Loasa arnottiana
NameLoasa arnottiana
Scientific NameLoasa arnottiana
Common NamesOrtiga Brava
Plant FamilyLoasaceae
Natural HabitatNative to central and southern Chile, growing in disturbed areas, roadsides, open woodlands, and scrublands, often in rocky or sandy soils.
Parts Usedwhole_plant
Medicinal Actionsanalgesic,anti-inflammatory
Traditional UsesTraditionally, some Loasa species, including L. arnottiana, have been used externally as a counter-irritant. The stinging hairs are applied to the skin to alleviate rheumatic pain, arthritis, and muscle aches by creating a localized inflammatory response.
Active Constituentsflavonoids, tannins, saponins, silica
Preparation Methodspoultice,infusion
Contraindications & WarningsDirect skin contact causes irritation, redness, and pain due to stinging hairs; handle with gloves. Avoid use on sensitive skin or open wounds. Internal use is not traditionally recommended due to lack of safety data and potential irritation.
Cultivation NotesPrefers well-drained soil and full sun to partial shade. Can be grown from seed. Requires careful handling with protective gloves due to its stinging hairs.
Raritycommon
Description
Loasa arnottiana is a herbaceous plant native to Chile, characterized by stinging hairs covering its stems and lobed leaves. It produces distinctive white or yellowish flowers with intricate nectary scales and often red markings in the center.
