This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
Pretty little rock plants for sandy and stony places, and increased by seeds, cuttings, and division. A. balearica is the best for covering stones, with dense masses of small green leaves studded with tiny white flowers. Other kinds are caespitosa, with a golden-leaved form; gothica, grandiflora, laricifolia, montana, norvegica, Rosani, tetraquetra, and verna - all with white flowers. A. purpurascens has purplish blossoms.