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Rev. Handb. Flora Ceylon Vol. 6: 3-16. New Delhi: Amerind. E. van 1990. Die Gattung Aponogeton (Aponogetonaceae). Aqua-Planta Sonderheft 2. E. van 1991. Neue Erkentnisse tiber die Aponogetonaceae. Aqua-Planta 16: 46-54. D. 1980. See general references. R. 1995. Systematics of subclass Alismatidae: a synthesis of approaches. J. ) Monocotyledons: systematics and evolution, Vol. 2. London: Royal Botanic Gardens, Kew, pp. 353-377. A. 1986. The geographical variation in Aponogeton abyssinicus A. Rich.
The embryo is usually hardly differentiated. g. as in Peltandra and Typhonodorum. In Cryptocoryne ciliata, which grows in freshwater tidal zones, between 20 and 40 cataphylls are formed in the embryo and these probably serve to fix the seed to the substrate, preventing it from being swept away with the tide. Seeds with well-developed plumules, except Cryptocoryne, usually lack endosperm and have only a very thin, papery testa. The testa may be smooth or variously sculptured, thin to thick or occasionally absent (Gymnostachys, Nephthytis, Orontium).
The roots are provided with branched or unbranched root hairs. Articulated laticifers are universally present in leaves and the inflorescence axis but seem to be absent from the rhizome and the roots. Crystals are abundant in the mesophyll of floating leaves as coarse aggregations of rhombohedral types. Tannin is present in isolated cells common next to vascular tissue or in partition cells of the lacunose petiole. INFLORESCENCE STRUCTURE. The inflorescences are borne on long peduncles, which may taper towards the tip (Fig.