Cypsela morphology and its significance for the taxonomic delimitation
of the genus Saussurea DC. (s. str.) and its allied genera
Abstract
Cypsela macro and micromorphological features of 28 taxa belonging to 7
genera namely Saussurea DC. s.str., Lipschitziella Kamelin
, Himalaiella Raab-Straube, Dolomiaea DC,
Aucklandia Falconer, Frolovia (DC.) Lipsch. and
Shangwua Yu J. Wang of the tribe Cardueae (Asteraceae) were
studied through light and scanning electron microscope to assess their
taxonomic significance. Various cypsela features like pappus series,
cypsela shape and surface patterns were found most significant
characters for the taxonomic delimitation of Saussurea (s.l.).
The genus Saussurea s.str. was delined from its allied genera by
having biseriate pappus. While, in remaining genera pappus were either
uniseriate or multiseriate and among these genera, Dolomiaea was
characterized due to multiseriate pappus. While, remaining genera such
as, Lipschitziella, Himalaiella, Aucklandia,
Shangwa and Frolovia had uniseriate pappus. Furthermore,
these genera could be delimited on the basis of cypsela shape and
surface patterns. Similar to the generic delimitation, cypsela micro and
macromorphological characters were also found to be useful for specific
delimitation within studied genera. Most of the cypsela morphological
variables when analyzed numerically, also proved the taxonomic
affiliation within all the taxa of the genus Saussurea and its
allied genera. Similarly, these cypsela features could be well
correlated with the gross morphological and molecular decisions at
generic and partially for specific delimitation of Saussurea
(s.l.) from Pakistan and Kashmir.