Crassula Nudicaulis Herrei

Crassula nudicaulis var. herrei, also known as Crassula herrei, is a  succulent plant with a shrubby habit. It can grow up to 10 inches (25 cm) tall. The leaves are green, grey-green to brown, near the apex more or less reddish. They are very thick, usually glabrous, semicircular in cross-section, and can measure up to 1.8 inches (4.5 cm) long.

The flowers are small, greenish, and directed upwards. They appear in spring and sometimes again in late summer.

Source: World of Succulents