more photos of this rare species
All the pictures above are edited from originals kindly sent to me by  the Top End Native Plant Society.
Citrus gracilis appears to me to be very clearly a member of the plant species  Microcitrus,  recently botanically re-classified and absorbed into the true Citrus family. The leaf and twig form is very similar to other Australian native citrus, especially Citrus glauca (Desert Lime) and Citrus australis (Round Lime).
page created 19 October 2004, edited 15th february 2009
Long, linear leaves with a central ridge are similar to (micro)Citrus australis seedlings. Grey-green young twigs resemble Citrus glauca. It seems that, like C. australis, leaves become wider as the plant matures.  Here are linear and more willow-like leaves.
A young tree growing amongst much plant debris and, right,  a mature specimen.

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More photos & information  on this species still welcome, particularly pictures of flowers and fruit.
Does anyone have any seeds?
Please email me!
Citrus gracilis mature tree 2
Citrus gracilis mature tree 3
Citrus gracilis mature tree 1
A small sucker emerging from the side of a large termite mound

From the owner of a new website identifying  Wildflowers of the Darwin Region of northern Australia, comes this picture of a Citrus gracilis twig and flower.
This is the first photograph of the flower I have seen, and almost certainly the only one currently on the internet.
Citrus gracilis flower
Click on the picture for a larger, higher definition version.

Citrus gracilis twigs
Citrus gracilis cuttings
And just to prove I'm not the only person interested in Citrus gracilis, these photos are from a researcher at Melbourne University. Paul Coats is attempting to propagate the species from cuttings. These are just some of the 250 cuttings he has potted using different hormone treatments.