Flower:

Flowers are in raceme-like branching clusters in the upper part of the plant. Individual flowers typically have no petals. Around the center are 5 carpels (pistil parts) shaped something like a beaker or decanter. They are surrounded by 10 stamens with creamy white tips that turn brown with age. The flowers are typically on only 1 side of the stem, and the clusters tend to fan out.

Leaves and stem:

Leaves are up to 4 inches long and 1¼ inch wide, finely toothed, hairless, with a pointed tip and tapering at the base. There is little or no stalk. The main stem may be sparsely hairy and is sometimes angular.

Fruit:

In late summer the carpels turn red and seed capsules develop, each containing many seeds.

Notes:

Ditch Stonecrop isn't very showy until it fruits, then it can be quite a nice splash of color. Penthorum has been shuffled around various families, at one time in Penthoraceae, then Saxifragaceae, then Crassulaceae, and now is back to Penthoraceae.