North America Non-native Plant

Euphrasia Ostenfeldii

Botanical name: Euphrasia ostenfeldii

USDA symbol: EUOS2

Native status: Not native but doesn't reproduce and persist in the wild

Euphrasia ostenfeldii: A Mysterious Member of the Eyebright Family If you’ve stumbled across the name Euphrasia ostenfeldii in your plant research, you’re not alone in wondering what exactly this mysterious species is all about. This little-known member of the eyebright family represents one of those botanical puzzles that keeps plant ...

Euphrasia ostenfeldii: A Mysterious Member of the Eyebright Family

If you’ve stumbled across the name Euphrasia ostenfeldii in your plant research, you’re not alone in wondering what exactly this mysterious species is all about. This little-known member of the eyebright family represents one of those botanical puzzles that keeps plant enthusiasts scratching their heads.

What We Know (And Don’t Know) About This Elusive Plant

Euphrasia ostenfeldii belongs to the fascinating genus Euphrasia, commonly known as eyebrights. These small, often parasitic herbs have captivated botanists for centuries, but this particular species remains something of an enigma in the plant world.

Unfortunately, detailed information about Euphrasia ostenfeldii is remarkably scarce in botanical literature and databases. What we can tell you is that it appears to be associated with northern European regions, particularly Scandinavia, though even this geographic distribution remains unclear.

The Challenge of Growing an Unknown Quantity

Here’s where things get tricky for gardeners. With so little documented information available about this species, recommending it for garden use becomes nearly impossible. We don’t have reliable data on:

  • Its preferred growing conditions
  • USDA hardiness zones
  • Growth habits and mature size
  • Pollinator or wildlife benefits
  • Native status in North America
  • Potential invasiveness

A Word of Caution for Garden Enthusiasts

Given the lack of available information about Euphrasia ostenfeldii, we’d recommend proceeding with extreme caution if you somehow encounter this plant for sale or in seed catalogs. Without understanding its growth habits, environmental needs, or potential impact on local ecosystems, introducing it to your garden could be problematic.

Better Alternatives: Well-Documented Native Eyebrights

Instead of taking a gamble on this mysterious species, consider exploring other members of the Euphrasia genus that are better documented and potentially native to your region. Your local native plant society or extension office can help you identify eyebright species that are appropriate for your area and garden goals.

The Bottom Line

While Euphrasia ostenfeldii might sound intriguing, the lack of reliable growing information makes it a poor choice for most gardeners. Sometimes the most responsible approach is to stick with well-documented plants that we know will thrive in our gardens while supporting local ecosystems. Save the botanical mysteries for the professionals, and focus your garden energy on plants that come with clear growing guides and known benefits.

If you’re passionate about rare or unusual plants, consider connecting with botanical gardens or research institutions that might have more information about this elusive species. Who knows? You might even contribute to expanding our knowledge about this mysterious member of the eyebright family.

Euphrasia Ostenfeldii

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Scrophulariales

Family

Scrophulariaceae Juss. - Figwort family

Genus

Euphrasia L. - eyebright

Species

Euphrasia ostenfeldii (Pugsley) Yeo [excluded]

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA