, testal epidermis addpressed with pericarp. An indented dichotomous key is provided on the basis of macro-morphological and anatomical features of cypselas for identification of species.
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  • 5
420-435
  • English

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IJPRBS
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