PJB-2009-168
POLLEN MORPHOLOGY OF RARE TAXA LAGGERA ALATA AND ITS RELATED SPECIES PLUCHEA LANCEOLATA OF TRIBE PLUCHEEAE (ASTERACEAE)
AKBAR ALI MEO* AND MIR AJAB KHAN**
Abstract
Pollen morphology of rare taxa Laggera alata and its related species Pluchea lanceolata has been investigated. The pollen grains are trizonocolporate with spines broad at the base with short blunt tip. Aperture is lacunate to non-lacunate in Laggera alata and non-lacunate in Plucheae lanceolata. They are spheroidal in equatorial view and circular to semi-angular in polar view. Distinct columella is of much systematic value; double layered exine with prominent piller like columella is found in Laggera alata of Plucheeae which distinguishes the pollen of this tribe from Inuleae which is characterized by single columellate sexine.
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