Pentagramma triangularis, commonly known as goldback fern or gold fern, is a perennial herbaceous fern native to western North America, particularly California. It is typically found in shaded, rocky crevices and north-facing slopes, often in chaparral, oak woodlands, and mixed evergreen forests, from sea level to 8501 feet in elevation. This fern is characterized by its triangular, bright green fronds that can grow 6-12 inches tall. The fronds have a distinctive gold-colored powder on the underside, which is a unique adaptation to deter herbivory and manage light exposure.

Goldback fern is valued for its ornamental foliage, particularly the contrasting colors of the green topside and gold underside of the fronds. It is used in shaded garden areas, rock gardens, and native plant landscapes. It requires minimal maintenance, thriving in part shade to full shade conditions, and prefers well-drained soils. While it is drought-tolerant once established, it benefits from occasional water during prolonged dry periods. There are no major disease problems associated with this fern, but it can be sensitive to overwatering and excessive sunlight. Its historical use by Indigenous tribes for medicinal purposes adds an interesting aspect to its cultivation.CC BY-SA 4.0