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Mouse-ear cress (Arabidopsis thaliana) foliage is predominantly comprised of a basal rosette.  The rosette is small (2 to 4 inches in diameter) with very pubescent leaves.  Each leaf is slightly serrated, dark green but often with a purple petiole, and somewhat thick and fleshy.

Arabidopsis thaliana habit

Up close you can see the coarse texture of the leaves due to the pubescence.

Arabidopsis thaliana

With a 10x or 16x hand lens, you can see that each hair is stellate (star shaped).  But perhaps a more realistic description would be to say they are the shape of the letter 'Y' (in my opinion).  Nonetheless, this is a fairly unique and identifying characteristic, in that few plants have this type of pubescence.

Arabidopsis thaliana

Cauline foliage (leaves on stems) are small and linear, with more or less complete margins.

Arabidopsis thaliana

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