| Pak. J. Bot., 39(3): 663-669, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
POLLEN
FLORA OF PAKISTAN–LIII. VERBENACEAE
ANJUM
PERVEEN AND MUHAMMAD QAISER
Abstract:
Pollen
morphology of 13 species representing 9 genera of the family Verbenaceae
from Pakistan has been examined by light and scanning electron
microscope. Pollen grains are usually radially symmetrical, isopolar,
tricolporate or tricolpate, mostly prolate-spheroidal to sub-prolate
rarely oblate-spheroidal, sexine is much thicker or thinner than nexine.
Tectum type varies from subpsilate to reticulate, rugulate-reticulate
often spinulose-reticulate. On the basis of apertures
and exine ornamentation eight distinct pollen types are
recognized viz., Caryopteris grata-type,
Caryopteris odrata-type, Chascanum
marrubifolium-type, Clerodendrum phlomoides -
type, Lantana indica–type, Phyla nodiflora–type
and Verbena officinalis–type.
Department
of Botany, University of Karachi, |
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