A revision of the New Zealand, Subantarctic, and South American species of Cotula, Section Leptinella

Summary The taxonomic position, status, and characters of Cotula , and its subdivision into three sections are briefly described. Section Leptinella is considered a well‐defined taxon and its characters and relationships are discussed. Twenty‐five species from New Zealand, the Subantarctic islands, and South America are described and classified into two series, Elongata and Radiata . The following new taxa and names are described: series Oligoleima (from Australia and New Guinea), Elongata and Radiata ; five new species, C. dispersa, C. serrulata, C. calcarea, C. intermedia , and C. nana; two new names, C. albida and C. membranacea ; five new combinations, C. rotundata, C. traillii subsp. pulchella, C. pectinata subsp. villosa, C. pectinata subsp. willcoxii , and C. pyrethrifolia var. linearifolia ; four new subspecies, C. dispersa subsp. rupestris, C. dioica subsp. monoica, C. squalida subsp. mediana , and C. atrata subsp. luteola .