Not to be semantically confused with : Water Hyacinth (Eichhornia crassipes) [a plant with similar common name] nor with Pyrenean Squill (Scilla lilio-hyacinthus)[a plant with similar scientific name]

Some similarities to 3 other (non-native) Grape-hyacinths:

• Garden Grape-Hyacinth (Muscari armeniacum) very similar, but the lower fertile flowers are 3.5-5.5mm and bright-blue (a colour like the bright-blue of the upper infertile flowers on Grape-hyacinth)
• Compact Grape-hyacinth (Muscari botryoides) Slightly shorter stems to 25cm with leaves up to 20cm long but conspicuously broadening at the tip. The racemes are densely populated and between 1cm to 6cm long. The lower fertile flowers are 2.5 - 5mm long and 2.5-4mm wide, bright-blue (rather than deep dull-blue) but the 6 lobes are white. It is a persistent garden plantwhich spreads where tossed out.
• Tassel Hyacinth (Muscari comosum) which is up to 60cm high with a much longer flower spike which is much more open with the flowers on much longer petioles (stalks). Moreover, the upper flowers [sterile] are bright blue-purple whilst the lower [fertile] flowers turn dark straw-coloured, grow longer petioles and longer flowers and droop down under their own increased size and weight, like a tassel. The fertile flowers are 5-10mm long and 3-5mm wide. It's leaves are also much longer (40cm) and wider (2cm).

Muscari neglectum is toxic and contains a spread of HomoIsoflavones (30, 62, 80, 104-107) in the bulbs as well as a Scillascillin-type HomoIsoFlavone which has an unusual oxygenation pattern in the B-ring (55).

HOMO-ISO-FLAVONOIDS HomoIsoFlavones contain a Chroman-4-one structure (the two fused 6-membered rings on the left, one unsaturated, the one on the right saturated and with an =O side-group attached at the top). These first four are not that different to the next three: just draw an extra bond on the lower three between the same point on the chromen-4-one as where the bridge across to the rightmost moiety joins to the point on the benzene moiety on the right below that where the bridge joins that. When you have done that, you will get the same 4-membered ring (a cycloButane ring) as the top 4 molecules. Your Author regrets that he does not know the names of these compounds. Even the suffix is not a part of its name (it is just a number in a research paper showing which plant produces which compound). Three more HomoIsoFlavones based upon chromen-4-one. There are a great many other HomoIsoFlavonoids fiffering only in their side-groups which are to be found in almost all genera of the Asparagaceae family, but these are the 7 reported to be in Grape-Hyacinth (Muscari neglectum) species. See Glory-in-the-Snow for some others.