Portulaca, a low-growing herb. It has fleshy, reddish stems; short, spoon-shaped leaves; and small, five-petaled flowers. The flowers open only in full sunlight. The garden portulaca, or rose moss, is a trailing annual with one-inch (2.5-cm) flowers that may be white, pink, yellow, red, or purple. It is cultivated on dry banks and in borders. Purslane, or pussley, a similar plant with bright-yellow flowers, is considered a weed.
The garden portulaca is Portulaca grandiflora; purslane, P. oleracea. Both belong to the purslane family, Portulacaceae.Portulacas are succulent herbs with showy flowers and conical leaves.