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Acaena (from Greek word signifying thorn). Rosaceae. New Zealand Bur. Trailing, more or less evergreen plants used in rockwork and as ground cover under trees and between other plants.
About 40 species of sub-shrubs or herbs of the southern hemisphere, allied to Agrimonia and Sanguisorba: lvs. unequally pinnate, alternate, the lfts. toothed or cut: fls. small, crowded in erect terminal spikes or heads; petals none; calyx 5-7-lobed, usually armed with spines; stamens 1-10, or even more: fr. an achene, 1 or 2 being enclosed in the hardened calyx.
Acaenas are little grown in this country, but are prized in England as groundwork for dwarf spring-flowering bulbs, as trilliums; also useful in protecting native orchids and bog plants. Propagation is by cuttings, divisions and seeds.
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