This is a preview. Log in through your library . Abstract Petals in Ranunculales are nectariferous organs referred to as "nectary leaves" and show diversity in shape, color and structure due to ...
American Journal of Botany, Vol. 83, No. 4 (Apr., 1996), pp. 419-429 (11 pages) Ultrastructural observations reveal that the spermatozoid of Lycopodium obscurum is crescent shaped and contains two ...
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