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Taxon level Class
Taxon name Liliopsida
Closely related taxa Magnoliopsida Gauravm
Taxon details Liliopsida is considered the scientific name for monocots, but monocots may be called differently based on different taxonomic classification systems. Based on chloroplast DNA sequences, the divergence date between monocots and dicots is estimated to be ~200 million years, with a 40 million years uncertainty. There are ~50000-60000 species of monocots, with the largest family being Orchidaceae (orchids) consisting of ~20000 species. The true grasses (Poaceae) are the most economically important family, with 70% of the crops being cultivated belonging to this family. Wikipedia, Wolfe, WikiPoaceae
Taxon morphology details The following features distinguish monocots from dicots - 1) Three flower parts in each flower (vs 4-5 in dicots) 2) One pore in pollen (vs 3) 3) One cotyledon (vs 2) 4) Vascular bundles in stem scattered (vs concentric circles) 5) Adventitious roots (vs radicle-origin) 6) Parallel venation (vs reticulate)

These broad distinguishing features indeed have some exceptions

Wikipedia Monocots
Species belonging to this taxon Acorus calamus (Sweet Flag, calamus, flagroot, sweet cane, sweet grass, sweetroot, sweet rush), Allium sativum (Cultivated Garlic), Aloe vera (Aloe vera, Medicinal aloe, Burn plant), Alpinia abundiflora, Alpinia allughas (Tara), Alpinia aquatica, Alpinia calcarata (Snap Ginger, Cardamom ginger, Indian ginger), Alpinia roxburghii, Cocos nucifera (Coconut), Curcuma longa (Common Turmeric), Curcuma zedoaria (White turmeric, Zedoary), Cyperus rotundus (Common Nut Sedge, Coco grass, Nutgrass, Purple nutsedge), Cyperus squarrosus, Elettaria cardamomum (Cardamom, Green cardamom), Ensete superbum (Rock banana, Wild plantain), Urginea indica (indian squill), Zingiber officinale (Garden ginger), Zingiber rubens (Bengal Ginger)

Wolfe (Journal) : Wolfe et al (1989),[{{{url}}} Date of the monocot-dicot divergence estimated from chloroplast DNA sequence data], PNAS:86(16):6201. doi=NA

WikiPoaceae (Web): Wikipedia entry on Poaceae, Accessdate=2010-10-12

Wikipedia Monocots (Web): Wikipedia Monocots, Accessdate=2010-10-12