Common Milkwort is a native, perennial, scrambling, patch-forming, low herb, growing up to 30cm.
The small flowers (4-7mm) are purple, blue, pink or white, in short spikes.
Individual flowers have a corollary tube made up of 3 joined petals; an upper entire petal and 2 frilly lower petals. The corollary tube contains 8 stamens.
The flower also has 2 large, coloured, petaloid sepals (like wings) and 3 small green sepals.
Leaves are dark green, slightly fleshy and ribbed.