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This study examines the exomorphic achene characteristics of 23 taxa belonging to  Centaurea ,  Cyanus ,  Psephellus  and  Rhaponticoides  in Asteraceae using light microscope and scanning electron microscope (SEM). The exomorphic characteristics studied are shape, size, colour and surface pattern of achene, and hair, length and colour of pappus. The results of the present investigation showed that achene size of the studied taxa is 37 × 14 mm. Pappus length is 114 mm, deciduous for three taxa and inner row is differentiated from the outer, 13 mm long, for 10 taxa. SEM studies showed eight different types of achene surface patterns for the studied taxa: Glebulate, glebulate-ruminate, reticulate, ribbed, ruminate, smooth, smooth-glebulate and undulate. Achene characteristics are useful for both intrageneric and intraspecific classification of the studied taxa.  Bangladesh J. Plant Taxon.  22 (2): 125-136, 2015 (December)

bangladesh journal of plant taxonomy

Systematic implications of achene characteristics in genera &lt;i&gt;Centaurea&lt;/i&gt; L., &lt;i&gt;Cyanus&lt;/i&gt; Mill., &lt;i&gt;Psephellus&lt;/i&gt; Cass. and &lt;i&gt;Rhaponticoides&lt;/i&gt; Vaill. (Asteraceae)