#monotypic genus
- Genus Anemopsis — A monotypic taxonomic genus of perennial herbaceous plants in the family Saururaceae, exclusively represented by the species Anemopsis californica (commonly known as yerba mansa). The plant is native to wet, saline, and alkaline areas of the southwestern United States and northern Mexico, characterized by a unique conical inflorescence surrounded by large white bracts that mimic an anemone flower, and by roots with strong medicinal properties.
- Aphyllanthes — A genus of xerophytic perennial plants within the family Asparagaceae, native to the western Mediterranean region (especially southern France and Spain). It comprises a single recognized species, Aphyllanthes monspeliensis, remarkable for its rigid, thin green stems that resemble rushes or grass, lacking developed leaves, and producing spectacular bright blue flowers at their tips.
- Asteranthera — A monotypic genus of perennial, creeping or climbing (epiphytic) plants in the Gesneriaceae family, uniquely represented by the species Asteranthera ovata; it is native to the temperate rainforests of southern Chile and neighboring regions of Argentina, recognized by large, spectacular tubular bright red flowers with white interior striping, adapted for hummingbird pollination.