Gonialoe variegata (formerly Aloe variegata), is a small, stemless succulent with 18-24 smooth, dark green leaves... Haworthia arista is a compact succulent with dark-green to dark chocolate leaves. Glottiphyllum despressum (Tongue Plant), which is a small succulent, forms densely branched and low-clustering rosettes. Glottiphyllum canum is a compact succulent. It has smooth surfaces and blue-green- to yellow-green foliage. Gasteria batesiana 'Barberton' is a slow-growing succulent with unique, dark green, almost black leaves with rough surfaces.