POLLEN FLORA OF PAKISTAN–LXXI. ROSACEAE

摘要

Pollen morphology of 50 species representing 17 genera of the family Rosaceae i.e., Alchemilla, Argimonia,Cotoneaster, Crataegus, Duchesnea, Fragaria, Eriybotyra, Filipandula, Geum, Malus, Prunus, Potentilla, Pyrus , Rosa,Sibbaldia, Sorbaria and Sorbus has been studied from Pakistan by light and scanning electron microscope. Pollen grains areusually free, radially symmetrical, isopolar, prolate-spheroidal to subprolate or oblate-spheroidal rarely perprolate,tricolporate rarely tricolpate. Tectum mostly coarsely-finely striate, rarely striate-rugulate, scabrate or spinulose oftenreticulate. Rosaceae is more or less eurypalynous family. Significant variation is found in P/E ratio, shape and exineornamentation and on the basis of these characters family has been divided into seven pollen types viz., Agrimoniaeupatoria–type, Alchemilla ypsilotoma–type, Cotoneaster affinis–type, Fragaria nubicola–type, Geum roylei–type, Maluspumila–type, Potentilla pamirica–type. Pollen data is useful at specific and generic level.