The name "gith" has been applied to Nigella sativa, a.k.a. black cumin - an herb which according to folklore has hypertensive, carminative and antihelminthic properties.

"Gith" has also been used to refer to corn cockle (Agrostemma githago).

It looks like it's related to Love In A Mist.

It is called Agrostemma githago, the common corn-cockle (also written "corncockle" and "corn cockle" and known locally simply as "the corncockle"), is a slender pink flower of European wheat fields.

Here is a link that might be useful: Wikipedia

This is why herbalists (and plant lovers!) really need to use botanical names whenever possible. This confusion can happen too often. If you are interested in using herbs, please get comfortable with the latin binomials. It is important.

A search of PFAF for "gith" only brought up the link below.

FataMorgana

Here is a link that might be useful: PFAF Database