These two give me a headache! Mainly because there have been huge changes in the taxonomy of petaloid monocots over the past 30+ years, and my first plant identification course went by an outdated system.
So here's a few pointers:
3-merous? Could be either.
Inferior ovary? Always Asparagales.
Spotted, not an Orchid or Iris? Liliales.
Fruit blackened & crusty (Phytomelan crust) ? Asparagales.
Fruit not with Phytomelan? Liliales unless Orchidaceae.
Extrorse dehiscence of anthers? Could be either.
Introrse dehiscence of anthers? Definitely Asparagales.
Nectaries at the base of the tepals or stamens? Liliales
Nectaries on septae of ovary? Asparagales.
Orchid (Asparagales)
Narcissus (Asparagales)
Allium (Asparagales)
Lilium (Liliales)
Phytomelan crust (present in Asparagales, except Orchidaceae)
NOTE THAT THE CAPTION ON THIS IMAGE IS INCORRECT!!
Allium is no longer in the Liliaceae, within the Liliales. Recent genetic data has moved it to the Asparagales, Alliaceae or Asparagaceae.
Photos from these websites:
http://www.botanique.org/IMG/arton24565.jpg
http://www.theflowerexpert.com/media/images/mostpopularflowers/narcissus/narcissus-jonquilla.jpg
http://www.touchofnature.com/Fall%20Pictures/allium_gladiator.jpg
http://www.hillkeep.ca/images/Lilium_speciosum_2004-08-14_019xx.jpg
http://www.oardc.ohio-state.edu/seedid/images/Allium_porrum_2.jpg
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