Dịch - Latinh-English - Atriplex hispaniensis quibusdam videtur nostra esse spinachia.

1) What's an orach?

2) What is this supposed to mean?

Sorry for the delay of my answer. The orach is a plant which was used - and it is still used today in some countries- to make cooked food. I will send you the link to wikipedia. This text is about the confusion some people used to make between this plant and spinach, because their leaves are very similar.
http://en.wikipedia.org/wiki/Atriplex
the plant in this picture is from orach's species but it is not the one described in the latin text

Wow - thanks for the clarification - I was really lost! Now I have one more question: Which word did you translate with the word "represents"? I cannot find that in the original Latin. It looks like "is seen as our spinach" to me.

CC: charisgre

I made some major changes now to make it make sense in English. Is it still correct? Please put your response here under the translation rather than in my in-box. Thanks!

CC: charisgre

it's ok kafetzou, it has the same meaning but is more clear. Thanks.