Brassicaceae seedling

[BubikolRamios]

According to some keys there should be obvious upwards hairs on true leaves surface, no such thing here (only some on leaf edge), original surface attached
http://agrozoo.net/jsp/Galery_one_image ... 8555eae09a

Any opinion ? Edit: red veins looks to me pretty significant.

[Anagallis]

seedling

!=

true leaves

[BubikolRamios]

True, and ?

[Anagallis]

So, if you understand the difference between seedling leaves and mature leaves, why are you looking for characteristics of mature leaves on seedling leaves?

[BubikolRamios]

I see where you are going, various keys declares there are cotyledons, all the rest are true leaves, the one on image first true leaves. Subsequent true leaves can differ.

[Anagallis]

Well, "various keys" is too vague to make productive comments. I assume you're using some seedling key, or what else?

I never had much success with two different printed field weeds keys because they've been written by agriculturists in a very cryptic and confusing way.

[BubikolRamios]

Found a few net keys, just to pick what they were looking at, key wise, at the time. Otherwise in ruins, text does not match images, ...