What is "mouse-ear cress"

Mouse-ear \Mouse"-ear`\, n. (Bot.)

1. The forget-me-not ( Myosotis palustris) and other species of the same genus.

2. A European species of hawkweed ( Hieracium Pilosella).

   Mouse-ear chickweed, a name of two common species of chickweed ( Cerastium vulgarium, and Cerastium viscosum).

   Mouse-ear cress, a low cruciferous herb ( Sisymbrium Thaliana). All these are low herbs with soft, oval, or obovate leaves, whence the name.

n. a small invasive self-pollinating weed with small white flowers; much studied by plant geneticists; the first higher plant whose complete genome sequence was described [syn: Arabidopsis thaliana]